Massdrop THX AAA 789 Headphone Amplifier Review

A thorough review of the limited release balanced headphone amplifier from Massdrop and THX.
Buy the THX 789 here: massdrop.7eer.net/n5MMX
Shortcuts:
00:00 Introduction
01:29 THX AAA Technology
03:56 Connectivity & Features (close-ups of the amp)
07:00 Power supply & build quality
09:43 Specifications
15:30 Balanced vs Single-Ended
17:32 Sound Quality
20:03 Comparison with Burson Audio Fun w V6 Vivid
21:45 Comparison with Bottlehead Mainline
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#audiophile #audioreview #headphoneamp

[@natthapatsotthisopha4350]

Thank you for such an informative review. Although this review is longer than the other review that lasts 24 minutes, it is packed with information that helped me learn something new and make a decision to buy this amp! Keep up the good work! Cheers

[@Willymaze]

Thanks for your review, super honest right away and very knowledgeable without the extra ethereal descriptions of the sound. Nice that you recommend this amp without pretension of cost difference or audiophile level. Your review made me pull the trigger, I've been listening Josh Valour praise this product over the Jotunheim and other amps for a while now, but you explained it succinctly enough. Subscribed!

[@PassionforSound]

Thanks Willy! It's a great amp - I hope you enjoy it!!

[@xeniavader]

One of the best reviews I've watched, thanks !!!!

[@random-internet-dude]

Damn that's a fantastic review if i ever see one. Very helpful and informative. It has that professionalism feeling all over it, great job! With consistent content i can easily see this channel going big. I wish Massdrop stuff was easier to get here in EU, i'll stick with Topping for the best bang for my buck. But this unit looks like an easy buy indeed.

[@random-internet-dude]

@@PassionforSound Hey, their DACs are great (D10, D30, D50) for the price. The new all-in-one DX3 pro has been well received and measured well, it had a "clicking" issues at first but i believe they fixed it with a firmware update. If somehow you could get your hands on this unit for a review i'm sure many people would be interested.

[@bananajoe275]

A bit late but for EU SMSL SP200 looks similar good. www.audiophonics.fr/en/sedentary-headphone-amplifier/smsl-sp200-balanced-headphone-amplifier-thx-aaa-888-2x-3w-32-ohm-black-p-14170.html

[@dmarcus1260]

This is by far my favorite review of the THX AAA 789 Headphone Amplifier. You deserve way more subs!

[@PassionforSound]

Thanks dmarcus!!

[@dmax-ux6sn]

Good job Lachlan! Good to see you doing these youtube videos! Maybe I should come over to listen to this amp! Thanks!

[@joeydee716]

One of the best reviews and explanations ever!! Bravo!

[@PassionforSound]

Thanks Joey!

[@stw1549]

Great review and explanation, thanks for the work and making this!!

[@PassionforSound]

No problems, Stephen. Thank you!

[@stanpiper8158]

I had to pull my Codex out of service and began to research for another rig. I found your channel and subbed. You are a gifted reviewer. Cut to the chase, I bought the amp and RME ADI - 2 DAC. They match up very nicely and provide a lot of flexibility and a very pleasing sound. The 789 is such an amazing and well-thought out amp for the price that i just love owning it. The sound is good, because the amp is super quiet and just gets out of the way and lets the RME rock. And the RME is another story. Nice review.

[@PassionforSound]

Thanks Stan. I'm actually in the process of arranging a review of the RME thanks to one of the channel's patrons.

[@AlvaroAvalos]

Such a great review, instantly subscribed!

[@PassionforSound]

Thanks Alvaro! Glad you liked it!

[@ralphfurley123]

Excellent review!!! I love your presentation for its professionalism and great detail!!! I had to subscribe because of it!!! Please continue the great work!!! ☮️🖖🏽

[@PassionforSound]

Thanks so much, Ralph! I'm glad you found the review helpful. I've got 3 more in the pipeline right now. I hope they'll be equally as enjoyable.

[@ralphfurley123]

Passion for Sound that’s great news!!! I look forward to watching more audio reviews from your channel!!! Take care!!! ☮️🖖🏽

[@sergiov4434]

Hello Lachlan, love your videos! This is an awesome review and can't wait for more content. I have subbed, keep up the good work. If you could answer a THX AAA 789 question I'd really appreciate it. Does the amp support multiple outputs simultaneously? If you connect 2 headphones using the SE terminations, do both play sound? What about balanced + SE? Thanks in advance.

[@zenguitar65]

Excellent review. This is one of the few reviews that breaks down the barrier of comprehension of the product, the technology and it's application to the end user. Just wanted to ask you if this review was sponsored in any way? Once again Kudos for your production value and thoroughness. You've gained another subscriber!

[@PassionforSound]

Thanks Stephen! None of my reviews are sponsored and the 789 was purchased by me at full retail from Drop. They didn't even know who I was :) (and maybe still don't)

[@zenguitar65]

@@PassionforSound Keep on keepin' on. Your presentation style is exactly what the KZbin community needs.

[@arthurwatts1680]

Thanks for the video. We fully expect to have electricity and indoor plumbing here in Darwin any day now and I look forward to hearing these toys for myself ;)

[@arthurwatts1680]

@@PassionforSound Its a double-edged sword - crocs love running water too.

[@Richbroth]

Excellent and informative review btw

[@johnwilliamson6442]

Interesting review which I found because MassDrop have put this amp out again. I have recently been playing with Bluetooth headphones (new Yamaha YH-L700A and older B&W P700 wireless). Really nice when Bluetooth’d to various sources but I set them up by wire to my OPPO 205. As a reference I pulled out my old (1995) Sennheiser HD580 phones. The HD580s pretty much cleaned them up despite the 3D tricks of the Yamaha unit. I used to use the 580s with a Burson HA160D (which was also preamping to Cary 300SE tube amps) when the Cary’s went so did the Burson so the Sennheisers went into the bottom drawer for years. Now my interest in headphone listening has been relit. I have watched/read reviews recently about the RME ADI2 DAC which is praised for its headphone stage. It can also do some room-tuning for my speaker system. As I am also considering to upgrade my Chord 2Qute to the Qutest, I now (at a stretch) could go to the Hugo TT2 and utilise it’s headphone stage. Am now in a multi-variate decision dilemma. Any comment you could make about the headphone performance of these three amps without reference to price?

[@PassionforSound]

Hi John, the TT2 is clearly the superior product in every aspect. The DAC is vastly superior to the ADI-2 and better than the Qutest too. The ADI-2 sounds a bit artificial and edgy compared to the much more natural/realistic and 3-dimensional sound from the Qutest or TT2. The ADI-2's amp stage is also only ok. It's about on par with the THX 789, but can't match the TT2 or even other affordable amps like the Singxer SA-1. In short, if you can stretch to the TT2, do it! If not, I'd recommend the 2Qute or Qutest (I haven't heard the 2Qute) and a nice amp - it will be a much better overall experience I believe.

