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O2 AMP + ODAC - Page 129

post #1921 of 3177
Quote:
Originally Posted by adydula View Post
 

Spend some time on the designers website and look at the design docs, spec and his plots.....

 

Alex

I did.... but I don't think I saw output measurements of the ODAC with different power sources. I might have overlooked it. Please P.M. me if you find it yourself. Thanks!


Edited by AsianBatman - 1/22/14 at 1:25pm
post #1922 of 3177

Thank you so much for helping me :)

I have another question, I use the cable AUDIOQUEST Forest here, it does not come with ferrite, someone already did a test and feel the difference using ferrite?

post #1923 of 3177
Quote:
Originally Posted by glunteer View Post
 

Thank you so much for helping me :)

I have another question, I use the cable AUDIOQUEST Forest here, it does not come with ferrite, someone already did a test and feel the difference using ferrite?

Quote:
Originally Posted by tdockweiler View Post
 

 

It's possible there is no audible difference with some headphones and the included cables 1 foot length. Not sure.

 

A good test would be to try to use a longer length (like 5 feet) and try many different headphones. A closed and very revealing headphone is best.

 

I wonder what would happen if you placed 10 Ferrite beads on a USB cable biggrin.gifconfused_face_2.gif

 

Sorry, I'm easily amused..

 

Wait! No audible difference, requires volume matching and blind A/B test. All placebo!

 

EDIT: I just switched back between cables again and it's definitely very audible. Less so on my Magni and open headphones. On my DJ100 it makes everything seem more congested and warmer, like the lower mids are more forward and there is less treble. If anyone tests this, try it with any music that's warm and has a larger soundstage. I tried some Tony Bennett recordings and "Buena Vista Social club". Recordings that can often sound congested on a very warm headphone are best.

 

I bet a good headphone to test the differences would be the M50 or a bassier headphone that has slightly rolled off treble. Even the HD-650 might do the trick.

 

What it sounds like is what happens I connect my Headphone amps up to a MOV based surge protector, but even worse. Same symptoms almost.

 

EDIT 2: I just bypassed my USB hub (powered) and went directly to my computer. I switched between a 1' USB cable with ferrite core and a 1' USB cable with. It's stupid easy to tell the difference.  This was with the DJ100 and Headroom Micro Amp and ODAC. Similar results with HD-650. I highly doubt there can be an audible difference between USB cables even without the ferrite core (I know the whole 1s and 0s thing).

 

Hey, maybe it's the gold plating degrading the sound!!! biggrin.gif Only kidding...

 

I think this has to be the most bizarre thing I've encountered in years.

 

 

I didn't see any benefit of adding a ferrite bead usb to my setup. 

post #1924 of 3177
Quote:
Originally Posted by AsianBatman View Post
 

 

I didn't see any benefit of adding a ferrite bead usb to my setup. 

I do not feel much difference when I switch cables. I think with ferrite would be even less

 

 

 
I asked out of curiosity :)
post #1925 of 3177

I don't think there are measurements comparing different USB or other power sources.

 

What you should be thinking about is how the ODAC was designed and does it meet the design criteria that that the designer was aiming for and that is a genuinely transparent DAC.

 

The O2 amplifier was created as a simple, low cost, minimalist design delivering 100% transparent performance into nearly any headphone. The ODAC takes the same minimalist approach to transparency.

 

One of the "several" areas that many people think that are necessary for high end DAC performance and or audio nirvana is the use of a elaborate and/or High Current Power Supply.

 

The ODAC disappears from your audio chain while using a PCs USB power supply.

 

Even if the PC's USB power is not 100% clean the ODAC circuitry is designed to handle that. Yes dirty USB power can degrade performance. The ODAC uses split digital and analog power supplies each with their own filtering and regulator. The analog supply has additional filtering and the critical reference voltages, and negative supply for the DAC chip, are further optimized.

 

I have tried several pcs of all kinds and brands and have used an o'scope to see the trash coming from the pc riding on the DC USB power...but the end result is it doesn't matter as long as the DAC can handle this junk and the ODAC does this nicely.

 

I have used powered USB hubs as well and I can not hear any detectable audio differences.

 

I would not sweat this at all...unless you have some real audible distortion or noise its not going to get any better or worse with most well designed USB pc power sources...

 

enjoy!

 

Alex


Edited by adydula - 1/22/14 at 5:20pm
post #1926 of 3177
Quote:
Originally Posted by adydula View Post
 

I don't think there are measurements comparing different USB or other power sources.

 

What you should be thinking about is how the ODAC was designed and does it meet the design criteria that that the designer was aiming for and that is a genuinely transparent DAC.

 

The O2 amplifier was created as a simple, low cost, minimalist design delivering 100% transparent performance into nearly any headphone. The ODAC takes the same minimalist approach to transparency.

