Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

PC Based Computer music servers, crossovers, and equalization

Asus Xonar St as bridge only...
Asus Xonar St as bridge only...
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Thread Tools Search this Thread
Old 11th September 2012, 02:53 PM   #1
n0vtz is offline n0vtz  United States
diyAudio Member
n0vtz's Avatar
Join Date: Aug 2012
Location: Iowa
Default Asus Xonar St as bridge only...

Hello, This is my first post here.

I have an Asus Xonar St in an Asus pc. It is only used as a s/pdif bridge to feed a Peachtree Dacit. The system works very well, but I would like to improve the input to the dac via the xonar. I bet you can exceed the performance of any converter using the xonar st.

I have read some of the posts here, and most of them are concerned with improving the st card performance as a whole. I'd just like to get the xonar to output an unmatched quality signal to my dac to improve it's performance. I read about picking off an I2P signal from the st, better voltage regulation, etc..

Any comments or help, or reference to a thread where this has already been done would be appreciated.

  Reply With Quote
Old 12th September 2012, 12:43 PM   #2
marce is offline marce  United Kingdom
diyAudio Member
Join Date: Jun 2007
Location: Blackburn, Lancs
Asus Xonar St as bridge only...
Firstly I would check with a scope and probably a logic anyliser wether the signals are getting corrupted on the way to the DAC, if the data is getting through OK I would't worry.
  Reply With Quote
Old 12th September 2012, 02:48 PM   #3
5th element is offline 5th element  United Kingdom
diyAudio Member
5th element's Avatar
Join Date: Oct 2002
Location: England
If you're using S/DIF then a lot of it is down to the DAC itself. Modern DACs often have jitter rejection circuits build into them so that even if the sender of said data is pretty poor it wont matter so much. If your DAC is excellent in this regard then it's not worth going to the extra trouble.

I mean, I've tapped into the I2S lines of the ST and transmit them over LVDS straight into my DSP, but all of that is home built. I wouldn't really want to go doing that to a consumer DAC as that presumably would have decent resale value and once modded, it'd have far less.

Looking at the DACit though, it isn't madly expensive so perhaps you would be less concerned. Either way Tapping the I2S off of the ST would probably be worthwhile but it isn't easy to do, you'll have the potential to break the card (I almost did and I'm experienced with soldering SMD parts etc, the PCB is fragile). Looking at the Stereophiles measurements of the DACit though, it's clear that the Xonars own internal analogue section is quite superior to that of the DACit's anyway, I'd just use the analogue out of the Xonar for now. If you want to upgrade you're going to need something expensive to beat it. If you want to DIY I'd recommend some of the Twisted Pear stuff.
What the hell are you screamin' for? Every five minutes there's a bomb or somethin'! I'm leavin! bzzzz! Now with website! www.5een.co.uk under construction.
  Reply With Quote
Old 13th September 2012, 04:07 AM   #4
n0vtz is offline n0vtz  United States
diyAudio Member
n0vtz's Avatar
Join Date: Aug 2012
Location: Iowa
Thanks for the responses.

The consensus here seems to be it's not worth messing with. I was concerned with several factors concerning trying to clean up 5 & 3.3 volts ps (I need only be concerned with the digital side of the card, and the creation of the PCM signal for transfer out of the s/pdif), where would I inject a cleaned up signal, and would doing this throw off settings on the card that take a dirty signal into account? If I used a new ps, then of course there is a question as to grounding. I don't really know how clean the filtering on the ST board gets the signal without intervention. The idea was a very clean signal <40 mv ripple has got to end with a better PCM signal to the Dac. In any event it appears that it is not worth the trouble.

As far as I2S (excuse the earlier misspelling), again the potential risks and difficulties seem to exceed any potential benefit. I had no idea it was so difficult to pick up the I2S from the ST, and that leaves the problem of where to introduce it into the Dacit, without a schematic.

Peachtree is coming out with an asynchronous usb to s/pdif converter for their dacs in 2-3 weeks. It is just functional, with no frills and will be $199 with a 30 day return policy.
I'll probably give it a try. Although it may be that the Asus Xonar ST gives such a quality PCM output that the Peachtree Converter is of no advantage.

As far as the performance of the stand alone ST as compared to it's use as a feed to the Dacit, the ST fails in a very big way to perform as well as the Dacit. Possibly with the mods discussed here it's performance would more closely approach the Peachtree Dacit. See review Peachtree Dacit;

Computer Audiophile - Peachtree Audio DAC•iT Review (AKA DACiT)

It is my experience that all of the reviewers comments are correct.

Possibly within the range of money spent, this system cannot be improved upon in a significant way. I will report back per this thread on the Peachtree Converter, and it's performance.

Thanks again,

  Reply With Quote


Asus Xonar St as bridge only...Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Issues Of Asus Xonar Essence Stx fotios Digital Line Level 3 13th March 2016 11:42 PM
Asus Xonar Essence ST overheating? barner PC Based 3 31st July 2012 12:27 PM
Crossover using Asus Xonar Essence ST Deluxe 7.1 ? lduarte1973 PC Based 4 23rd September 2011 03:57 PM
New Asus Xonar Essence STX Drivers Brian Kingsbury PC Based 6 9th March 2011 09:52 AM
Asus Xonar mod ionutzxpo PC Based 0 20th April 2010 06:56 PM

New To Site? Need Help?

All times are GMT. The time now is 10:17 AM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio