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Brief Odac impressions - Page 127

post #1891 of 2018

For me subjectively, its always a blacker background ,less "thickness" from distortion in the sound and more importantly, I get less listening fatigue. For example comparing this the UD110mk2, the ODAC to me sounded more similar then different from the UD110mk2 before placing in the isolator. Also it does not help that I have more experience with the ODAC losing lock easily over time or from changing sampling rates. All my relevant data cables tend to have ferrite beads installed, for my VGA monitor,.its on both ends.

post #1892 of 2018

Thanks for the fast reply...Interesting, I haven't seen any unlocking or changing or changing sample rates. This is usually setup in the OS, the ODAC doesn't have a separate driver, its 24/96.

 

I do have another vendors dac with sample rate lights still 24/96 and can change the rates from within the OS playback properties area in WIN 7 Pro. Never saw the sample rates change other than when I went in and changed them in the OS.

 

If I were experiencing these kinds of dramatic changes or intermittents I would look at my setup very carefully or get another ODAC and make sure its indeed not defective.

 

All the best

Alex

post #1893 of 2018

The results of course are repeatable with not just the ODAC but other usb DACs I have on hand like the measurement interface and the UD110mk2. Its just that the O2 has the most gain in supply isolation. Also the point of this exercise was to show that isolation can help out those whose chain may be susceptible to these faults but are unable to change out whole components to get a cleaner supply. The Lifebook without the VGA connected monitor is pretty clean and gets me the results that are expected. Mcandmar's experience with high speed PC and uber graphics matches those of some users I know.

 

It is also pleasing to note though that the production ODACs are measure better then the prototype on Voldemort's site.

post #1894 of 2018
Quote:
Originally Posted by adydula View Post
 

Thanks for the fast reply...Interesting, I haven't seen any unlocking or changing or changing sample rates. This is usually setup in the OS, the ODAC doesn't have a separate driver, its 24/96.

 

I do have another vendors dac with sample rate lights still 24/96 and can change the rates from within the OS playback properties area in WIN 7 Pro. Never saw the sample rates change other than when I went in and changed them in the OS.

 

That is normal because the windows mixer upsamples or downsamples whatever you are playing to match that setting, in your case 24/96.  For the best possible quality you want to by pass the windows mixer using a plugin like wasapi in Foobar, that way the dac with switch bit depth and sample rate to match the material you are playing, i.e. no up/down re sampling of the original material.

post #1895 of 2018

Agree that WASAPI is all that I use...

 

A.

post #1896 of 2018

The ODAC is driving me crazy. It jitters far too much - like every time I load a new webpage. Is there anything that can be done? Actually, I don't even know if that is the correct term. The music skips for a split second - clipping?

post #1897 of 2018
What is the ODAC connected to and in what way?
post #1898 of 2018

Foobar2000 > ODAC > O2 > LCD2. I've also got the chip needed for my wireless mouse to work in one of the USB ports.

post #1899 of 2018

Its not the ODAC......many people have these pops and clicks with many dacs like the HRT in the post below...

 

 

http://www.head-fi.org/t/593826/hrt-headstreamer-wasapi-woes-in-foobar

 

Its ususally buffers settngs in the player...

 

"It works perfectly in Foobar as long as you stick to direct sound and lets Windows manage the sample rate. But using WASAPI or Asio4All screws everything royally over."

 

Try a different player like JRiver they have a demo version.

 

Note it may also be your USB interface as well, try an external USB hub...does that help at all?

 

Take out the wireless USB mouse chip...try to isolate what is happening.

 

Alex


Edited by adydula - 5/2/14 at 5:56pm
post #1900 of 2018
I'd bet it's an underpowered USB stage.
post #1901 of 2018

And what about an usb isolator ? 
 

post #1902 of 2018

Could be, I have experienced pops and clicks with every dac I have tried on a variety of pc's.

 

Even when I was able to adjust buffers in the player to a lower millisecond setting and get one dac glitch free I found that

another dac of a different type / brand could have similar issues and require an adjustment here.....

 

In wose cases and multiple USB devices attached its often necessary to remove all USB devices or use a separate usb port and or hub.

 

A.

post #1903 of 2018
I've never had a problem with my Mac & ODAC.
post #1904 of 2018

That's a good thing!!!

 

Alex

:)

post #1905 of 2018

I had a really ghetto, but powerful laptop back in the days (anybody recall emachines?  :D), and headphone out was a disaster.  You can hear all kinds of noise, it was near the monitor.  The problem with laptops is that usb line or circuitry is probably unshielded and near sources that induces emi.  

 

I think the desktop should be tried also since there could be better isolation.  I use a desktop.  That is really odd that that measurements are showing noise from power line.  Does the ODAC have it's own regulator and filters or is it relying on USB power coming from the computer to be clean enough?

 

What I'm trying to understand is why do some dedicated DACs have descrete components?  If you look at the bigger DACs they use big parts, and it has it's own toroidal transformer.  I guess the descret parts willl eat up more power, and wondering if that's the reason for toroids.  Are toroids used for linear power supplies?  What makes the power supplies utilizing toroids makes them special, or why is it being utilized in the DAC?  For what purpose?

 

And, I thought the purpose of external soundcards or DACs were to isolate from internal noise, and to find out power supply noise is there. 

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