Cmoy portable headphones amp by BioScienceGeek

[@Brandon4EK]

I remember when I first saw the Altoids Amp- man that thing is so fresh... it's minty.

[@benfischer9540]

Why would you think the iPod's internal D/A converter is bypassed using that dock connector..? The signal out is obviously analog (i.e. already converted), because it enters the amp using a 1/8 cable carrying left, right, and ground. It's definitely not putting bits and samples into an op amp. The CMOY doesn't even have a D/A converter in it. It's all analog

[@WitheredAnge1]

5:01 No, it doesn't bypass the internal DAC. The dock still outputs an analog signal...

[@MrBlackBerserk]

If you use the dock connector you will get line out and that is still a Analog signal (5:00) , so u are not bypassing the internal D/A converter.However you are right that you will get better quality signal because the internal amplifier is bypassed. Great video though thanks.

[@dt1133]

Incredible thing is 10 years later apple sells a decent DAC for like 7usd and is the size of a 3.5mm headphone jack. Awesome.

[@rdaffon23]

Yes!.back to audiophile geekdom! Solid, informative, helpful review. I'm waiting for a portable dac/amp combo review/recommendation sub $200. Something where it does not to be powered by USB to keep the dac functionality.

[@vampire5003]

If you mean android smartphones, then yes it should work with any device that has some sort of line out or 3.5mm out. If you want to bypass the internal amp and DAC of your phone/mp3 player then try to see if they're is some sort of line out other than the headphones jack on your phone/mp3 player.

[@EclecticResearch]

I've always loved the look of the Cmoy, I'll probably pick one up one of these days. Thanks for the great video as always ^.^

[@Tangylives]

The cMoy design does have more power(and can drive stronger impedence headphones) than the E11. Ignore my previous statement about the E11 being a amp and DAC, I was thinking about the E17. I would probably get the cMoy over a E11, but not an E17.

[@shinyhunterlens]

Try linking them together with 3M Dual Lock when that velcro wears out.

[@satram9004]

just got my cmoy , and as u said i got all the extra chip. LM .... & AD .... CHIPS sounds really briliant ! by the way do u know the impedance and the Hz of beats wireless , can't see them anywhere ?

[@vampire5003]

no, try the O2, its like $20 more and it can even drive orthodynamic headphones.

[@TheQsanity]

Yeah, how are you doing with it? How much does it weigh? Would you guys recommend it for android players or phones?

[@adgomez99]

Hey, I was just wondering if this Cmoy portable amp would greatly improve the audio quality in my Logitech UE 4000's and 6000's? Or would you recommend another portable amp? Thanks for the great video too!

[@BARBELLS-AND-BUDS]

Hifiguy, which opamps did you choose, and which do you prefer? Also what headphones are you using with which opamps? Thanx.

[@GOTHEAT0]

thats crazy i just bought a bsg from biosciencegeek 2 weeks ago and its coming in about another day, how do you like yours? i bought it to replace my e6

[@MustyBandaidMan]

Hey know problem :). You'll be helping me make a purchase by making a review on the PA2V2 so thank YOU for considering it.

[@vampire5003]

Well I would bypass the internal soundcard on your PC, well I like the ODAC by JDS Labs and Schiit Bifrost. Another good DAC is the HRT Music Streamer 2. Look those up, they are great. I like the Schiit one because it doesn't need battery's like ODAC and it is upgradable and has a 5 year warranty.

[@tachumi]

which one of the OP amps do you like listening with? ever tried using the external power does it give better sound quality?

[@TTGxBUTCH]

Would I notice any difference while using these with a pair of Shure SE215? They're monitors so im guessing not but I need some other opinions.

[@Tangylives]

Depends on who you ask. If you're just starting your journey into good audio, probably not(sub $150 headphones). A DAC just ensures that the digital music file is converted as accurately as possible into an analogue signal for amping and your headphone/speakers. The better the DAC, the better the conversion.

[@DannyLabrador511]

Hey, I have a pair of Sol Republic Tracks HD. You think this product would benefit me??

[@DannyLabrador511]

Thank you for replying so quickly... I found this other amp on ebay from another seller, with the same Opamp 2227 chip. You think it would be just as good?

