SUPERTEST - NEW FOSI V3 MONO vs V3 & ZA3 & 5000$ & 9000$ Amps

SUPERTEST - NEW FOSI V3 MONO vs V3 & ZA3 & 5000$ & 9000$ Amps
More info on the new Fosi V3 Mono - bit.ly/fosiaudiov3mono
Get the new Fosi V3 Monoblockswith Early Bird discounts - fosiaudio-inc.kckb.me/6177f4ef
Get the Fosi V3 or ZA3 Amp - bit.ly/virtalhifi (affiliate link)
SYSTEM IN THE VIDEO:
SPEAKERS: QUALIO IQ - www.qualioaudio.com
AMP: FOSI ZA3 + Sparkos Opamps in Dual Mono mode / Fosi V3 + Sparkos Opamps - bit.ly/virtalhifi (affiliate link)
STREAMER: Macbook M1 Pro with HQ PLAYER for Upsampling
DAC: T+A DAC 200
CABLES: Audiomica Excellence USB, VirtualHiFi interconnects and speaker cables
FOOTERS: VirtualHiFi Vibron
Few months ago I bought 2 FOSI ZA3 and they became my daily amps very fast. Now Fosi released new Fosi V3 Mono and I tested them for you and compared to Fosi V3, Fosi ZA3 and so that you have a reference to way more expensive amps - 5000$ Naim Supernait 3 and 9000$ Canor AI 1.20 Also I am doing op amp rolling and in this video I am testing the Sparkos 3602, Muses 02 and NE5532 op ams for you. So just put on your headphones for the best experience and I'm waiting for your comment ;)
00:00 - Introduction of Fosi V3 Mono
02:42 - Measurements
03:18 - Thermal stability
03:56 - Op amp Rolling
10:54 - Listening Test 1 - Opamp Rolling
11:27 - That's How You Know That You're in Love - Loving Caliber
12:57 - Purple Beach - Giants’ nest
14:27 - The One - Ritchie Everett
15:57 - Love You For It All - Daniel Gunnarsson
17:27 - Wood & Skin - Hara Node
18:57 - The Blues This Morning - The Tap Room
20:27 - I Am Better Off (Jazz version) - Wildson
21:57 - Erase My Truth - Deaf Election
23:27 - Folium - Bladverk Band
24:57 - Op Amp Rolling Conclusions
28:56 - Listening Test 2 - Fosi V3 Mono vs Naim Supernait 3 vs Canor AI 1.20
30:38 - That's How You Know That You're in Love - Loving Caliber
32:08 - Purple Beach - Giants’ nest
33:38 - The One - Ritchie Everett
35:08 - Love You For It All - Daniel Gunnarsson
36:38 - Wood & Skin - Hara Node
38:08 - The Blues This Morning - The Tap Room
39:38 - I Am Better Off (Jazz version) - Wildson
41:08 - Erase My Truth - Deaf Election
42:38 - Folium - Bladverk Band
44:08 - A / AB / D Class Amps Rolling Conclusions
46:54 - Listening Test 3 Fosi V3 Mono VS Fosi V3 vs Fosi ZA3
47:50 - That's How You Know That You're in Love - Loving Caliber
49:10 - Purple Beach - Giants’ nest
50:40 - The One - Ritchie Everett
52:10 - Love You For It All - Daniel Gunnarsson
53:40 - Wood & Skin - Hara Node
55:10 - The Blues This Morning - The Tap Room
56:40 - I Am Better Off (Jazz version) - Wildson
58:10 - Erase My Truth - Deaf Election
59:40 - Folium - Bladverk Band
01:01:10 - Fosi V3 Mono VS Fosi V3 vs Fosi ZA3 Rolling Conclusions
Few months ago I bought 2 FOSI ZA3 and they became my daily amps very fast. Now Fosi released new Fosi V3 Mono and I tested them for you and compared to Fosi V3, Fosi ZA3 and so that you have a reference to way more expensive amps - 5000$ Naim Supernait 3 and 9000$ Canor AI 1.20 Also I am doing op amp rolling and in this video I am testing the Sparkos 3602, Muses 02 and NE5532 op ams for you. So just put on your headphones for the best experience and I'm waiting for your comment ;)

[@VirtualHiFi]

Please LIKE and SUBSCRIBE For stunning revolutionary 3-way speakers visit - qualioaudio.com Need to get the NEW FOSI V3 Mono - fosiaudio-inc.kckb.me/6177f4ef (affiliate link) Need to get the Fosi ZA3 or V3 Amp - fosiaudioshop.com/virtualhifi (affiliate link)

[@forymar]

How many opamps should I replace in total in the mono Fosi v3?

[@edwaux2929]

Thanks for the excellent review style. Question: Can you test/comment on running the V3 Mono as a designated sub amp? I have the ZA3 already, and have been planning a 2.1 portable system. Was going to use ZA3 in mono to run the sub 2 ohm 12 inch in a ported box. Now I think I can use the ZA3 for tops with Sparkos and Muse2 in V3 for the sub. Any thoughts would be appreciated!

[@KeithHeinrich]

Finally a reviewer who cares not for technical measurements but only how they sound. Subscribed.

[@10sassafras]

Reviewers have been shooting from the lip for decades. Opinions with nothing to support them have never been hard to find.

[@KeithHeinrich]

@@10sassafras true, however this is not that.