 

One of the "several" areas that many people think that are necessary for high end DAC performance and or audio nirvana is the use of a elaborate and/or High Current Power Supply.

 

The ODAC disappears from your audio chain while using a PCs USB power supply.

 

Even if the PC's USB power is not 100% clean the ODAC circuitry is designed to handle that. Yes dirty USB power can degrade performance. The ODAC uses split digital and analog power supplies each with their own filtering and regulator. The analog supply has additional filtering and the critical reference voltages, and negative supply for the DAC chip, are further optimized.

 

I have tried several pcs of all kinds and brands and have used an o'scope to see the trash coming from the pc riding on the DC USB power...but the end result is it doesn't matter as long as the DAC can handle this junk and the ODAC does this nicely.

 

I have used powered USB hubs as well and I can not hear any detectable audio differences.

 

I would not sweat this at all...unless you have some real audible distortion or noise its not going to get any better or worse with most well designed USB pc power sources...

 

enjoy!

 

Alex

 
 
 
Very good your comment !
post #1927 of 3177


Base on the youtube link...I try with HD650 / K601 / HD800 out from ODAC/O2, 2.5x gain, computer vol max, my room is very quiet and has a relax atmosphere :) . The music is playing nice with the volume knob around 9h30-11, at 11 is really loud for me. Let's just say i don't have any hearing problem as i go to doctor not long before. :)

 

maybe you use tooooo difficult headphone to drive......like vintage AKG or HE6 ? That why you need too much gain like this.

post #1928 of 3177
Quote:
Originally Posted by conheo View Post


Base on the youtube link...I try with HD650 / K601 / HD800 out from ODAC/O2, 2.5x gain, computer vol max, my room is very quiet and has a relax atmosphere smily_headphones1.gif . The music is playing nice with the volume knob around 9h30-11, at 11 is really loud for me. Let's just say i don't have any hearing problem as i go to doctor not long before. smily_headphones1.gif

maybe you use tooooo difficult headphone to drive......like vintage AKG or HE6 ? That why you need too much gain like this.

Without sounding like an A-hole, I explained before that the cd and the ripped cd is the one that has the low volume. smily_headphones1.gif

The YouTube link is fine. The spotify is fine. The cup-string-cup-headphone out is fine. I am not hearing impaired. I'm 35 with perfect hearing except when the wife is talking. Then all bets are off. wink.gif
Edited by nabwong - 1/23/14 at 4:43am
post #1929 of 3177

that is clear now anyway. that why i ask for providing the link....bad luck it is the "loud version" :)


Edited by conheo - 1/23/14 at 4:48am
post #1930 of 3177
Quote:
Originally Posted by conheo View Post

that is clear now anyway. that why i ask for providing the link....bad luck it is the "loud version" smily_headphones1.gif

Haha no worries. Just joking. I wish the cd is louder anyway.
post #1931 of 3177
Quote:
Originally Posted by nabwong View Post


Without sounding like an A-hole, I explained before that the cd and the ripped cd is the one that has the low volume. smily_headphones1.gif

The YouTube link is fine. The spotify is fine. The cup-string-cup-headphone out is fine. I am not hearing impaired. I'm 35 with perfect hearing except when the wife is talking. Then all bets are off. wink.gif

 

Can't help with the selective hearing in regard to your significant other which seems to be a common problem ;-)

But for the interestingly mastered CD - why don't you rip it to wav or flac and normalize it in audacity?

 

Joachim

post #1932 of 3177
Quote:
Originally Posted by jring View Post

Can't help with the selective hearing in regard to your significant other which seems to be a common problem ;-)
But for the interestingly mastered CD - why don't you rip it to wav or flac and normalize it in audacity?

Joachim

Good idea. I'm fine with it. Makes the 6.5x seem useful. Haha.
Edited by nabwong - 1/23/14 at 4:19pm
post #1933 of 3177

hi,

May i know STANDALONE ODAC can directly play with ipad air > cck > STANDALONE odac > amp ? (without any usb hub)

post #1934 of 3177
Quote:
Originally Posted by Spidermeng View Post
 

hi,

May i know STANDALONE ODAC can directly play with ipad air > cck > STANDALONE odac > amp ? (without any usb hub)

 

The only connection the ODAC has is via usb. 

post #1935 of 3177
Quote:
Originally Posted by Spidermeng View Post

hi,


May i know STANDALONE ODAC can directly play with ipad air > cck > STANDALONE odac > amp ? (without any usb hub)
I've read that the ODAC works with the iPad, but I haven't heard anything about the iPad air. At least with my iPhone 4S, the power draw from the ODAC is too much and it doesn't work without a USB hub.
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