[@petrolhead007]

Listening to the THX AAA 789 for the first time this morning. While connecting it to my audio gear I was thinking whether I would be able to hear any difference. I've already got very good quality gear including amps and DACs. Connected my PC with the Chord Hugo 2 and then that with the THX using the SE input connection. Plugged the Sennheiser HD800S in the THX's 4 pin XLR balanced output. Started with King Crimson's Moonchild. As soon as the track began I first felt surprised and then happy - a big smile on my face :) After that Peter Gabriel, The Clash, The Doors, Radiohead, R.E.M., The Smiths, Pink Floyd.....I don't want to stop listening now. Hard to believe that they've created such a brilliant headphone amplifier at such an affordable price point. I haven't tested the amp with my other headphones yet, but at least for the HD800S I think that I've found the optimum setup. Thinking of buying another amplifier as a backup when the drop returns.

[@PassionforSound]

Great news, Petrol Head! It's fantastic to hear that it can do justice to the Hugo 2. Thanks for sharing!

[@Farpun]

Just found this channel this is great!

[@Ali_ReBORN]

Subscribed! Keep the great content coming mate :)

[@PassionforSound]

Thanks Ali!!!

[@AdamDuffArt]

I love your reviews and rely on them with regards to my own purchases If I can make a suggestion, the volume of the music you add to these reviews is shockingly loud compared to your spoken voice I have to increase the volume to hear you, then the music kicks in and I jump out of my seat A minor niggle but otherwise a big thank you for your hard work and sharing your expertise

[@PassionforSound]

Hi Adam, glad the reviews are helpful! I've learner a lot along the way about my editing processes and you'll find that the audio is much better balanced in my recent videos. Just for the sake of interest, I used to volume match the music and my voice, but the compression used on music made it seem louder even though the peak levels are the same. It's what TV commercials do to get our attention too, but it's not what I wanted in my video so I've compensated for it in recent times (i.e. last 6-12 months I think)

[@marion3525]

Outstanding review!

[@PassionforSound]

Thank you, Marion!

[@jonnymodena]

I have to say, Lachlan, you gave one fantastic review. I am shocked that I am your 255th subscriber. Uncanny how things work. But i suspect that number is and will be growing quickly. On with my comment... Thank you for your opinion and the abundance of spec related information. I had already decided on purchasing this amplifier to pair with my Hifiman HE-400i, Senn 58x, etc. I have fallen flat on my face for the Hifiman planar sound and will more than likely be moving on the the HE-1000v2 in the future. I like to analyze the sound presented by my music so coloration isnt favored by me, which is why i was drawn to this amp. Adding in the completely affordable price point sealed the deal for me.

[@stivk1937]

I’ve just got into headphone hifi with a pair of hd6xx and he400i headphones. Since the drop has ended for this amp do you have any recommendations on what amp/dac combo I should be looking at buying with a budget up to $1000 That would give me similar performance and sound? By the way great review, your follower numbers deserve an extra few 000 attached to the end.

[@scottpeterson2840]

Love your reviews! Thoughts on the focal clear?

[@irun2sanaxox]

I like your style 😌, good stuff man

[@irun2sanaxox]

Lachlan Fennen no probs 😌, I can’t wait to get into the audiophile world one day

[@marcob.7801]

Superb Review my friend! Detailed yet concise considering all the info discussed. many Thanks and Kudos! Please keep them coming. Would LOVE to hear your review on an OPPO BDP105D, even though it is an older, out of production piece of kit. BTW, I intend to utilize the XXX789 with said OPPO as I have a massive CD library which, If time permits (66 years young), I shall put onto some sort of hi def SSD storage device.

[@marcob.7801]

Any particular piece of hardware that you'd recommend Lachlan??

[@PassionforSound]

Hi Marco, I've only just seen these comments / questions. For some reason I didn't get notifications for them - my apologies! Are you still looking for that hardware recommendation?

[@ryanchenoweth5673]

Great review mate! 👏👏👏 Just wondering how much you paid with postage to Australia?

[@bradulovic82]

First time viewer here, awesome review, subbed.

[@andersforsgren3806]

First time for me also, good presentation and you got the specs in the description - that's very nice.

[@dmarcus1260]

The THX AAA 789 made me realize my primary headphone amp, the Headroom Ultra Desktop Amp, colors the sound to a certain degree. The HUDA soundstage is wider, the treble has more sparkle, midrange is slightly more forward and the bass has more slam. It’s like the HUDA takes everything the THX AAA 789 does to the next level and then some. The THX AAA 789 is a great headphone amp especially for the price. Currently I am using the Topping D70 as the DAC for the THX AAA 789. I can’t wait to buy the Topping D90 DAC to compare it to the D70.

[@PassionforSound]

It's an interesting when it comes to amps that incredible distortion figures don't always equate to the ultimate in sound. For example, the SMSL SP200 uses the same THX technology, implemented differently and yet, due to the other components in the signal path, it doesn't sound the same as the 789. Better capacitors, resistors, signal path design, etc. can all lead to distinctly different sound quality in my experience. Glad you're enjoying the HUDA and the D70!

[@mpalen19]

Great review. I'm very interested in trying it out. Any idea how this would compare with the Schiit Jotunheim?

[@beepover]

Possibly the best reviewer on youtube.

[@PassionforSound]

Thanks so much!

[@wallfire23]

This is such a great review.

[@PassionforSound]

Thanks Rayna!

[@raynaritchie1224]

I'm going to be pairing it with a Brooklyn DAC+ fed over Balanced-ish XLRs. This sounds noticeably better than Brooklyn's internal headamp stage when used stand-alone.

[@PassionforSound]

I don't know the Brooklyn gear, but I'm not surprised to hear that the 789 outperforms the inboard amp. There are almost always limitations in all-in-one designs (with a rare few exceptions).

[@gullibleskeptic3237]

Im using this with a topping e30 to power my hd600(with eq from Oluvs gadgets) and this gives me some of the cleanest, most transparant, non fatiguing sound i ever heard out of a headphone. Female vocals are always important for me and these sound incredible. In single ended im still on gain 2 even with a pre gain of -8 in equalizer apo so it has more then enough power even in single ended.

[@PassionforSound]

Glad you're enjoying your setup, Hanzo! There's no doubt that it's a very clean sound.

[@edwardbit8225]

a great review,like the comparison to tube amps thx amps are great.....

[@PassionforSound]

Thanks Edward. Some of the THX gear is brilliant. A few (like the SP200) not so much 🙂

[@davidmthekidd]

Loved the review. I'm currently running my Hifiman Ananda's from a Schiit Magni 3, and I've been considering a Lyr3 or this amp, any thoughts?

[@davidmthekidd]

@@PassionforSound I noticed that this amp has a cousin called the Monoprice Monolith Desktop THX amp/dac. Any thoughts how it might differ?

[@aogle]

Lachlan, thanks for the excellent review. I have a Mayflower O2/ODAC in my desktop setup together with the Massdrop x HIFIMAN HE4XX, and use the Cambridge Audio DacMagic XS to drive my Beyerdynamic DT 770 PRO (250 Ohm) elsewhere. You compared the THX AAA 789 to the 02 (18:15) and I would be interested in hearing more about how the O2 would compare with other similar amp/DACs.

[@PassionforSound]

Hi Al, sorry about the slow response. I've just discovered all these comments I've never seen (didn't get any notifications). To answer the question, the O2 is a decent design at the price, but it's not as "reference" as it was perhaps intended. Yes, it amplifies the sound without particular coloration, but the quality of the sound is a bit dry and harsh. For $100 USD it's great, but amps like the SMSL SP200 are a reasonable step up for not a huge amount more.

