or Connect
Head-Fi.org › Forums › Equipment Forums › Dedicated Source Components › Brief Odac impressions
New Posts  All Forums:Forum Nav:

Brief Odac impressions - Page 128

post #1906 of 2018

One reason I can think of dedicated amp having it's own power supply with toroids and etc.. is basically what we are talking about here, decrease PS noise.

 

I doubt that the ODAC has additional power conditionial section, I think it's like any other usb components that rely on the 5V to be clean enough.


Edited by SilverEars - 5/3/14 at 6:20am
post #1907 of 2018

silverears....you really need to go to the designers blog, cant post links here and read all the design information that is published there.

 

Your questions are answered there in "spades".....

 

Take the time to read all the ODAC pieces....

 

Your assumptions are not entirely correct.

 

Alex

post #1908 of 2018
Quote:
Originally Posted by adydula View Post
 

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."

 

Alex

On Jriver 19, WASAPI of course, Directsound royally screws you over with the sample rate converter, it will convert everything to whatever you set on control panel, not exactly the idea of bit-perfect playback. Yes check them buffer settings, change from Wasapi Event to Push or whatever neccessary. Also what is the computer/laptop like? 

 

 

Quote:
Originally Posted by SilverEars View Post
 

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. 

Yeah but most designers do not take into account common mode noise because of it is there sometimes and other times it just isn't. Dedicated DACs use toroids in their power supplies mainly because of lesser EMI contaiminating the analog circuitry of the DAC,

 

Unfortunately or fortunately enough, I'm able to measure EMI from non toroidial transformers affecting various D/A or A/D devices I have at my disposal including the ODAC. My situation with this is more because I'm using a receiver to drive speakers and headphones though I imagine that(anyone can measure?) emissions from today's switching supplies used in desktops in conjunction in other circuitry may induce distortion as well. 

post #1909 of 2018
Quote:
Originally Posted by adydula View Post
 

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


Thanks. Increasing the buffer length seems to have fixed it.

post #1910 of 2018
Quote:
Originally Posted by sotto123 View Post
 

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?

 

The DAC is being starved of data, usually caused by something else hogging cpu time on the computer, or your machine is just plain out of available physical memory to buffer the data.  Its 100% not the DAC's fault.

post #1911 of 2018
Quote:
Originally Posted by sotto123 View Post
 

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?

If you don't have enough ram, try adding ram. 

post #1912 of 2018
Quote:
Originally Posted by SilverEars View Post
 

One reason I can think of dedicated amp having it's own power supply with toroids and etc.. is basically what we are talking about here, decrease PS noise.

 

I doubt that the ODAC has additional power conditionial section, I think it's like any other usb components that rely on the 5V to be clean enough.

 

Thats the main difference with more expensive DAC's are the dedicated power supply's, specifically separated digital and analog supplies.

 

You are absolutely right about the ODAC, its implemented as per the datasheet for the components and nothing more, hence the lost cost.

post #1913 of 2018

Ok, regarding the noisy usb power line, I ran across this product.

 

http://www.ifi-audio.com/en/iPurifier.html

 

Here is the discussion on it

http://www.head-fi.org/t/683778/350cad-herus-asynchronous-usb-audio-2-0-24bit-352-8ks-s-dxd-and-dsd64-128-2-4vrms-headphone-dac/135

 

 

At the science threads we think it's nothing more that L/C filter with choke.  So, I think you just have to filter the usb power line since there will be no signal going through the power lines.  Some USB cables come with choke, not sure if that will filter out all that noise. 


Edited by SilverEars - 5/4/14 at 10:20pm
post #1914 of 2018

One of my pet hates is fancy marketing blurb spewing out techno babble without actually telling you whats inside a product and how it works. The fact the notes section brings you to facebook just kills all credibility for me. It may work great, or it may just be a LED in a shiny box, who knows.

post #1915 of 2018

Does this device make your situation sound better?

Any more issues of any kind??

 

Alex

post #1916 of 2018

Here is an interesting issue i'm not having any success finding a way around, my ODAC has been hooked up to my machine in the same USB port forever.   I tried to plug it into another port today and Windows detects it, tries to install a UAC1 device and fails.  My motherboard has 10 USB ports on the back panel and 2 on the front of the case split between three different USB controllers and it will only work in the port it has always been connected to.  Makes no sense so it has to be a Windows/Driver issue.

 

Has any body had this?  I'm using 8.1 Pro x64.

post #1917 of 2018

Try uninstalling the USB stuff in device manager, reboot and try again.

 

Alex

post #1918 of 2018

Its not that simple i'm afraid.  Of the four USB dacs i have to hand three of them have the same issue, and one of them works perfectly in every port.  It seems Microsoft have broken something in 8.1 when implementing the USB3 driver stack :rolleyes:    ...i'll update progress as i make any.

post #1919 of 2018

Its really easy to uninstall a USB device in device manager and then reboot with only the ODAC connected etc and let the OS reinstall etc....

The ODAC is not a USB 3.0 device....but I have one connected via a 3.0 port and it is recognized ok, but its win 7 pro 64 bits...

 

Has it ever worked? Maybe try a system restore back to before the 8.1?

 

Alex


Edited by adydula - 5/11/14 at 10:44am
post #1920 of 2018
Quote:
Originally Posted by MikeW View Post
 

Got my Odac module in from JDS Labs, installed into my O2. Some brief thoughts :

 

Clean clean clean

non-offensive treble, but great resolution

tight, controlled, impactful bass.

resolution

dead quiet, silent

unforgiving

warm

detailed

easy listening

plug n play, no skipping, no hiccups, windows recognized instantly, and was good to go in ~5 seconds.

24 bit, with close to 20 bit resolution ~ software volume control becomes viable without loss of detail.

 

It's tiny! All SMD! can be used with any amp, would be a great module to include in your favorite DIY AMP to make it into an all in one.

I've only got a few hours listening, but these are some of the things that jumped out at me. More serious listening is needed.

 

Hi All,

 

From the above:

 

"24 bit, with close to 20 bit resolution ~ software volume control becomes viable without loss of detail."

 

This confuses:tongue_smile: me. What does it mean? Is my JDS Labs  ODAC a 24-bit or merely a 20-bit dac unit?

 

I remember that someone  on this site explained in very technical terms - I can't find it - that the ODAC was a 20-bit dac unit.

New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: Dedicated Source Components
Head-Fi.org › Forums › Equipment Forums › Dedicated Source Components › Brief Odac impressions