[@VirtualHiFi]

Thanks for the positive words feedback and subscribing. Hope you will find plenty of value 😁

[@ottosato]

Just wake up in the morning, have a cup of coffee and check this vlog. Refreshing indeed. Cheers.

[@carlesjuliavallmajo3812]

love your rewiews , 30 years into hifi and i opened up to new possibilities . Qualio Iq + t+a or other good dac / source ( shanling ) + fosi v3 , new life in my hifi journey , Thanks bro !!!

[@VirtualHiFi]

Thank you for your very kind words. We are underdogs here for a long time ;) it's all about matching the system and finding the hidden gems in the audio world and not about spending 💰💰💰 so once again thank you ;)

[@vmm4858]

Excellent content. Thanks for sharing. 🎶

[@VirtualHiFi]

thank you 😊

[@ajzepp8976]

This guy puts in the work. Earned a new sub

[@VirtualHiFi]

Thank you and welcome 😁

[@riccitone]

This is the review I was hoping for. Thank you for taking all these steps and providing such clarity on these little guys. Totally agree with your sound signature preferences btw. Would love to try these, even if for the novelty. Of course, would be a little sad if they actually outperformed my amp 😂

[@VirtualHiFi]

Glad it was helpful! Yes that is a reasonable assumption to be scared On the other hand they cost silly money - especially the V3 stereo with power supply is 130$ :)

[@mrcarpentersc]

Incredible video! Loved the blind comparison. Bummed that I thought the monos at the end didn't sound as good, to me, as the other two. I ordered 2 monos with separate 48v 10a power bricks. Again, great review!!

[@donnywidodo8874]

the monos still got the most technicality for me, so I think you're a ok, just tailor the sound with cables,source etc. to your liking, the surprising thing tho is how good is the v3 stereo is ( amp A ).

[@carlesjuliavallmajo3812]

Hi man !!! love your qualio speakers and i like even more your rewiews and your attitude to music and hifi , greetings from Barcelona ( temporally in France ) , take care !!!

[@VirtualHiFi]

Thank you very much ;) I highly appreciate your comment. Stay tuned for more content to come ;)

[@shunpillay]

Excellent video. 👌 I appreciate all the work that you’ve put into this video.

[@VirtualHiFi]

Thanks for sharing your opinion :)

[@RobWhittlestone]

EXCELLENT COMPARISON TECHNIQUE! What a lot of work! First I liked A (Sparkos) over C > B, Second I liked A (Muses) > C > B. I correctly identified the Naim Supernait.

[@shinnoskenohara7037]

Great work!!! Thanks!

[@ignaciourech8083]

The video is great, I love the enthusiasm

[@LoftyVisions]

Great video as always, thank you👍My finger was hovering over the Kickstarter button for the V3 mono, but after this review i dont see the need to part with with my dual mono ZA3s wirh Sparkos. I like the versatility of the ZA3 more, and i didn't think the sound of the V3 Mono was an improvement tbh. That and the need for two opamps per unit, the changeover is a bit too expensive

[@marcellusmilton6296]

Thank you for making this excellent video. The amp comparisons are awesome and it sounds great through my Verum 1 headphones.😀😀😀😀

[@VirtualHiFi]

Thank you for your great feedback. Glad you enjoyed it ;)

[@Hitsujiomeguruboken]

Increadible work of you! No bla bla bla! Subscribed!

[@VirtualHiFi]

Thanks and 😁

[@alexanderk8135]

AMAZING REVIEW!

[@kattarhindu451]

You're very fast. Thanks!

[@1984nadrules]

My pleasure ;)

[@DSor1]

Awesome work, and thanks for the effort you're putting into this and for the descriptions. Hopefully one day I will be able to move to a space thst alllows me to fit a set of your gorgeous speakers. I bought the V3 monoblocks and considering your comments regarding the sound signature of the Sparkos, would then perhaps be Staccato an interesting fit for the V3s? I can't remember if you ever tested Staccato with the ZA3. Thanks in advance!

[@VirtualHiFi]

Hi, thanks for sharing your comment. Apparently I tested the staccato with V3 for a moment and definitely preferred sparks for the energy and muses 02 for richness. So I have to test it some more ;)

[@stfnphil]

Excellent review with very useful audio illustrations. I could tell the higher degree of brightness of the V3 Monos with Sparkos op amps. I was wondering whether V3 Monos with Muses02 was much brighter than A07 Max. I have two A07 Max with Muses02 in Mono, and they sound great. A bit on the dark side, which I like, but I could use a bit more detail and soundstage.

[@mohdferdausmustafa9739]

Muses02 in single mode or dual mode? can it works in A07 max?

[@sweetsansui2829]

Great job you've done there. What preamp would you recommend to match the v3 mono?

[@AlanFenick]

I really enjoy you channel! Feel comfortable with your recommendations! I purchased two V3 mono amps with the 48v 10amp power supply and the splitter cable on the FOSI Kickstarter site! FOSI stated they will ship in June 2024. Will follw your recommendations for the OP amp switch out! I subscribed also!

[@bayard1332]

Great vidi. In my rig I can change DAC opamps, I usually use the sparkos somewhere and mix balance with Muses02 or Muses 01. These days I tend to prefer the Muses 01 over the 02. The Muses 01 is in the direction of the Sparkos but less intense, less driven. Cheers.

[@Mikeymikemike]

Hi, thank you for all your videos. I’ve watched many hours of them and got most of your playlist too 😊. Since you are the only one who has had both. Can you tell me how the resolution and bass response of mono compares the kinki studio M1+, you may not have the amp any more but which one gave you more “impressive” factor in the sound and performance. Money aside. Many thanks

[@terrykemp8131]

Looks and sounds good. Some reviewers have said that when using a splitter there was noise in the speaker. As the V3 mono's have a small enclosure, I would be afraid of over heating over time.

[@VirtualHiFi]

I didn't notice any hum with the speakers at all and my speakers are super revealing. I am using a separation transformer though for my power strip.

[@FoodieDrinkie]

I have the monos on order and they arrive soon. I specifically asked Fosi prior to choosing which kickstarter option to choose - they confirmed there is NO sonic benefit from running the monos using 2x 10A power supplies compared to using 2x 5A power supplies. I therefore chose the smaller power bricks as they are physically easier to get out of the way. The larger 10A power supply is intended for running 2x monos from one power brick, there's no other benefit. Nice vid btw!

[@FMedical420]

Cant wait to get mine :) and my 1 muses chip XD Cool content cheers for the video.

[@VirtualHiFi]

Have fun! And thank you for your comment ;)

[@julienwicker7396]

Congratulations and thank you for all the fantastic work you do. You make the best videos on the subject, the most "objective" for my taste (although without digital measurements ;-)). I have the muses01 at home on an A07 48v and I prefer them to the ss3602. In dual-mono, some put the OP only on the used channel and nothing on the unused one, arguing that this concentrates the signal better. What do you think? For my next upgrade, I'm considering upgrading to the GUSTARD R26 and dual mono; probably the V3. Best regards 🙏🏻👍🏻😉

[@jukingeo]

This was definitely interesting and I mainly dropped in when I saw you were comparing a $5k and $9 amplifier to one that that cost less than $200. While I do have a decent computer sound system comprised of Cambridge Soundworks speakers, I am sure this doesn't compare to being in person. But I wanted to see if I can hear any glaring differences between the op-amp rolling within the Fosi amplifiers and (even more so) how the Fosi amplifiers compare to much more expensive amplifiers. Now, I will open by saying that I barely noticed any differences between the op amps. Perhaps it is something that I have to try on my own. Moving to the comparisons with the more expensive amplifiers, I picked amplifier "B", the Naim Supernait3 as my favorite. Amp "C" actually sounded a bit "duller" to me. However, I was shocked overall that the Fosi V3 Mono blocks were not far off in terms of sound quality. Granted, I KNOW my system does have it's limitations, but at $5000 and $9000 on the two high end amps, I was expecting much more. Even on my system, I figured I would ear a VERY noticeable difference. That being said, this experience did reinforce my thoughts on high end, high priced audio and I come to the conclusion that it isn't worth the price. You are FAR better off with the Fosi amplifiers on a decent set of speakers and saving that $5000 or $9000 for something else. As it is, I feel that would be the cost for a whole system respectively. It is a fact that the higher you go in price, the less the improvements will be. It is the Law of Diminishing Returns. I am sure the builders of those high end amplifiers, it probably cost them about $1000 and $1500 to make them, and everything else is just markup for the middle man and the troll manufacturers that built them. In the end, you only get something that is marginally better than something that cost 10 times (or even more) less. I have found that the realm of hi-end audio is a realm where it increasingly is the case where YOU DO NOT get what you pay for. In many cases, you overpay. This is especially true with speakers. I had recently seen a video, where a fellow pulls out a cheesy crossover worth no more than $50 out of a $6000 speaker. The side walls weren't braced either. I come to the realization that I DON'T need to spend more than $5k or even $3k on a decent sound system. When I see prices of $100k or more on speakers at these high end trade shows, I just shake my head. The profit margin on something like that is enormous. All it is is a troll manufacturer trying to "steal" as much money from the consumer as they can get. So you know where they can stick that 100k speaker, right? Yes, right up where the sun don't shine! The proof is right here. You can get a decent amplifier for less than $200 and it will do the job nicely. Great video! I enjoyed this very much!

[@geevee1045]

I imagine that the better your speakers or headphones, the more evident the differences will be. Just my 2 cents worth.

[@johnpeterson99]

I like this video very much! Thank you! Listening with my ikko OH1 and qudelix 5k (custom EQ) I completely agree with your op-amp evaluation. I could hear from the first track that C was not my favorite. A and B were hard to distinguish, but I thought B was an ever so slight improvement. Authentic treble and a slightly 'wetter' or fuller overall presentation. The stock op-amps smear the treble, and the music feels flatter to me.

[@VirtualHiFi]

Thanks for sharing! Giald you find the video helpful. :)

[@richh650]

I preferred Amp B with muse02 in the first sample over the slighter hotter Amp A, with C in last place. Midway, I preferred Amp C which was the Canor amp as it just sounded, right and not exaggerated, compared to the others. The last samples were close with the Sparkos op amps just being a little bit hotter. I know YT really damages audio by using extremely low lossy audio bit rates but that was my impressions. Tough to know how a Class D amp will react with a speaker with certain impedance variances, as most Class D's tend to have a hard time playing linear output with music playing on reactive loads. Great Job as I know these sound tests are very time consuming and your efforts were excellent! Bravo !!!

[@warrenspicer7153]

Super interesting and I always appreciate your reviews and comparisons so THANK YOU! What I found most interesting is the V3 Monos vs Naim vs Conor. Listening again an again to Wood & Skin, each time focusing in on a different piece or pieces of the drum kit, I found the Nait to be more real. That is to say that I really feel the hi-hat and get a sense of the travel of the cymbals of the hi-hat before they clap together... feels real, I can "see" the hi-hat! Same with the multiple drums that are Not the snare, I get a sense of the physical volume of each drum and the resonance of the wood... seeing them... fascinating! Again, it feels real. Lastly with the snare drum, I hear very LITTLE difference between the amps. I think it's because the snare is skin, spring and mettle, and I think it levels the playing field between the differences of the class of amps. I've never read a clear explanation of what creates PRAT (pace, rhythm and timing), but I think that has something to do with what I'm hearing (and seeing!) as Naim is known for PRAT above everything else from what I know. It's too bad I can't see affording a Naim anytime soon.

[@VirtualHiFi]

Thanks for sharing. Indeed Naim Supernait 3 is a great integrated amp and I bought it for a reason :) I just sold mine so I'm sure if you hunt for one someday you'll find it at a great price pint.

[@torus186]

These are fantastic videos to help you listen for differences in musical presentation and the commentary after is really informative, great channel many many thanks. Preferred the SuperNait in the 2nd test, lovely richness and smooth. Quick question - Which resistor are you using with your IQ's?

[@VirtualHiFi]

Thanks for sharing. With the Fosi ZA3 I tend to use 1.8 Ohm and with the V3 mono I switched to 2.7 Ohm Ones ;)

[@bentleygt3716]

great demo.. i don't know how you do it ??. takes a lot of efforts to make a video like this !.. so THANK YOU for that. i am perplexed how good the FOSI sounds compares to other pricey equipment. the difference in $$$$$ is HUGE. we're talking pennies Vs Thousands of Dollars !!. on a side note. did you have a Exhibition room at the 2024 AXPONA over a week ago??

[@VirtualHiFi]

Glad it was helpful! Yes that is entire point of it the TPA3255 is amazing chip and it can compete with really big boys I had those amps against true giants and well it was either or depending on the preferences. So going for that silly chip amp allows to invest money elsewhere like for example stunning DAC ;)

[@willyhaug549]

Thanks for your informative and credible review, helps a lot. Do you know anything about the difference between Muses02 and Muses03?

[@bjmarchives]

For Klipsch speakers with horns, should I keep my ZA3 (mono set) or try v3 mono?

[@Eron55555]

Would be nice to see a A07 max comparison.

[@supabayes3284]

Very useful review and great sounding video. I like the v3 mono with sparkos op amp best. Glad you made the switch to T+A DAC200. It is amazing dac. Looking forward to getting my v3 mono. I have another TPA3255 class D amp that I like very much. The LSA Warp 1. It will be interesting to compare them. How many pieces of Sparkos op amp do I need for each mono? Thanks

[@meddlepf]

2 op amps per mono.

[@user-ml8qr3ch2u]

When the 2nd 10A/48volt brick finally arrives, I would really love to hear demo's of the Fosi V3 mono's totally maxxed out with the new Burson V7 Vivid Pro, Sparkos SS3602 and Staccato OSH-DHb opamps. This would be the perfect chance to hear these high end opamps performing at their maximum potential.

[@VirtualHiFi]

Thanks for the comment. I am waiting for the PSU brick, and I tested the staccato and was not initially very impressed in this V3 amp. Will do ab opamp wars and release my video n about a month ;)

[@dwaynepiper3261]

I picked the Fozi v3 mono in all tests. The original V3 was close. For some samples I prefered muses others sparkos depending on frequency content. Muses for low end drums, sparkos high end female voice. The best comparison reviews on youtube with proper equipment. Thanks for your efforts. It would be interesting if you mixed muses with sparkos in the V3 mono, the combined qualities of both would be close to perfection. Would they compliment each other or the opposite?

[@billkabb]

another excellent review. I agree the muses02 sounds the best. since you have the muses02 now could you please test them on the aiyima a07 max and give us your opinion ?

[@AllHandlesHaveBeenTaken]

I compared Muses02 with opa2604 on my A07 MAXs in mono mode and found the Muses02 worked best. I have 4 A07 MAX in a bi-amp setup. I have the Muses02 on the midrange/treble and opa2604s for the woofers

[@tonym8358]

​@AllHandlesHaveBeenTaken I sold my Fosi V3, Aiyima07 Max sounds much better, now the question is 2 Aiyima07 Max or 2 Fosi V3 mono. I jump on the Kitstarter campaign and will have to wait 2 months

[@christopherorman5769]

Thanks for this, though I often believe that such sound comparisons are only as good as the equipment I am using to listen to it. I am, for example, not inclined to think my Thinkpad P51 has the dac or output that is adequate. I think I would need to be in the room to "get it." Saying that, 5 years ago, I would have scoffed at the idea of 2 monoblocks, 100 watts each (8 ohms), with XLR and the performance shown at ASR costing $220. If you go to ASR, check out the amps this competes with. Absolutely bonkers. That hi-fi can be this good for that price is stunning. In fact, those hearing defects, I would bet, are hearing weaknesses in their source material, their speakers, or their chain at this point. Mindblowing, really.

[@willyhaug549]

Hi, I assume you are using the XLR inputs in this test, but I am very curious as to whether you hear a difference when you use RCA? Have pre ordered these with each 10 amp

[@VirtualHiFi]

Yes for the test I used XLR and with XLR you can expect more conrol and dynamics, and with RCA more organic richer sound.

[@gigiterzolo1354]

The best amp tested in this video is the FOSI V3 MONO + Sparkos 3602. With other amps, the musicians performed poorly. A guitar player hit a wrong note more than once. Jokes aside congratulation on the video.

[@kdomster9141]

I would test it with discrete power supply adapter for each amp for full separation and than on shared PS to test the difference

[@impuls60]

Amp C sounded the best through my own diy tpa 3255 Amp^^. I have diy horn ribbons with a neutral sound. I got too much 4-7kHz lift with the other soundclips.

[@grogmonster2408]

What about the SMSL A300 ? Similar price etc but more watts. 330 watts in BTL mode. ASR review.

[@aeon7748]

Just bought a Za3 a few days ago, "That screws up all my arrangements." :)

[@D1N02]

Strangely I tended to prefer the stock op amp and then the Muses and Sparkos last. Don't know what was going on there... lost in translation? (oh well, forget that, my ears were clogged from the stupid covid.)On the second comparison left and right channel were switched on the Naim (or on the two other ones) I was torn between the Fosi and the Canor. Naim was really the least one. On the third test I think the three mono ones were great, but this time somehow preferred the V3 mono with sparkos. (but I cheated there). You still try to improve the power supplies using a fancy power cable instead of the supplied ones.

[@przemekmarciniak8007]

I had the same preferences regarding the op amps. NE5532 has really nice tonality. It lacks of quality (resolution, soundstage), but that's difficult to hear even in a good youtube recording.

[@garlys3417]

Nice video, as usual. I'm still wondering whether to spend thousands of dollars on an amp when these little boxes do such a good job. I'm sticking with my tweaked ZA3s, the V3 mono is not a real mono, even if it plays well. Have you tried the ZA3 with the 10A power supply? And also take the opportunity to change your 2 x 63 V caps, it's really worth it. Great pleasure watching your videos.

[@KXP70]

How are the V3 monos not real mono?

[@OldMeloman]

Honestly, I don`t hear much difference between amplifiers. So I left my V3 with OPA2604 OP amps for some more time.

[@justasimplefox]

Thanks, this review looks like a lot of work 😅 I definitely hear more ´energy´ from the Fosi compared to the Naim and Canor, hard to say if this energy will be not to much in the long run..

[@MrSumancherry]

When Fosi will be up wtih Gan mosfet based monoblocks ?

[@flyindo]

which op amp(s) do you advise to add a little warmth/smoothness, improved soundstage, little bit more emphasis on reverb to the sound without losing clarity/fidelity/details?

[@VirtualHiFi]

try the LHY or the parallel Ne5322 ;)

[@flyindo]

@@VirtualHiFi Thx for the reply. Never heard of those op amps and i think they are not supported by the Fosi Audio V3?

[@muzzargh]

Ok, not sure which opamp is which as yet but at this stage I find minimal difference between A and B, C seems more airy and bright..... So I'll be getting some Muses 😊 Couldn't really tell the difference between the A, A/B and D amps, I must have $100 ears. The last test I liked B the best. Awesome review, subscribed!!!

[@VirtualHiFi]

Thank you very much for your vote, subscription and time you put to this comment. I'm sure you'll find more interesting thinks here ;)

[@francislai5270]

Thanks, you are one of the only that gives demo sounds comparing new V3 monos with older Fosi. Guys, Isn't Amp B, C and D too harsh for any of you? The Sparkos Op amps and the new power the Mono's bring opens everything up ~ but for me it's like it blows the roof off the house, there are no limit to the high frequencies and it reveals the brittleness and distortions. I don't enjoy the raspy sounds of the hissing and H or Ssss sounds of the female vocals, I don't think many do. IF i had to just go off this video's demo i would go for Amp A for the more relaxed top end OR pair with less revealing speakers. But even Amp A at louder volumes is not relaxed for me. I dunno, what do you think? I won't know for sure until I buy a pair and try them out on my setup and listen to it live. But from this video, I'm not too impressed with the amp sounds.

[@VirtualHiFi]

Thanks for the feedback. It's definitely brighter and not as universal as Fosi V3 stereo amp. If I were going for the monos, I'd definitely go for the muses 02 opamps

[@JRadian]

Glad I'm not the only one who prefers Fosi V3 with Sparkos over others. With less top-end prominence, vocals come across more intimate and richer IMO, closer in "color" to my 300B, 2A3 SET's.

[@robertjermantowicz-uw3iw]

This Fosi V3 Mono with the 48 volt power supply is a remarkable amp! Lookout manufacturers of five-figure amps! For $280 you get a state-of-the-art amp sonically equal to those $50K made-in-Switzerland amps! I am not kidding!

[@flyindo]

Interesting. I have doubts now. At first i was determined to go for 2x Fosi Audio V3 mono amps. Mainly because of the small size, not needing/wanting a volumecontrol and auto setting. Plan was to get those and pair them with the upcoming Wiim Ultra as a pre amp/streamer and perhaps adding a SMSL SU-1 external dac (if needed). Currently i have a Fosi Audio ZA3 (on test) together with a Wiim Mini and a SMSL SU-1 dac. My speakers are Dali Ikon 1 mk1. Im coming from a NAD C700 but this setup comes (very) close. To be honest i find this setup (with the ZA3) to sound very good and have doubts about getting 2x Fosi Audio V3 mono amps. Will it sound better then the ZA3? I also read the V3 monos get kind of (real) hot. The ZA3 does not get hot, only a little bit warm at most. Maybe adding a second ZA3 and run them both in mono mode and pair them with the Wiim Ultra also sounds like a good option for me. I'm keeping the SMSL SU-1 anyhow just in case i want to add it if i'm not satisfied about the sound that the Wiim Ultra and Fosi Audio amps give. What would you (guys) advise?

[@vladimirjovanovic2803]

Hello. Are these pre-production units? Did you get them in for a review, or you managed to purchase them already?

[@VirtualHiFi]

hi. I got them for review over a week ago directly from Fosi.

[@vladimirjovanovic2803]

@@VirtualHiFi Thanks for the answer! So, probably it's going to be a considerable wait time for us non-reviewers. It seams that the V3 monos are worth it, though

[@matytinman]

The differences have been reduced compared to past videos. I prefer the sound of MONOs but... * Fosi V3 mono with Muse02 * Fosi ZA3 mono with Sparkos 3602

[@michau_12]

I never use earphones, only listen through speakers. I use Arylic S50 Pro+, Fosi Audio E10 PRO amp (connected through Opt cable) and home build speakers with Visaton MHT 12 (High-end tweeter-range magnetostat), G 50 FFL (2" High-end fabric dome midrange), 2 x 6,5" Monacor SP-6/108PRO PA kevlar bas-midrange and 2 x 6,5" Dayton Audio DS175-PR (passive radiator) for deeper bass, easier to controle the bass. Also use 10" subwoofer (active) for the deepest bass in music and movies. I will try Fosi V3 Mono with Muses 02 . Thank you for your test for us.

[@larsstecken]

I don't know anything about Op Amps and what exactly they do. But I am interested in this product and wonder how many of these op amps do you need per channel? one ore two or even three? Thanks for the video and the comparison! 🙌

[@obudaifourty9]

Did you pay any attention watching this? 6:55

[@larsstecken]

@@obudaifourty9 Thank you for the kind response and I did pay attention, exactly to avoid such a response. It was not very clear to me, the way it was phrased. But do not worry, I did find the info already.

[@libertyss32]

So i am confussed about the op amp config. If i run one op amp for the xlr or change the 2 plus the xlr or what is the difference? Does it give different sound if i change one two or three? What are the changes in these different configurations?

[@VirtualHiFi]

If you don't plan to use XLR at all you can not bother, or remove it and keep somewhere safe. It will work with RCA without that Opamp. The 2 opamps on the front of the board are to be replaced if you want to have more fun :)

[@billarmstrong5568]

An interesting test would be between your Naim integrated and their new Nova PE Class-D. I also wonder if more expensive Class-D efforts, like the Java Single-Shot integrated or T+A's own A200 for instance, would be any clear step up compared to your Fosis?

[@VirtualHiFi]

Your wish is my command ;) We'll I'll try to do some nice test soon. I had no chance to record it recently but I remeber switching the FOSI ZA3 + Sparkos against D'Agostino Progression S350 and I'd choose the Fosi on every track I tested. Way better midrange, attack, resolution and just a little bit loose bass. The Progression had hammer like punch on the bass which might be a benefit for some. The Fosi was way more musical though ;)

[@billarmstrong5568]

@@VirtualHiFi Cheers!🍻 And I certainly agree that overall the Fosis sound superior to both the Naim and the Canor.

[@jhuneclarino]

Amplifier B sounds good to me it has body in the base or low frequency

[@VirtualHiFi]

Thanks for sharing your feedback :)

[@vonjuergen]

What is the minimum impedance of your speakers? The big question with class D amps is: Do they handle loads under 4 Ohms well? Do they double the power in 4 Ohm and 2 Ohm?

[@michaelwright1602]

The ZA3, one ZA3, powered my Magnepan LRS+ speakers without breaking a sweat, or any distortion. I would say they can drive most speakers out there.

[@tonym8358]

You answer all the questions, but missing one...V3 mono sounds better with Muses02 or Sparkos ss3602?

[@1984nadrules]

That's hard to answer and will depend on the system. I'd say they are not better but different. For richness Muses 02 and Sparkos gives plenty of punch dynamics and holography but overall balance of the amp gets somewhere on the brighter side of neutral. So best will depend on the system here 😊

[@joshdeakins1775]

Before you spend a bunch of money on the muses 02 or sparkos check out muses 8820D you can get them for around $10 each. I can't give you a direct comparison of the 02 vs the 8820 but I can tell you I'm very impressed with the improvements the 8820 brought to my za3's. And if I was to describe the 8820 it would be a similar description you hear for the rest of the muses line. Warm analog like.

[@janbuker8722]

Very nice comparison. 👌😎 Could you compare the T+A A200 against the Fosi V3 Monos. I have the same outcome than you👍

[@D1N02]

Maybe it is possible to use two different opamps so you get a mix. You could tune it to taste. Of course the same combination in each amp. I had good results with a combination of opa2604 and opa627 (one warm, one crisp) in a little tube buffer. Because one was on the volume dial and the other on the bass and treble dials.

[@VirtualHiFi]

Hi, yes it's possible and one can definitely try since nothing will blow by doing that ;)

[@ayewhite333]

I thought the Muses 02 op amps sounded the best in most samples! Thanks for sharing

[@VirtualHiFi]

Thank you for sharing your comment ;)

[@adrian.parker]

Hi, did you try to bi-amp on a single speaker? I have bought two sets to bi-amp my speakers and wonder if that will make a difference?

[@VirtualHiFi]

Yup I'm doing biamping experiments now and it's definitely worth experimenting ;)

[@adrian.parker]

@@VirtualHiFi cannot wait to hear the difference. Hoping great dynamic range as a result. Also please nail down exactly what opamp swaps make sense for Bi-amp with XLR input, which opamps on which amps (thinking that only the mids/tweeter need opamp swap - but could be wrong, bass too?). And a question, how much difference does a single opamp upgrade make (Sparkos) per amp, they are too 'rich' to flip all opamps (12 a set of biamps), so would be good to know which of the two opamps and in which amps make the biggest difference to switch. Which to do first, then second.

[@patricaomas8750]

So this is only on Kickstarter?

[@FFrrEEddRRiiKK1]

Any reason to go with a 10A power supply/V3 mono?

[@RodrigoEMacedo]

Good demo! Fosi is good but its dry/trebly sound that doesn't get closer to hiend amplifiers. Canor >> Nain > Fosi.

[@VirtualHiFi]

Thanks for sharing ;)

[@AdamsOlympia]

Does it run hotter than ZA3? My ZA3 is lukewarm after using it for hours. My iPad Pro gets 3 times as hot to the touch.

[@VirtualHiFi]

yes it's definitely hotter. it's half the size of the za3 so it will definitely run hotter ;)

[@jayem1826]

@VirtualHiFi Wish I could have been your ESL instructor. We both could have learned allot. 😊

[@kaolim7282]

I still wonder for op amp rolling that if we can pair the original 5322 opamp with the spartakos. What the sound will be

[@VirtualHiFi]

I am working on the PCBs for mixing any 2 opamps in parallel so who knows ;)

[@redleather100]

Amp b was wired different to A and C channels switched on test 2

[@voltagetoe]

iirc the NE5532 has measured flat and clean with these. if it doesn't sound right, then there's something wrong with speakers, room acoustic treatment, or the listener has a special taste.

[@VirtualHiFi]

Imo Measurements of electronics say absolutely nothing about sound character.

[@junsun95]

Buying a TPA3255 amp with $140 is insane. TPA3255 module only worth $15. Then the case worths over $100? What so called PFFB is just a few caps and resistors suggested in the TI datasheet.

[@VJA74]

Session 1: A best, then C. B seems subdued (lifeless) Session 2: Quite close but still C, A, B Sessio. 3: very difficult but still I think A ,D, C, B

[@naren.freak1c]

Center image is not in the centre,everything is shifted to the left. Is this how it's supposed to sound? Every track sounds that way

[@joshdeakins1775]

Anyone interested in op amp rolling id suggest starting with the muses 8820D. its not talked about but should be! Im very happy with these $10 chips ❤ they tame the za3's highs down. Makes them more warm and analog like, as most people describe the muses 02. I was hoping to add the sound signature of my late cd player(pioneer BDP-51) that had the jrc5532 in the analog stage and it did just that. Awesome what these little chips can do😊

[@Nefty_]

V3 Mono with Muses or ZA3 dual mono with Sparkos? What do you prefer?

[@VirtualHiFi]

I have to listen some more time since it's an equal level. The ZA3 has a little bit more muddy midrange but is darker sounding, while the V3 mono is more open, clear and has better overall vocals but is brighter in balance. So it all depends on preferences and system. It's not one is better. Which one is better will depend on the system ;)

[@Nefty_]

@@VirtualHiFi thank you, this what I thought as well when listening to your video. More different than better. However the fact that it needs to be calmed down with less revealing op amps I don’t know. It’s definitely on the brighter side of things

[@paolobonfanti1194]

But with the Qualio did you like the ZA3 with the Sparkos or the new VA3 mono with the Muse 02 better?

[@VirtualHiFi]

I like both :) The ZA3 and Sparkos seems to be easier to configure for sure. the V3 mono is more open and while it has better midrange overall in my opinion the ZA3 is darker sounding and the system gets defnitely richer with it. But I'll listen some more and will do a LPS for both amps and will report on the progress in about 1-2 weeks ;)

[@russellparker4568]

But what preamp are you using with these mono blocks?

[@VirtualHiFi]

At the moment I'm using T+A DAC 200 built in preamp

[@russellparker4568]

@@VirtualHiFi Woah! Serious piece! Very nice.

[@JRadian]

FYI I just realized that Fosi V3 Mono is the only one with balanced internal design, but this means it uses the third op-amp by input to convert RCA inputs to balanced. Fosi ZA3 is not balanced internally, so the third op-amp is used only when XLR input is used. So if one has non-balanced system, it may be better to go with unbalanced amp.

[@yttean98]

Thks for your review. Really, you said you can build a new system using FOSI amps to highend system, I do not think so. Possibly transform a normal/average sounding 10-30 year old integrated amp to another sonic level. It's commonly known that changing amps do not make that much different(only nuances) in a high quality home system, I don't mean high-end system.

[@VirtualHiFi]

Thanks for sharing your comment. You can definitely build high end system using FOSI or Aiyima with TPA3255 chip. It's dybnamic and open yet has a very natural and beautiful midrange. I listen to those amps against so many thousand and tens of thousand $ amps that I stand on my position ;) With proper speakers buying other amps might be costly and pointless.

[@jayem1826]

Only at the 23 min mark. Listening through Sabbath Ultra 16 BT earphones. The biggest difference I can hear is when c switches to a. I'll try again on my two speaker system and get back. Thanks Okay. I’ll try with my Sundara’s and Tone 2 Pro and let you know.

[@991carreras3]

I would expect just one opamp for the amplifier why is there two? Is this unit still not a true mono and it's still a two channel and they just turned one off channel? The mono amp looks the same as the za3 sounds like some Chinese trickery going on here.

[@D1N02]

on the ZA3 you need one op amp in mono mode. Here you need two because both channels are used.

[@dwaynepiper3261]

I think it depends on the sensitivity gain setting on the back. One or both are used based on the setting position if I am correct

[@istvanantal6848]

Hi! good video! testing v3 mono parallel ne5532? simple v3 best sound with parallel

[@VirtualHiFi]

thanks for sharing :)

[@istvanantal6848]

@@VirtualHiFi it would actually be a question :-)

[@D1N02]

with Wood & Skin - Hara Node I always expect tadadaa tata daa ta ta ta daa tata tada daaa (The A-team tune)

[@1984nadrules]

😂😂😂

[@user-nc8dc9ie4x]

How about the V3 or Za3 with the Maggie’s LRS?

[@michaelwright1602]

I have a pair of the LRS+, and the first amp I threw at them was the ZA3. The little Fosi did not even break a sweat, and drove them to clean clear and uncomfortable levels without distortion. My lone ZA3 has the Sparko op amps installed. It sounded very good, very detailed with pleasant highs, solid bass and pleasant mid-range, using my PS Audio Stellar Gaincell DAC/Preamp. The only thing missing was the 3D sound. The ZA3 was 2D, like every Class D amp I have had through here. But, it worked flawlessly with the Maggies and sounded darn good doing it.

[@user-nc8dc9ie4x]

@@michaelwright1602 thank you very much for the response… I truly appreciate it. I too the have Maggie’s LRS and know how difficult they are to drive. Guessing I will try out the the V3s with the LRS once they come out along with the Sparko OP amps.

[@michaelwright1602]

@@user-nc8dc9ie4x I want to try those V3 monos too. What I did do, was to break out my old first generation 800 pound Emotiva XPA-2 amp to power the Maggies. Now, I have that 3 dimensional room filling sound. Have you looked at the Schiit Vidar amps? I think I am going to pick one up here in the near future, they can be had used for between $400 and $500 on US AudioMart if you are patient. This seems to be the most popular Class A/B amp to pair with these LRS and LRS+ speakers. If it does not sound to your liking, they are easy to flip. If one works for me, I will pick up a second and go mono with those.

[@user-nc8dc9ie4x]

@@michaelwright1602 out of curiosity… how hot does the unit get… I ask because z reviews reviewed the new V3s and stated they were smoking hot

[@michaelwright1602]

@@user-nc8dc9ie4x Honestly, after two hours of comfortable listening, it was just slightly warm driving the Maggies. Not hot, just warm enough to let you know it was working. That really impressed me, I thought it would be pretty hot, not even close.

[@archstanton1628]

As expected, they all sound exactly the same. Just get an amp that has the best features and build quality for your requirements. I'll stick with my Creek integrated, it sounds the same as everything else I have, but the tuner module is pretty awesome.

[@VirtualHiFi]

Sure thanks for sharing your feedback ;)

[@user-ju7wy7oc6x]

At the end of the day it's all about the law of diminishing returns.

[@johnlehew8192]

All of your amps on this video sound great with airpod pros. Not much difference. Op amp rolling is all you need to tune the sound from the amps to your speakers and room from what I can tell. The bass on all amps sounded the same. Mids were a little different, and highs had the most difference. Would like to know which amp provides the most soundstage.

[@dixter1652]

You should hear how they sound with a good set of Headphones... just be careful of the power....

[@1984nadrules]

😅

[@HaraldBergTechTv]

Fosi are ok for near field such as placed on a desktop. The amps breakdown quickly on listening lvl above 60 db when listening position is more than 2.5 meters or more

[@christopherorman5769]

Assuming your comment is not referring to past Fosi equipment and thus suggesting these will be the same, I think it depends on the system and speakers. I do not see using the V3 monos for home theater. To me, monoblocks shine in a two channel, stereo setup where detail and precision matter and you have very revealing speakers. I have a hard time believing, given the measurements and analysis over at Audio Science Review, that these amps breakdown as you suggest. In fact, from what I understand of these amps and the data I've reviewed, I would be inclined to attribute any breakdown to the following: (1) your speakers are seriously power hungry -- as these will be putting out 100 watts in 8 ohms -- which should be enough to run Vandersteens and things like that; or (2) your source material chain is of less quality than you realize and you are now hearing weaknesses in your DAC or preamp (which recently happened to me).

[@HaraldBergTechTv]

@@christopherorman5769 my mistake, I was referring to previous generation

[@9XThunder]

Za3 sounds more real !!

[@VirtualHiFi]

thanks for sharing ;)

[@degreesdegrees-jr4eg]

test it with regular car batteri