[@leyander87]

Fantastic review! I just signed up to be notified of new reviews! for a balanced use between the audio gd nfb1 and thx 789 which would you recommend? but more generally which of the two do you prefer in the overall?

[@PassionforSound]

Hi Mario and thanks for subscribing. I haven't heard the NFB 1 for a very long time and can't provide a thorough comparison. What I can say is that I own the C-2 anniversary amp which is basically the single ended version of the NFB 1 and the 789 destroys it! I'd choose the 789 over the C-2 everytime and would therefore be more comfortable buying the 789 based on my experiences to date, but please check out some other reviews of the NFB 1 before pulling the trigger. The C-2 falls short for me in terms of the sound being a bit flat (in the soundstage) and unengaging so maybe look for signs of that in NFB 1 reviews to help you decide. Good luck!

[@leyander87]

Passion for Sound thanks so much for your fast and useful answer! I’ll check it out!

[@worldgonewrong2049]

Great review, thanks. I bought the 789 a while back and thoroughly enjoy it. I run it with a Topping E50 DAC and find the listening experience through the balanced side with my HD650's very pleasurable. I love the sound of that headphone and the 789 does not alter it. I've got quite a few dacs and amps left over from my evolving interest and I feel I can stay put for now for a couple of reasons. 1, I like the sound quality I am attaining, and 2, I fear it would cost a bundle to upgrade to something much better. Cheers

[@PassionforSound]

So glad you're enjoying your setup. It's great when we find that perfect sweet spot of sound!

[@noelsetterington648]

@@PassionforSound I am sticking with the hifiman se6 v2 And I have dekoni Sheepskin pads and a single ended pentagon cable as you suggested thank you. Now I have a choice I have narrowed down to 2 dac amps instead of just an amplifier I am looking at the hifiman ef400 Or the topping dx7 pro. Which I hope would have enough power to bring the best out of the v2s The volume on the v2s is approximately 83 decibels and ohms 64ohms Which God help me

[@PassionforSound]

I've actually got the DX7+ Pro and EF400 here now, but haven't tried it compared both just yet. The EF400 is great and will likely bring the best out of the HE-6 (assuming that's what you meant?) thanks to the EF400's slightly rich, full sound

[@noelsetterington648]

@@PassionforSound I've gone for it the Hifiman ef400 managed to get it brand new for £463. So I'm set for a great experience amen hahaha

[@noelsetterington648]

@@PassionforSound There are 3 versions of the he6 the original he 6 years ago the he6se and the one I've got he6se v2. I am getting the ef400 tomorrow. God bless you Noel

[@gnewt75]

Great review. This amp sounds like one of the best sounding out there. Hopefully Massdrop produces more.

[@gnewt75]

Lachlan Fennen would you say this removes all or most hiss or noise from the headphones when you've listened to various music?

[@gnewt75]

Lachlan Fennen I see. I own the Clears and a very cheap but good amp. I'm wondering if this amp will significantly improve my listening experience it.

[@buster7618]

@@gnewt75 most likely.

[@gnewt75]

Sum Ting Wong thanks for the reply. Do you own this amp?

[@buster7618]

@@gnewt75 not yet, but I hope to pair it with my new rme adi2 dac. From what I've heard this amp will definitely add some width to headphones along with some other things. What are you currently running your clears with and do you enjoy them?

[@xeniavader]

For me, the more transparent the amp, the better (gsx mk2 is my main driver), let the cans color the sound. Fun trying different cans, keep the electronics constant. Great review.

[@PassionforSound]

That's a really good point, Xeniavader. Whilst I do love my tube amp, the transparent amps like 789 / GSX MK2 are definitely better when it comes to predicting how a certain headphone will sound with it. For example, the NightHawks and Clears are both great with the Mainline (tube) amp, but I don't enjoy the NightOwls as much with it. And yet, the sound signature of the Owls sits in between those other two!? In contrast, all 3 sound great with the 789.

[@MarkSubsonik]

Have been doing a fair bit of research before I finally pulled the trigger on one of these. By far the best and most comprehensive review of the 789 out there. Thanks for taking the time.

[@PassionforSound]

Hi Mark, thanks for the compliment. Glad you found the review both thorough and helpful! Enjoy your 789!

[@MarkSubsonik]

@@PassionforSound Much appreciated 👍

[@xk964264]

Mark Subsonik same I just bought one used today from amazon, fingers crossed gets here Friday. Wondering what I would be looking for to see if its a decent working unit

[@MarkSubsonik]

@@xk964264 Unfortunately, I don't have my unit yet so I can't help much. Hope you enjoy it though!

[@PassionforSound]

Main things I would look at (based on general experience, not specific 789 issues) are the volume control doesn't create any noise when turning and that all sockets work and produce identical sound quality and volume.

[@BunnyslippersEUC]

I only want the headphones to colour the sound. That's why I bought the Rupert Neve RNHP headamp. I wanted a headphone amp which could power iem's and 300 Ohm headphones (never tried 600 Ohm). It's expensive, but small, doesn't get hot, build like a tank. I trust this amp. It doesn't have a balanced out like the 789, but I feel it doesn't need it. When I want to demo headphones at a store, I take the Rupert with me.

[@VidyabhushanTiwari]

Yet to find an amp better than the RNHP.

[@PassionforSound]

It looks really interesting! I might have to check that out. Thanks for the tip!

[@BunnyslippersEUC]

@@PassionforSound Well. To add flavour to some headphones I also bought a full tube amplifier and a class A amplifier. It's fun to change between the amps. I can actually hear what tube and class A is doing with the sound, compared to my Rupert.

[@PassionforSound]

That's the fun of it, isn't it? 🙂

[@danareed4828]

I have this amp and like it a lot. I also have the Schiit Jotunheim and like it a lot. With the HE6SE, I like the Jot a bit more. With anything else it’s hard for me to distinguish them. The three gain levels allows a bit more control with sensitive iems, but the Jot still has great channel balance with my se846, you just have to be a bit more delicate on the knob

[@PassionforSound]

Thanks for sharing, Dana! Interesting that you prefer the Jot with HE6SE.

[@roberthodge6711]

Thanks for the video! What DAC would you recommend for the 789?

[@PassionforSound]

Hi Robert, thanks for watching! Ideally I'd go for a balanced DAC, but it's not crucial. I'm about to review the Airist R2R DAC from Drop which is shaving for the price, but not balanced. If you can spend a bit more, I'm a huge fan of Schiit Audio's multibit DACs and the Bifrost is being / has been updated to offer balanced output. Make sure to go for the multibit version (aka Bimby). I use the next model up, the Gungnir Multibit (Gumby) and love it!

[@acbarnard]

Great review. Subbed...

[@PassionforSound]

Thanks Alan!!

[@TomlinsonHolman52583]

Great review. Is the Monoprice THX AAA 887 a true balanced amplifier all the way through? Thank you.

[@PassionforSound]

Hi Hammer, I don't specifically know the 887, but I don't think it's truly balanced. Pretty sure it uses the same approach as the Drop 789 which doesn't maintain a balanced signal throughout.

[@themedtutor4226]

Hey Lachlan, I have a question for you. Have you seen the measurements for the new JDS atom amplifier? A lot of people have stated they feel like the difference between the atom and 789 is so slight it cannot be differentiated. I'm wondering if you think there is a audible difference between the two? I am currently listening with the HD6XX, so power is not an issue between the two. Thanks for the excellent video!

[@themedtutor4226]

@@PassionforSound Sweet thanks for the reply! I currently have it, and it is exceptional. Looking forward to seeing your review on it. Would love to hear how you think it compares to the 789 once you get to listen to the atom.

[@junglist82]

I'm thinking about grabbing one of these due to all the positive reviews and measurements. Any recommendations for DAC pairing?

[@adamasx5303]

i just bought one and am thinking of the topping d90 or the denafrips-ares ii r2r dac!

[@PassionforSound]

Both great choices - depends on whether you want a more analog sound (Ares) or a more neutral (perhaps ever so slightly digital) sound

[@zackw4941]

Nice review, very detailed and well explained. The thing I want to know though, how does this 789 compare to the Audio-gd sitting behind you!? (And which one is it?) The pros and cons you've pointed out comparing a very neutral amp to colored amps, are kind of a given. I want to know how it stacks up against another very high quality solid state, with lots of power and the same objectives. I happen to own an older NFB-10SE and quite like it, but wonder if either of these newer designs are worth switching to.. Thanks!

[@zackw4941]

Obliterates, you say? If I'm not mistaken, the lowest end Audio-gd with that chassis, is the C-2? Which is a single ended version of the NFB-1, only with a higher voltage PSU to make up the difference in output.. Not really a low end unit, in the scheme of things. If the 789 is really that much better, then it should implicitly obliterate my NFB-10SE.. Which is very interesting at any price, let alone $350! Did I guess your Audio-gd unit correctly? I'll have to hope this comes back up on Massdrop!

[@zackw4941]

Wow, the 789 seems to be right up my alley then. Thanks for the comparison and feedback! Strong (clean) bass and a good three dimensional sense, are both very important to me.

[@jasonwhitehurst7576]

WHERE DO I GET THAT HEADPHONE STAND for my Focal's? Nice vid.

[@kcmega007]

hi, could you do a Monoprice THX AAA 788 amplifier review as well , thanks

[@horstschimanski6608]

best review!

[@FlankerH]

Thank you so much for the review. Learnt a lot of good stuff. Feeling happy that I chose the right one. I got this delivered today and enjoying it using my Sennheiser HD6XX headphones. I understood the value of having an amp for the first time. But I don't have a DAC. I am using my desktop's onboard audio DAC - SupremeFX S1220A (ASUS Motherboard). I am not sure if I am losing quality here. Massdrop Grace Design DAC is on sale right now. Wondering if I should go for it or use my Desktop's onboard DAC? I also connect the Amp to my MacBook Pro 2018 while working on Mac. I wonder if the MacBook DAC is good.

[@hexoplon]

I'd say go for it! The Grace Design DAC is a great DAC for the price, and should be noticably better than the onboard sound

[@Thuddster]

Agreed, most popular external DACs will sound better than your onboard audio. I also have a 789, and IMO it benefits from a balanced input. I recommend to try to get a DAC with a balanced output if you can find room in the budget. FWIW, I also have a Grace SDAC from Massdrop. I'd say that it's a good DAC alright, but a good balanced DAC will sound better and it will be noticeable with this amp. The hype is real with this amp, it's fantastic and scales with everything I've connected to it.

[@FlankerH]

It was out of my Budget actually. I was about to buy O2 amp but it was sold out, so I ramped up my budget and bought this one. I bought Grace Design DAC today. I will upgrade to balanced later. Thanks, guys.

[@somraj8100]

Bro, are u from India?

[@Thuddster]

This is a very good and thorough review! The only thing I'd suggest to improve upon it would be to open the unit and do a walk-through of the components used, layout, and interconnects. I do agree with your assessment of this amp, it's everything you have said it is. It's become my favorite amp ever for multiple reasons, and these are gonna sell like crazy as word gets out. I mean, who would think end-game performance can be had for under 400 clams?

[@Thuddster]

@@PassionforSound heh, well the life of a KZbin reviewer means living on the edge...you take the risks so the viewers don't have to...

[@Matt_Carter_54]

Does the monoprice thx 788 provide similar results?

[@warrenbenson4579]

You should definitely do more videos

[@amirraouf7]

Hello mate and thanks for the review :) Do you by any chance know where I might be able to get this amp in the UK ?

[@amirraouf7]

@@PassionforSound I already have and thanks for the link. :)

[@TheJustpassby]

Does it stack well with Audio-gd r2r dac? possibly replace audio-gd amplifier too?

[@Shoaibexpert]

Great review. My unit is making scratchy sounds when I turn the pot after 1 year of use...should I return it or is this problem a non issue? I basically use it at fixed volume mode and use the DAC volume to change SPL. I just bought a Linear PSU for this as well. You can't get another one now btw...it's sold out. Thanks

[@PassionforSound]

Hi Shoaib, is it gone for good or can you request another production run? (Is there a "request" button?) As for the volume pot, if it's only when you're turning it and you rarely turn it, them maybe not a big deal, but I'd be contacting Drop and see what they say. You might get a partial refund or something if they can't provide warranty repair. Oh, and I'd love to hear your experience with the linear power supply!

[@Shoaibexpert]

@@PassionforSound Sure thing. Now in the process of shifting myself to Canada which has 110V rated PS....also the input voltage of my Linear PSU for the 789. Will share my experience after I set my things there. As for Drop, it's strange! They gave me an option to return the item for full refund maybe in store vouchers but did not offer to replace the unit. They also offered $20 and said I could keep the noisy unit...which is the strange part as they could not replace it. As you know, there is very little competition that performs as well as the 789 at this price point...I mean both the SP200 as well as the Monoprice 888 amp + dac don't very much compete or fall short in one or the other measurement criteria ( I could be wrong here) when compared to the 789 so it's kinda irreplaceable for me at this time. Cheers and keep up the good work mate!

[@PassionforSound]

Not sure how much you paid for the 789 as it's changed over time, but if you can take the refund, I might have a good replacement option for you depending on budget. The Topping A90 is brilliant and better than the 789 in all ways but one. It's not a good option for IEMs, but for full size headphones it's a really nice option. If it's out of the budget for now though (or you use IEMs) I'd take the $20 and be happy using the SMSL as a pre-amp - still an incredible setup for the price! In theory (I haven't specifically looked) you could have someone good with soldering hardwire the signal path to bypass the pot altogether. You'd actually improve the sound slightly. You could probably rig it so the knob stayed in place so it's not ugly, but that could offer a win-win if the pot ever totally dies.

[@Shoaibexpert]

@@PassionforSound Wow! That's really beautiful advice. Put my mind at ease...never thought that I could bypass the pot on my 789. In all honesty, between the shipping and refund in store vouchers and the Linear LPS I've got waiting...I'll live with the 789 a bit more untill say a A90 PRO or Super PRO comes along...you never know with the rate China has been producing stuff...that might me a few months away. Cheers mate!

[@bix64000]

Quick question, as I am just getting into the audiophile world ... balanced vs unbalanced : my understanding of the 4 pin XLR plug is that there is only one ground, then R+/R-/L+/L- as the 4 pins. With that in mind, both sides share the same ground. It wouldn't be the case if two 3 pin XLR were used. But in the case of a 4 pin XLR, am I correct to assume that we lose the theoretical separation that we were supposed to get from the separate grounds ?

[@bix64000]

@@PassionforSound Thanks a lot for the reponse. I also looked it up on wikipedia and turns out that separation comes from no crosstalk between L and R because the + and - in each channel cancels out any EM field that could create crosstalk, the way it does with TRS connections.

[@christophschuermann6512]

Nice video. I just missed a look inside the little box.

[@christophschuermann6512]

@@PassionforSound i totally agree. I hope you can do it in near future. I would send you two units at no charge, because it helps to find a good product at the end. You explain everything very clear and very honest to the people out there. Thanks for your work.

[@verystarrynights]

Thank you for this detailed review, I have a few questions: 1. Do you know if you can use the RCA input from the 789 while also using the passthrough at the same time? For example using headphones and using the passthrough to your active speakers. 2. Can the input control disable the passthrough? 3. Does the volume knob affect the passthrough?

[@verystarrynights]

Excellent this is exactly what I wanted to know, thank you for taking the time to test it out!

[@elkadillo4511]

Did you get an answer to this? I'm looking myself how to use connect headphones and speakers at the same time to switch between them.

[@verystarrynights]

@@elkadillo4511 Hi mate, he did respond however the comments seems to be removed. I will quote what he said "Hi TiV, sorry it took me a while to respond - I wanted to test the amp first so I could be certain of my answers. The passthrough is completely passively which means the it is not influenced by the headphone sockets or the volume control. It is a permanent connection to the next amp (like using a splitter)."

[@PassionforSound]

Thanks for sharing. I wonder where my original post went??

[@elkadillo4511]

@@PassionforSound So I have cheap Logitech Z313 speakers and I'm waiting for a bit on a DAC so will only have the amp for a while with no DAC. Can I use a RCA to 3.5mm to connect to my PC directly and somehow still use have my speakers connected?

[@ohnonate]

Another great review thanks you. Im a hifi guy and never had a pair of headphones. Recently i got my hand on one and i was wondering what would would you suggest as a good decent headphone for $600pair up? I have a Denafrips Aeries II DAC. Appreciate any help at all.

[@PassionforSound]

I'm a big fan of the HiFiMan Ananda for its price and would probably start there. It should pair well with the smoothness of the Ares 2 also

[@ohnonate]

@@PassionforSound Thanks for the feedback i really appreciate it.

[@PassionforSound]

My pleasure 🙂

[@IanVickrey]

It's baaaaaaaack!!!

[@bentlikeitsmaker]

looking at the amp in the back so plans for a video review

[@AaronRpsychology]

What DAC would be recommended to use with this amp? Great review btw!

[@PassionforSound]

I think any good DAC will work for any headphone setup because a good DAC shouldn't be overly coloured. Depending on your budget, anything from the Topping E50 to the Schiit Bifrost 2 (recommended), Burson Composer or Chord Qutest (also recommended) are strong choices.

[@AaronRpsychology]

@@PassionforSound Thank you for the quick response, it's appreciated! Keep up the great videos =)

[@PassionforSound]

My pleasure 🙂

[@JustASnack]

Fuuuuuuuck I want this amp so bad! I really really hope there's another drop for it soon

[@JustASnack]

AYY THERE'S ANOTHER DROP OF THE AMP AND I ORDERED ONE YAY

[@whn2309]

Unfortunately as good as it may be it’s not reliable. Stops working after three months. Total brick after very little use. First Massdrop amp to give me any issues. Total junk

[@whn2309]

Lachlan Fennen Yes it just stopped working. Went to turn on and red light stays red. On Massdrop discussions this issue is a problem that a few others have also talked about. Massdrop is sending another out but have been extremely difficult to work with. One of their offers was actually to give me $25. to just keep as is and I would only be out $325 but I would have a very attractive $350 paperweight. They also wouldn’t give me a full warranty saying that the replacement will only have what time is left on the original amp. First bad experience with Massdrop but customer service really didn’t seem to care.

[@elias38]

Shit, I missed it. Now, how long will I have to wait for the next one... What DAC do you use?

[@whn2309]

Lachlan Fennen Thanks, I just now received my replacement Amp and so far all good. Hopefully this one will not have the same issues as my first one. Is there a Dac that you would recommend to pair with the THX? I’m new to the whole Dac thing. I normally just run my IPhone XS right to the back of the amp using RCA cables

[@TraceLight]

Would this or the LCX pair well for balanced hd600? I have the LCX and a family member who wants it. I’m just wondering if the THX will just suck out the thumping bass the LCX gives it

[@TraceLight]

Lachlan Fennen it is a warmer sounding amp that is also made by massdrop. It actually makes the Hd600s have bass presence in them. My wonder is if the THX does the complete opposite of that (as people describe it as bright) While others describe it as “fuller sounding”

[@Abbbb225]

@Lachlan, is there any reason that this would sound different from the monoprice version (with the built-in DAC)? Might pull the trigger on that, but only if the amp sounds identical.

[@Abbbb225]

@@PassionforSound Thanks, good answer.

[@Abbbb225]

@@PassionforSound If you find out anything else, please let me know

[@pentapandamusic]

I'm a music producer and by no means audiophile but the overwelmingly positive reviews eventually got me purchasing this one, hope it is better than the liquid spark which I originally intended to buy.

[@PassionforSound]

Hi Penta, I hope you find it as clean and neutral as I've found it to be. It's one of the few amps I've ever owned that works beautifully with EVERY headphone or earphone I've ever tried - a good sign of neutrality.

[@pentapandamusic]

@@PassionforSound Thanks for the reply. Do you know if an audio interface's DAC (e.g. I have an Arturia AudioFuse) is good enough for audiophile listening? Or do I have to buy a dedicated DAC in order for the 789 to be any good?

[@PassionforSound]

Hard to say as I don't have direct experience, but these sorts of devices can rarely compete with a good external DACs because they are using an off-the-shelf chip and they are focussed on the total product, not JUST optimising the DAC section. Perhaps you can test it before buying to be certain.

[@BryanCkh]

How would the SE Out work if I wanted to connect this to powered monitors (JBL Lsr 305) ? Thanks for the review! I'm looking to get one soon.

[@BryanCkh]

@@PassionforSound Ah okay, I do however own a DAC with a volume knob on it. I also own a pair of HD 6XX as well. I just want an AMP that powers my headphones and let's me switch between my studio monitors when I feel like it, would this be a good buy? Thanks for the reply Lachlan

[@slimthungc]

@@BryanCkh you could get a separate preamp like this one for volume control for your monitors.. www.amazon.com/dp/B01MXC9HHW/ref=cm_sw_r_cp_apa_i_ZrliCb4MYHSJQ

[@ELSA-ex4ph]

I have the el amp and a nfb11.28 am using the saber dac with clears how would the thx sound replacing the el amp on my nfb11 using my clears?

[@memberrrberry7282]

Mitch Turbisky I thought you had this amp???

[@Richbroth]

I see a audiogd in the back there which model is that?

[@romanlewandowski9616]

Great review. is it a fully Differential balanced amp ?

[@PassionforSound]

Hi Roman. No, the signal is not fully balanced throughout. It does have true balanced inputs and outputs, but the amplification itself is not balanced.

[@topspin4hand]

@@PassionforSound Since it isn’t fully balanced throughout, is what you said about the single ended output only using half of the circuit true? I’ve seen other reviews saying that the circuit inside this amp is actually single ended.

[@PassionforSound]

Hi Positron, I'm actually not sure exactly where/when the signal gets split. When I recorded this I was unaware of the fact that it wasn't a truly balanced design throughout.

[@bimmer100timc]

it doesn't drive my susvara's very well at all. but I expected this. I should add... it powers all my other headphones fairly well... which is around 40-50 pairs and many flagship models. yet oddly experiencing random bits of distortion or buzzing. therefore this is going up for sale. can't compare to my iFi Pro iCan or HoloAudio Azure. but its the best cheap amp i've tested ever. It's great for most headphones and pairs well with a lot of midrange gear.

[@buster7618]

Ill buy it from you for msrp lol. Is it still available?

[@Viewer13128]

Can this drive and make the HiFiMAN Arya sound great? Is it considered high end or mid? This doesn't have 2.5mm and 4.4mm balanced output, right? Then the sound will be not as good with balanced connection for the Arya (the 3.5 SE output will sound worse), right? Are there adapters or something to connect 2.5mm and 4.4mm balanced to it? What is a cheap DAC that performs well like the THX AAA 789 in value? How does this fair against the Questyle CMA 12? PS: Is the Q5S + THX AM3D enough to make the Arya sound great?

[@PassionforSound]

Although I don't have the Arya to try with the amp, the 789 has lots of power and should have no issues with the Arya. You can buy 2.5mm to XLR adapters to use the balanced connection, but it doesn't make a huge difference with the 789 other than a bit more power. As for the DAC, there are plenty of good options out there both from Drop (Airist R2R or SDAC), Schiit (Modi, Bifrost, etc.), or Topping (D50s). If you're looking for an aesthetic match (same case style and size) go with the Drop options. Sorry, but I can't answer your last 2 questions having not tried the gear.

[@Viewer13128]

@@PassionforSound thnx! So I guess sound/performance wise, the D50S is the best of the ones you listed?

[@PassionforSound]

I would say the D50S WITH an upgraded op-amp is the best of the lot based on what I've heard and comparisons I've seen for those I haven't heard. The stock op-amp is pretty average, but going to a MUSES02 really takes it up to a new level.

[@Viewer13128]

@@PassionforSound thnx. So would I need hifiman arya + D50S dac + MUSES02 OP amp + THX789 amp (or smsl sp200 amp)?

[@Farpun]

Can you use an unbalanced signal in to balanced output? In order to get the extra power from balanced out?

[@Farpun]

@@PassionforSound cool thanks for looking into it

[@theprinceofeverything1975]

Incredible review! Is it possible for me to use my phone with this amo for the source of music?

[@PassionforSound]

Thanks Prince. You could, but you'll get significantly better sound with even a cheap external DAC like a Tempotec Sonata HD Pro between your phone and the amp. Definitely worth the upgrade

[@theprinceofeverything1975]

@@PassionforSound thank you so much for your help! You are the best reviewer!

[@PassionforSound]

My pleasure

[@yogiwp_]

Man the wobbly desk drives me crazy. Great review though!

[@yogiwp_]

@@PassionforSound It's weird that once I noticed it I keep seeing it. So tempted to go back to headphones because of this review :) (sort of abandoned it for speakers set up)

[@7nage]

I'm new to the audio game and i got a Sennheiser 6XX, THX AAA 789 and agrace design SDAC. What cabled do i need to run these 3?

[@PassionforSound]

Hi Deku and welcome to the world of headfi. You'll need a USB cable to connect your computer to the DAC (I highly recommend Audioquest's USB cables), a pair of RCA cables to connect the DAC to the amp and then your headphone cable that came with the 6xx (or an aftermarket one if you like). Your next step at some point will probably be to upgrade your DAC to a balanced one to maximise the potential of the 789 amp, but it's not a huge deal.

[@7nage]

@@PassionforSound Thank you so much for your assistance! You just made another fan!

[@deepskypics]

Can you recommend a similarly priced DAC to pair with this good Sir?

[@deepskypics]

@@PassionforSound Thanks for the reply Lachlan! I love the Multibit DAC in my Jotenheim!, which is the core of the Modi Multibit. I don't like using the Jot's DAC via preout though. I have a Grace SDAC actually. With my JDS Atom, I find it a bit blah and dry sounding. With the Atom I find that the Topping D30 is my preferred with what I have. It's a bit cold and glarey, but its lts also interestestingly lively, detailed, and organic sounding, I prefer it over their D10 too, which sounds a bit warm in the bass and smoothed out. I'm looking for something that will just totally get out of the way. I feel that the Atom is so transparent that I hear the DAC. Because I like my D30, I've been looking at the D50 as well as the SMSL SU-8. I have 3-months to decide, but I'm planning for the THX to be endgame and Atom to be back pack amp

[@deepskypics]

Perhaps the Modi Multibit is a good option to think about since I love it so much in my Jot. It doesn't sound digital, and it's musical and lively. Also I love your reviews!

[@sebastienst-hilaire189]

Hi I'd like to know if I can use my Samsung S10 cellphone (Android) with Spotify to listen my music directly with this amp without using a computer ?

[@PassionforSound]

Hi Sebastien, in theory you can by simply running a 3.5mm to RCA cable from your phone to the amp. It's worth noting that the sound quality will be quite limited compared to using an external DAC, but that's also true for a computer.

[@sebastienst-hilaire189]

Hi, If I use a Dac/amp like the Monolith THX monoprice (www.monoprice.com/product?p_id=24459), would it be possible ?

[@nicktan4530]

@@sebastienst-hilaire189 yes

[@Satyrua]

It would be a good comparison between THX AAA 789 and the engine on your back (it's Audio-gd NFB-1AMP or NFB-28).

[@Satyrua]

@@PassionforSound Oh, I see. It's single-ended amp

[@shoobopper]

What dac would you pair it with? I’m looking at the SMSL SU-8

[@shoobopper]

@@PassionforSound The SU-8's drop on massdrop was ending so I picked it up. I think it'll be suitable for my needs. Of course for warmth I could always try out some tubes. :)

[@zionrobotikz3841]

Could you recommend what xlr cable to buy to pair this amp with my modius. I am so confused on the L and R. Do I need two cables?

[@PassionforSound]

Yes, two cables needed. If you buy audio cables (not pro mic cables) they will come in pairs usually. I quite like the Supra interconnects and they have options at multiple levels so I'd probably start with either some Supras or AudioQuest also make good cables

[@zionrobotikz3841]

@@PassionforSound thank you! I was wondering, can you use a 2-Channel XLR Colored Snake Cable vs having 2 separate cables

[@PassionforSound]

No reason why not. As long as the two independent 3-wire cords don't share any wire and are just two cords bonded in the centre with the insulation it will be fine

[@fatdoi003]

I'd like your comment between the 789 to the NFB1 @ the back....

[@fatdoi003]

@@PassionforSound oh i didn't realize is C2... thanks for the comparison.... was interested on the NFB1 before 789 appeared

[@kuuhgle]

Would this be a big upgrade to the Topping DX7s internal amp?

[@PassionforSound]

Hi kuuhgle, I haven't tried the DX7, but I would expect an upgrade being a standalone amplifier. It's rare that an all-in-one device will match the performance of similarly priced standalones.

[@mjjm6220]

I don't have the 789, but I have the Monolith THX AAA 788 with AKM DAC. The THX amp is perfect.

[@PassionforSound]

Glad you're enjoying it!

[@Onibaka]

i have the topping DX3pro dac, do i connect it to the SE input or SE pass ?

[@PassionforSound]

SE input is what you want. SE pass will allow you to connect another device in a daisy chain setup if you add another amp later on.

[@Onibaka]

@@PassionforSound i see, thanks !

[@sunfiresun8758]

Is it a 1amp behind you in the video? how do you compare your 789 to audiogd?

[@JasonAlexander1969]

Can't speak for the author of this video, but I have both and would say that I think they very close. I still like the Audio-gd better, but I think it's because of the edge of having more power that pulls through with the bit more detail and transparency. They both are exceptional though.

[@sunfiresun8758]

@@JasonAlexander1969 Thanks for the information, I just got a 2ndhand utopia 2 days ago, kinda of disappointed with the sound, pairing with thx789. What headphone are you using?

[@sunfiresun8758]

@@PassionforSound I am using the balanced, and to be honest, I couldn't hear much difference between balanced or not...

[@JasonAlexander1969]

@@sunfiresun8758 I have Focal Elex that I mainly use, and based on what I've read, I think that would be a better pairing than the Utopia's but not sure since I've not heard them. I did try the Elegia and wasn't as impressed by them either as they were too analytical, sterile and very mid-forward. So far my Aeon Flow Closed are my go-to for reference, and they sound great on this amp too. Still , my favourite is the Elex so far paired with the AAA. I also have used it with my Sennheiser 6XX, 600's and also my Hi-fi man 4XX and all are very good, more detailed, less veiled than my other Massdrop amps, and on-par with my AG. I favour the sound of my Audio-GD NFB-1 with the R2R 1 DAC over the AAA with the exception of with my Elex which have bass distortion at low volumes. The THX clips as well on some bass heavy tracks, but at a much higher volume. Not sure why, but for the money, the AAA is a champ!

[@junglist82]

I love this amp and also pair it with the Clear. It's one of the best values in this hobby (rabbit hole). Curious to know what your reference dac is?

[@PassionforSound]

Hi Junglist, it's great, isn't it! I've been using the Schiit Gumby (Gungnir Multibit) for years, but recently swapped to the Chord Qutest. Check out my review of the Qutest if you'd like to know why and hear about the sonic differences between the two.

[@junglist82]

@@PassionforSound I only wish the Qutest had balanced outputs to run with this balanced amp. I'm using an SMSL SU-8 v2 at the moment. I like it, but I would also like to try something that's not ESS based.

[@somefatazn]

Where is this amp made?

[@gino3286]

Thanks a lot for the very nice review. When an amp practically perfect can be built for 350 USD ... i wonder why all the others are so damn expensive. Sincerely. Why limited number i do not understand. How sad. But happy to understand that for one time great measurements and great sound go together ... good. Peace of soul and mind.

[@SmokeyMesa]

Go to MassDrop, they have more now!

[@gino3286]

@@PassionforSound Hi Lachlan thank you very much indeed for the excellent video and very kind and valuable advice. I understand that is not fair to expect SOTA performance from a unit this cheap. SOTA performances usually come at a premium price. If not premium price units would have no market. I am quite willing to give up with the last drop of fidelity. Your words at 18:06 have really caught my imagination. I think you have expressed perfectly what i am looking for. The feeling to be connected directly to the music. This little amp should be a great monitoring tool for recording engineers as well. That is my final goal beacuse i would like to record small classical ensembles. Great review and video. I have the strong feeling that we are experiencing a revolution with these THX AAA modules. They can be made portable quite easily i understand. Kind regards, gino

[@gino3286]

@@SmokeyMesa Thanks a lot ! regards, gino

[@brucekhamp6859]

Yo, can someone help me out here. I just got in my 789 yesterday (the older Massdrop version if that makes a difference) and I have to paired with my Mbox Mini 3rd gen audio interface via Mogami XLR. I'm using my Audeze LCD X with this setup with high hopes of beautiful clarity and neutral listening, but some things seem off. One, my gain switch doesn't appear to work. I'm currently listening to music on youtube, turning the switch from 1 to 2 to 3 and get no sound difference. Another thing is I've noticed that while some things sound great there are some things that sound almost fuzzy/distorted or just low quality. Is that due to my volume on the 789 or the Mbox (audio interface) or maybe my PC?? I just really want some help with this so I can get back to listening to some awesome music and work on MY music. Prease and a tank you

[@PassionforSound]

Hi Bruce, the gain switch should definitely make a noticeable difference - as if you're turning the volume control about 15-20 degrees each time. It's not a HUGE change, but should be audible. As for the changing sound quality? That sounds like it's source related (like the recordings). If it's from track-to-track you might just be experiencing the drawback of good gear - you can know tell what's poorly recorded. Alternatively, if it comes and goes even during one song then you might have a fault somewhere. Is it track-by-track? Or does the quality drop mid-track sometimes?

[@brucekhamp6859]

@@PassionforSound Thank you so much for the prompt reply! Would the gain problem have anything to do with the fact that I'm using 2 xlr out to my audio interface but am running the Audeze LCD X's through 1/4 SE (single ended)?? As for the quality, I've only ran songs through my PC on youtube with my setup and have played some tracks over and over again to test for difference of quality and all seem to sound great. It's really when I go to play like a game or something where the audio starts to sound distorted or at a low quality, but I never noticed that before with my old headphones which were decent.

[@PassionforSound]

The gain issue shouldn't be affected by the setup you've got, I think. Have you got anything else you can plug in (and unplug the LCDs) just in case? As for the sound quality, where's the audio coming from for games (PC motherboard, DAC, etc)?

[@brucekhamp6859]

@@PassionforSound So I did some more troubleshooting last night and it would appear that the sound quality is being affected by the Mbox Mini 3 aka what I'm using for a DAC. It seems to be coloring the sound adding warmth and distortion. I'm running the games through what I'm running everything which is the Mbox which is connected via USB to my PC. You suggest that I try out the 789 with a different pair of cans?

[@brucekhamp6859]

@@PassionforSound so yeah I just swapped headphones on the amp and still the gain switch isn't doing anything.

[@hobomnky]

14:37 can some one explain this general rule of thumb: headphones impedance should be at least 8 times the amplifier's impedance. Why is that? maximum power transfer occurs when the two impedances are matched so if anything I would have assumed that matching the impedances would be the ideal. So clearly efficient power transfer is not the main concern... so what is?

[@PassionforSound]

Hi Hobomnky, as I understand it, this rule is about damping factors and frequency response. The amplifier has to stop the driver as well as move the driver and the 8x difference in impedance is all about how well the amp controls the driver. Others may be able to provide a better / more accurate technical explanation of this part. What I can say for certain is that if the output impednace of the amp isn't 8x less than the earphone/headphone it will likely have an impact on both the frequency response and general tonality of the 'phones. This is particularly the case for headphones that have vastly different impedances at different frequencies as some frequencies may be affected by the amp's OI while others are not.