[@watermage90]

sorry to ask another question but i was wondering is the whole Dac part worth the extra cash ?

[@BlvckTV]

i want to buy these for my sol republic ultras will they boost them without distortion or head spiking electronic sound?

[@satram9004]

i'm using the beats wireless and planning to get another headset for clarity , plan to get the cmoy , which chip u recommend .

[@necruda]

Would a beats pro need this amp to get the most out of it. If so ways the best chip?

[@sid12345678910]

you should take a look at the objective 2 amp made by nwavguy, its said to beat many other amps above its price comapring to 1000$ amps for 150 less price tag

[@austball13]

Would you recommend this amp over the CMoy design offered by JDS Labs? Also, what opamp would you recommend for the AKG K240s? Thanks!

[@BlvckTV]

thanks. How about a cheaper amp like one in the fiio series (e6). My phone doesnt drive these loud at all so would those make them a little louder?

[@916DegreesNorth]

ODac dosent need batterys, it runs off usb power, O2 dosent need batterys but it has, You switch the 2 batterys in the O2 with the Odac, fits right in there. awesome for value 285 usd but worth over 1000 usd compared to 99% of all the other companys. funny how that works :P

[@TheRealest365]

One more question , will it eventually blow out the speakers on the solo's ?

[@lukecage99]

Would you say these are better than something like fiio e7?

[@CJ-le3gq]

will this increase the bass in the MDR XB1000

[@andyj34]

Apologies if this question has been asked before but how easy is it to replace the 9v battery when the original battery expires?

[@costellom5]

From what ohm value should you start using a headphone amp with your phone?I wanna get a pair of MDR-10RC(40 ohm)

[@bertie439]

Is that an Agent 18 case on your iPod classic?

[@acemace3618]

I saw the thumbnail and thought you made your own altoids survival tin...

[@brianchia]

what's better? bsg or jdslabs

[@inderjitgosal7150]

Can we get beats wireless with no monster branding in Canada

[@cccpkingu]

It doesnt buypass the _internal_ DAC. O2 amp is 150$ shipped.

[@phototristan]

Do you play lossless files with this setup? Or iTunes plus?

[@lokilowkey1]

Anyone know what you need to get more out of sennheiser hd 558s. Would it be better to go portable or invest in say a sound card for my computer?

[@watermage90]

would you recommend these over the fiio e 11s?

[@pulidoworkz6777]

im planing to buy a porta headphone amp. in my country only the fiio andes e07k and fiio alpen E17 is my choose what would you refer for my headphones i have xb500, xb1000 and xb 900 please help me please reply

[@Alexoneill77777]

What is the best chip to get for the audio technica ath m50?

[@Jasonvg]

Do Beats by Dre Pro make a Sound/Volume difference?

[@TheRealest365]

Does this work well with beats studios ?

[@NOah8381]

Do they work for androids?

[@Hehhehha]

Sorry how would this do with an hd600

[@Allendog05]

What op amps where there and what did you like the most? I just got a cmoy amp from diyourfaceoff and I popped a jrc4558D that I unsoldered from an old amp. I liked the sound better than the BB 2134PA. Just curious what else I can use to tailor the sound. Thanks

[@syn010110]

4556/4558 will of course sound better because they're specifically designed for headphone use. The expensive opamps these builders like to use are "trendy" but they are not intended for audio use... so they sound worse. Just use NJM4556AD and you're pretty much golden for basically any headphone ever. It's $0.73 from Mouser.

[@Allendog05]

Thanks a lot!

[@Tangylives]

Quick google...wow, they sure came down in price since I got mine.

[@Hehhehha]

How would this do with.

[@juandv930722]

hey would you recommend this one for the hd25 and the amperior? thanks

[@megaskimming]

Still waiting for the review of the pioneer se-mj751!!!!!!!!!

[@TheRealest365]

By the way you have the best reviews

[@dylangarner7962]

Hi im 13 yrs old, and i have the sol republic master tracks. Would you reccomend getting this amp?

[@OfficialPaulReviews]

Hey man, i recommend getting the Fiio E11K pocket amp.

[@billyc3161]

Whay gen is your iPod classic?

[@BreyonnaMorgan18]

I just changed out a chip and the damn thing started smoking and broke. The chip did, not the amp. My amp is fine. 26AVHDM TLE2082AC. Don’t use that one.

[@Claw99FM]

Beats Pro need this amp?

[@TacticalMoistTowelette]

You should do a video once a week telling us the best pair of headphones on the market currently. That would really be awesome

[@TheRealest365]

Ok thanks

[@cocobutta5361]

What about the Audio technica m50x with these?

[@OfficialPaulReviews]

Dunno bout this one, however amps will clean up and provide better audio quality.

[@ChaoticaExtreme]

+PaulReviews Not possible. It's just an amp.

[@jazzjuke4218]

I have the 18v version 2 9v batteries it powers the Samson Z55's great but they are efficient headphones

[@voiceoftreason1760]

I might not understand this, but why not just plug in the headphones into the ipod? isn't that loud enough? i was looking for some DIY electronics projects and found this.

[@Pierrot110194]

Some headphones have a higher impedance which usually results in a lower efficiency. Impedance is the value of Ohms, which typically is 32 Ohms max for headphones used with MP3 players or smartphones. However, high end headphones have a much higher impedance and therefore require way more power than an MP3 player could provide. This is where a portable amp comes into play. You could obviously also use such an amp for your PC,TV or console.

[@voiceoftreason1760]

Peter Pepper mine are 38 ohm, so i don't need an amp right? also, it would seem as too much of a burden to carry a small amp around with your phone or mp3 player.

[@Pierrot110194]

Enhanced Pyrotechnics The only right answer to that question is: try it. If you think your headphones are loud enough then no, you won't need an amp.

[@VandalXXI]

It looks like an Altoids box...

[@watermage90]

actually their round about the same price for me on ebay :)

[@jimbutler5492]

damn this is fresh

[@nickvanelzen4630]

finally and amp that i can afford!!!

[@HimothyOHooligan]

Why would you change your opamp when changing a signal source. That's non-sense. If anything you would just need to change the input impedance. "He's not a manufacturer that drums up these thinks to make a profit". The dude's selling beginner DIY level hobby pre-amps in altoids tins for $50 whereas his bill of materials is probably 20 bucks max. The circuit is put together on perf board for fuck sake.

[@Headphoneaddict]

Time to get another job! :P

[@darkhero101010]

i have the same ipod case :)

[@rkan665]

this one looks better lol, people will be like what da foe

[@Zech-ij8jm]

at 50 dollars you could just get a fiio a3

[@jazzjuke4218]

I have an A3 and depending on what op amp you use in the Cmoy it blows away the A3

[@estebanvillalobos2303]

it's like $12 in parts

[@BreyonnaMorgan18]

It’s name branded.

[@hobonoob5000]

@someguy6481 I'm interested! Just comment back how much you want for it.

[@VandalXXI]

LMAO it is an Altoids box haha nice

[@TheLukey21]

Less than $15 of components, sells for $50 and he is not doing it for profit. Ok

[@expandedidea]

That's not really true. Even if you are cutting corners, you still are buying 25 bucks of components. The parts in this thing are probably up to 30-40 as it looks fairly premium and it might have a BB cap but I'm not sure. Anyways, if anything, hes making 10 bucks per purchase.

[@TheLukey21]

I guarantee you there is not $40 worth in that tin, more like 10 at most 15 at the max.

[@Kabong30]

People sell things for a profit. Welcome to America.

[@syn010110]

Most of the "legit" cmoy builders on ebay overbuild them kind of a lot, so the parts cost is probably around $30 (maybe less if he buys in bulk). And this builder also never said it wasn't for profit, lol. You can build a perfectly fine cmoy (internals) for around $11 (less if you buy parts in bulk). There's really no reason to use these expensive opamps since they're not better than a 4556 (usually they are worse).

[@taiefmiah]

+TheLukey21 there's a channel with a tutorial on how to build with $10 link for components. (not including delivery)

[@shinyhunterlens]

word

[@mike365fly]

1:54 you're an Asian?

[@Camaro2014SS]

2nd!!