Real or fake? - Page 2 - diyAudio
Go Back   Home > Forums > Source & Line > Digital Line Level

Digital Line Level DACs, Digital Crossovers, Equalizers, etc.

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 18th February 2012, 11:19 PM   #11
diyAudio Member
 
Bernhard's Avatar
 
Join Date: Apr 2002
Location: Munich
Click the image to open in full size.

All removed from old cd players.
Chips from recent production could look different.
I have another 32 pieces in my DAC, some made in PhilipPines.

Last edited by Bernhard; 18th February 2012 at 11:23 PM.
  Reply With Quote
Old 18th February 2012, 11:59 PM   #12
diyAudio Member
 
Join Date: Jan 2008
Location: Virginia
Looks like my sound card input cannot go below 0.096% THD on input. And loopback from line-out is even worse that playing a CD! Normal, the card has the crappy original OpAmps and a CL DAC.
I need a better ADC
And RMAA free does not analize wav with higher PCM than 44.1kHz and 16 bit. What other software can I use?

@Bernhard - do you have any PCM61P-K?

Last edited by SoNic_real_one; 19th February 2012 at 12:23 AM.
  Reply With Quote
Old 19th February 2012, 06:05 AM   #13
diyAudio Member
 
Join Date: Jul 2011
Location: Canary islands
May VISUAL ANALISER 2011XE be usefull to You.......

cheers.
  Reply With Quote
Old 19th February 2012, 01:02 PM   #14
diyAudio Member
 
Join Date: Jan 2008
Location: Virginia
That's cool, thank you. However it lacks a feature that RMAA has. It needs to be able to save as wav a "test" signal, that I can burn and play on my CD player. Then record via ADC to be analyzed in the software. RMAA does that, but the free version accepts (loads) only 44.1kHz/16bit input from ADC, and that limits the capability. My ADC has a slow roll-off filter at that sample rate -6dB at 20kHz, so I really can analyze only to 15kHz.
Plus, from my preliminary results, looks like I need a better soundcard (better THD on ADC part).
Attached Images
File Type: png RMAA.PNG (50.0 KB, 142 views)

Last edited by SoNic_real_one; 19th February 2012 at 01:26 PM.
  Reply With Quote
Old 20th February 2012, 03:48 AM   #15
diyAudio Member
 
5th element's Avatar
 
Join Date: Oct 2002
Location: England
Just use ARTA's spectrum analyser it will work with an external source, just set the input going and turn off the generator.

What ADC does the card use? That distortion seems unusually high, especially for what creative are marketing as a somewhat more upmarket card, usually they use decent converters.
__________________
What the hell are you screamin' for? Every five minutes there's a bomb or somethin'! I'm leavin! bzzzz!
  Reply With Quote
Old 20th February 2012, 10:32 AM   #16
diyAudio Member
 
Join Date: Jan 2008
Location: Virginia
The "consumer" sound cards have usually given only the output specs (DAC). For X-Fi Platinum:
• Stereo Output 109dB
• Front and Rear Channels 109dB
• Center, Subwoofer and Side Channels 109dB
• Total Harmonic Distortion + Noise at 1kHz (20kHz Low-pass filter) = 0.004%

The ADC seems to settle THD=0.1% (at 44.1 kHz/16 bit) since two different players show the same value. I did try loopback on card and is even worse!? I will play latter with the other software, maybe is an operator error.
  Reply With Quote
Old 20th February 2012, 02:26 PM   #17
diyAudio Member
 
5th element's Avatar
 
Join Date: Oct 2002
Location: England
Well I know that creative cards are notorious for using lots of processing so it could be shoddy DSP work that's destroying the linearity 0.1% seems too high and even higher in loopback mode? Something doesn't seem quite right.
__________________
What the hell are you screamin' for? Every five minutes there's a bomb or somethin'! I'm leavin! bzzzz!
  Reply With Quote
Old 20th February 2012, 02:53 PM   #18
diyAudio Member
 
Join Date: Jan 2008
Location: Virginia
I did try to set the X-Fi DSP master clock to 88.1 and 96kHz and it didn't do any change in results - looks like the DSP induced THD is really lower than that (they claim -140dB).
I did try to set the recording rate to 96kHz, but then the RMAA complained that the resulting files are not "PCM standard" and cannot use them...
I will try today using the ASIO options in the Creative software and maybe other recorder than the stock Creative one.
  Reply With Quote
Old 20th February 2012, 08:35 PM   #19
diyAudio Member
 
Bernhard's Avatar
 
Join Date: Apr 2002
Location: Munich
Quote:
Originally Posted by SoNic_real_one View Post
The ADC seems to settle THD=0.1% (at 44.1 kHz/16 bit) since two different players show the same value. I did try loopback on card and is even worse!? I will play latter with the other software, maybe is an operator error.
Maybe input level not high enough ?
  Reply With Quote
Old 20th February 2012, 10:17 PM   #20
diyAudio Member
 
5th element's Avatar
 
Join Date: Oct 2002
Location: England
Then switch and use ARTA instead, it is infinitely more flexible then RMAA. RMAA is a pain.
__________________
What the hell are you screamin' for? Every five minutes there's a bomb or somethin'! I'm leavin! bzzzz!
  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
fake or real ? mgm2000ro Class D 6 14th December 2008 07:03 PM
Fake or Real? Elso Kwak Parts 20 28th May 2005 08:32 PM


New To Site? Need Help?

All times are GMT. The time now is 09:42 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