Asus Essence STX Extension Oustide The Case? - Page 5 - diyAudio
Go Back   Home > Forums > Source & Line > PC Based

PC Based Computer music servers, crossovers, and equalization

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
Reply
 
Thread Tools Search this Thread
Old 6th March 2012, 05:14 PM   #41
diyAudio Member
 
5th element's Avatar
 
Join Date: Oct 2002
Location: England
Quote:
Originally Posted by wushuliu View Post
Listening. It's very evident. Nothing subtle about it.
If it isn't subtle then you should be able to easily measure it!

As it happens the Xonar uses an internal PLL within the Cmedia chip to generate its on board clocks.

From my own measurements I have a feeling that the Xonar might only bring in the PLL for frequencies at multiples other then the frequency of the main crystal. So for 192/96/48 etc it uses clock division of the main crystal. I am only basing this on my own jitter measurements in loopback though, so this could be full of holes.

44.1 on the left 48k on the right. Interestingly this problem goes away when comparing 88.2 and 96kHz, but it's reason enough to upsample using software imo. This was done using ASIO drivers.

Click the image to open in full size.

Using a better external clock might improve the 48kHz performance, but I don't know if it would do much if there's a PLL after the clock.
Attached Images
File Type: gif 44vs48.gif (45.5 KB, 111 views)
__________________
What the hell are you screamin' for? Every five minutes there's a bomb or somethin'! I'm leavin! bzzzz!
  Reply With Quote
Old 6th March 2012, 05:43 PM   #42
diyAudio Member
 
wushuliu's Avatar
 
Join Date: May 2008
Location: Los Angeles
I made several changes to the card and replacing the clock was the most significant. The new clock cost all of $35. Maybe there are measurements out there as a lot of people have done this mod. Enjoy.
  Reply With Quote
Old 6th March 2012, 05:55 PM   #43
marce is offline marce  United Kingdom
diyAudio Member
 
Join Date: Jun 2007
Location: Blackburn, Lancs
For a digital clock, the most critical part of a digital circuit...
How can you tell by listening how the clock is performing, clock signal integrity is affected by a whole host of things, PSU, decoupling and most of all the length of the track and any impedance mismatches, removing an on board clock and running a wire to a pad is one of the worse mods I can imagine.
But you cant examine the clocks waveform by listening, not examine any other possible integrity issues created by messing about with clocks. You need scope shots and preferably a network analyser. Clocks being the most critical part of a digital circuit are laid out to minimise the trace length, and more often than not a series resitor is used to match the output to the trace impedance to minimise ringing and overshoot, you need the right tools to do this, it is in the digital domain.
Posr #41 shows how to do it...

Last edited by marce; 6th March 2012 at 05:57 PM.
  Reply With Quote

Reply


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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Gigawork DAC vs Asus xonar essence stx robump PC Based 13 8th April 2011 07:01 AM
New Asus Xonar Essence STX Drivers Brian Kingsbury PC Based 6 9th March 2011 09:52 AM
I2s from asus essence stx? bambadoo Digital Line Level 1 19th February 2011 01:05 AM
Issues Of Asus Xonar Essence Stx fotios Digital Line Level 0 12th May 2009 09:42 PM
Asus Xonar Essence STX analog input? fotios Digital Line Level 1 25th April 2009 10:55 PM


New To Site? Need Help?

All times are GMT. The time now is 11:46 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2