[@hobomnky]

@@PassionforSound Thanks for the quick response, it sent me on a 2 hour deep dive into this. Some of the Wikipedia pages I found gave me cancer though, but I think I understand the overall idea best from your comment. Also I should have said "So clearly *maximum* power transfer is not the main concern" because it turns out that the power transfer efficiency actually goes up as the load impedance to source impedance ratio goes up. You can see it here for the case when the impedances are purely resistive www.desmos.com/calculator/xean75bbum Also the derivative on the power delivered graph shows that at an impedance ratio of 8x the variation of the power delivered as a result of variation of the load impedance is significantly smaller than values less than 8x, with diminishing results above 8x. An impedance ratio of 2x seems to be the worst case scenario. 1x gives no delivered power variation which is ideal but a 7% deviation from the 1x ratio leads to worse power delivery variation than 8x. I'm curious to know how all this changes for impedances that are not just resistive. So basically the load impedance changes with frequency, leading to the power it gets to change with frequency so certain frequencies get amplifier more than others.... that was fun to learn

[@PassionforSound]

No sweat - glad it all made sense in the end. I remember reading about this years ago and it kind of melted my brain a bit which is why I summed it up in my head as I explained it before - probably not the most accurate explanation, but hopefully good enough! Check out these measurements (particularly the impedance vs frequency graph) for the beyerdynamic T1s and Sennheiser HD650s for great examples of headphones that are influenced by output impedance (and part of the reason why people often pair these with high output impedance OTL amps - particularly the old T1s). Info linked from Innerfidelity: www.innerfidelity.com/images/BeyerdynamicT1.pdf AND www.innerfidelity.com/images/SennheiserHD650.pdf

[@hobomnky]

@@PassionforSound cool to see some examples, I was expecting the higher frequencies to have higher impedance but instead they have a peak which kind of looks like and impedance peak from a resonant frequency. So maybe there is some parallel capacitance with the driving coil, or maybe its some acoustics related effect.

[@PassionforSound]

I can't recall the theory behind it (I think I knew it once)

[@althewicked]

I bought this Amp and sold him 2 days later. The price is fair and the build quality is good but the sound was too bright for my taste and also very 2 dimensional. Im listen normally through an RME FireFace 400 and I thought that I needed maybe a Headphone Amp to enhance the sound but the THX did not do that. The sound from the RME is way more fuller and warmer. The THX is a very clean and precise Amp as well as the RME but there was no enjoyment for me to listen with the 789. For everyone who are thinking about buying it I would suggest to looking for a used Fireface. Im from Europe and Ive paid $420 with shipping and duty and for this price you about in the same price range of a used RME Interface and as a big bonus do you have then a very good Audio Interface with enough analog I/O and digital I/O and two very good Mic/Instr. Preamps and if you dont listen to Audio files above 192kHz you even doesent need a additional DAC. And for everyone who bought this Amp already is totally fine because the THX is good. Maybe you can enhance the Imaging with better cables and the brightness with matching Headphones or some EQing. This is just MY experience with the THX and in the end you have to check everything by yourself.

[@althewicked]

@@PassionforSound Everyone has a different taste of listening thats for sure but the reason why I bought this amp is because I thought the THX was very balanced and kind of a reference amplifier but this is not really the case. The RME stuff is not warm per se just in comparison with the THX and Im talking not about Tube vs Solid State warmth but theres a noticeable diference. The FireFace its very linear and well balanced and thats the reason why a lot of professionals use these Interfaces. And also the imaging of the THX is kind of 2D and flat. Maybe you have the opportunity to check a RME Interface by yourself one day ...and if I continue to talk like that about RME they have to pay me soon:) But in the end it doesent matter ...its all about fun and enjoyment! Thanks for your reply! Cheers

[@pkal244]

4:47 fully balanced DAC?

[@MistaLova-Lova]

I've recently bought this amp to add to my Topping A90 as I was looking for an amp with higher input impedance to pair with my Ares II (my other DAC - D90). Wow... I was not expecting this amp to change how both of my DACs sound so much. I thought that the A90 was supposed to be the "king" of clean and linear sound, especially paired with the D90. But there is no denying it - it sounds muffled and slightly congested compared to the 789. Everything else in my system stayed the same, including all the cables so there are no variables at play here. Did you have the same experience? Or am I losing my mind? 😁 It seriously sounds way cleaner than the A90, and not just in terms of incisiveness but also airiness (and thus the perception of soundstage). At first I thought it didn't have the same macrodynamics as the A90 but now I think it's just how I perceive them because things are more clearly separated.

[@PassionforSound]

That's a very interesting experience. I don't think I had the 789 when I got the A90, but I don't rate the A90 quite so highly as many. It's a nice amp, but great measurements don't actually mean better sound so what you're hearing could well be accurate.

[@MistaLova-Lova]

@@PassionforSoundI'm just astounded that the difference is so big, individual notes on the A90 almost sound more glued together and treble is much less crisp. I guess it reflects the devices' reputation where A90 is apparently known to "round off" the edges whilst the THX amp is considered too sharp by many. I just thought that any differences between two flat-measuring devices would be minimal. Not the case by my ears (I'm using high-res headphones - Utopia and HEKse). The A90 also brings everything more forward... strange. Would you still consider the 789 as "perfectly neutral" as it gets for reasonable money or have you come across anything better since then? :)

[@PassionforSound]

It's great that you've had the chance to hear the differences for yourself. I actually find the 789 to have its own colouration in that it can be a touch artificial sounding when compared to some other devices (e.g. something like a Geshelli Labs Archel 2.5 or E2). The 789 is definitely great for the price, but I don't actually think it's the last word in neutrality because it sounds like it has its own sound (for better or worse because almost every amp does)

[@MistaLova-Lova]

@@PassionforSound Thanks. I must admit that after some more listening it's clear to me that I was too quick to criticise the A90 so much. I still think that the THX 789 appears to sound cleaner and crisper but at the cost of less body/meat and worse macrodynamics. Kinda like the HD800 vs Focal Clear - I still think the former has better treble and is potentially slightly more high-res, but the latter will be the one most people will reach for more often to listen to music. The THX somehow sounds like there is a little bit of space between me and the music which reminded me of the time when I switched from using Tidal/Quobuz directly (and thus allowing for Microsoft Windows' drivers to process the signal) to using Roon (bypassing said software) - it eliminated that barrier between me and the music. I now think the the A90 does the same when compared with the THX 789. I am just leaving this comment so that someone browsing through this thread lookng for advice/other people's opinions is not left misled by my previous comments (which are still true, but it wasn't the full picture).

[@PassionforSound]

Thanks so much for posting this and for being so clear about the pros and cons of each device. It's not so common for people to be able to openly admit a change of opinion on this hobby, but it's commendable because it shows that you're listening with an open mind and without your ego needing to be "right". First impressions on this hobby are often slightly misleading because the differences we hear can be exciting compared to what we're used to, but extended listening can reveal more nuance in the comparisons. (Apologies if I've gotten to philosophical now 😁)

[@twinturbo3461]

Is this a DAC / Amp or just amp ?

[@ninhbac04]

can i put SE pass into speaker amp for my speakers?

[@PassionforSound]

Sure can. That's exactly how I use it! :)

[@ninhbac04]

@@PassionforSound cool, do you have to unplug the headphones from the 789 for the speakers to work? I want to be able to leave the headphones plugged in. So you just power off the 789 and it'll run to your speakers?

[@PassionforSound]

@@ninhbac04 No need to change anything. The pass-through is unaffected by the status of the amp. Off / on / headphones connected, etc - doesn't make a difference. Just turn on your speaker amp and enjoy! :)

[@ninhbac04]

@@PassionforSound thanks so much!