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#21 | |
diyAudio Member
Join Date: Apr 2002
Location: Vienna
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Quote:
give it a try. BR Gary
__________________
I hate "sounding amps", except these are Marshalls, driven by Eric C. or Jeff B., period. |
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#22 |
Account disabled at member's request
Join Date: Mar 2002
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Dave,
there are some symmetric waves: +/- ... 5Hz, 12Hz, 22Hz, 50Hz in the -120.. -130dB region. We have also to consider the FFT size (256K), while as used in my measurement (2^25) this will lower the bin distance and the noise level / bin, but in the other hand clear modulated (symmetric around the carrier) will be visible. Hp |
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#23 | ||
diyAudio Member
Join Date: Feb 2010
Location: Dallas Fort Worth area, Texas
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Hi Gary,
Quote:
I'm working on a really old firmware version with the UPV I have. Version 1.4. Updates to the current version 3.2 are possible but I have to step through one or two previous versions to get to the latest. I had been waiting to do so until I sent it in for an upgrade to add the digital interface incase there was an issue upgrading and it went down. Quote:
Thanks, Dave |
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#24 | |
diyAudio Member
Join Date: Feb 2010
Location: Dallas Fort Worth area, Texas
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Hi Hp, Gary,
Quote:
Dave |
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#25 |
diyAudio Member
Join Date: Nov 2004
Location: Germany
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Looks like very, very low jitter levels that nobody needs to worry about.
Your THD and IMD measurements may be limited by the analyzer, at least assuming the DAC sticks to its -94 dB THD spec and the output stage doesn't mess that up. 2nd and 3rd at -90 dB each would be entry-level soundcard level (e.g. Xonar DG) at best. It may be interesting to run the usual intersample-over tests, though I doubt the designers of a modern-day DAC digital filter would mess up there. |
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#26 | |
Account disabled at member's request
Join Date: Mar 2002
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Quote:
![]() Hp |
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#27 | |||
diyAudio Member
Join Date: Feb 2010
Location: Dallas Fort Worth area, Texas
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Hi Sgrossklass
Quote:
The 9023 does not perform to -94 dB FS (2V RMS) @ 1kHz as far as I can tell, even when pretty optimally implemented. THD improves as the frequency rises and gets a little worse lower. I can verify this by measuring in 80KHz or greater bandwidth. My guess is that THD performance is a function of power in the internal opamp, or perhaps from the charge pump. The follower buffer/LPF performs in the mid ninety dB range as implemented. Quote:
I'm happy to defend the design as a whole though for its simplicity and performance vs. cost. Looking at the music in my library on an oscilloscope I have not found tracks with sustained levels at 2V RMS, or even 1.5V. In the 0.5 to 1V range the 9023 works very well and has the noise floor, dynamic range, and jitter performance to make it shine where most music I listen to is. Quote:
Thanks, Dave |
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#28 |
diyAudio Member
Join Date: Feb 2010
Location: Dallas Fort Worth area, Texas
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Hi Hp,
Nope, same one. I have two of these buit up identically and they both perform similarly. I am reasonably sure this is the same one used for the original testing as it has not left that bench and the other is in the system to listen to... Here are the two measurements side by side again. Any peaks and troughs in the one on the left (no averaging) are random and move around with every sweep. I did not get the grid set up the same as all of the presets went away with the upgrade. Apologies there. Dave |
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#29 |
diyAudio Member
Join Date: Feb 2010
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Any further updates on how the 9023 sounds? No news is usually good news
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#30 |
diyAudio Member
Join Date: Oct 2003
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No news can also mean very busy making a living.
![]() Patrick |
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