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Reference DAC Module - Discrete R-2R Sign Magnitude 24 bit 384 Khz
Reference DAC Module - Discrete R-2R Sign Magnitude 24 bit 384 Khz
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Old Yesterday, 12:09 AM   #6961
hop.sing is online now hop.sing  Europe
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Join Date: Feb 2009
Location: Munich
Quote:
Originally Posted by DEQ+TheEnd View Post
I stand corrected. Went back and reread Søren’s post #6825. What he actually said was that the board do sync, but need a few uS before it locks to clock. Sorry for the FUD.
I use a dam1021 with AES/EBU in a studio environment.
Using it in phase critical applications, like eg parallel processing, might be problematic since the macro timing seems to fluctuate slightly. I heard it while recording two loops of the same sound file with the dam1021 (into the pcm4222 evaluation board adc).
When reversing polarity on one recording and listen to the leftover of the two files running in parallel I heard a that the two files change phase relationship while running. As if the dam1021 corrects its fifo slightly, but not always the same way. With traditional (FIFOless) DAC converters the PCM4222 ADC does not do that, so I blame the DAM1021.
The jittertest shows a very clean signal, much better than my RME UFX sound card. So micro timing seems to be flawless.
Maybe my aes/ebu arrangement is faulty, but I rather think, that the Dam1021 locks to the clock but corrects the fifo every once in a while so the sound file shifts a little in time.
Please correct me if my assumption is wrong.
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Old Yesterday, 01:37 AM   #6962
soekris is offline soekris  Denmark
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Reference DAC Module - Discrete R-2R Sign Magnitude 24 bit 384 Khz
Quote:
Originally Posted by hop.sing View Post
I use a dam1021 with AES/EBU in a studio environment.
Using it in phase critical applications, like eg parallel processing, might be problematic since the macro timing seems to fluctuate slightly. I heard it while recording two loops of the same sound file with the dam1021 (into the pcm4222 evaluation board adc).
When reversing polarity on one recording and listen to the leftover of the two files running in parallel I heard a that the two files change phase relationship while running. As if the dam1021 corrects its fifo slightly, but not always the same way. With traditional (FIFOless) DAC converters the PCM4222 ADC does not do that, so I blame the DAM1021.
The jittertest shows a very clean signal, much better than my RME UFX sound card. So micro timing seems to be flawless.
Maybe my aes/ebu arrangement is faulty, but I rather think, that the Dam1021 locks to the clock but corrects the fifo every once in a while so the sound file shifts a little in time.
Please correct me if my assumption is wrong.
The boards will follow clocks to within a few uS, but two dam1021 will never be synchronous. If that's a requirement, just use synced dam1121.
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Old Yesterday, 12:28 PM   #6963
DEQ+TheEnd is offline DEQ+TheEnd  Norway
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Thanks for clarifying this.

...now what to do with two rev1 boards originally bought for a crossover? Maybe build a costly boom-box with Linkwitz-transform IIR filter?

btw hop.sing I also have the RME UFX, a great and sturdy tool IMHO.
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Old Yesterday, 03:50 PM   #6964
hop.sing is online now hop.sing  Europe
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Quote:
Originally Posted by DEQ+TheEnd View Post
Thanks for clarifying this.

btw hop.sing I also have the RME UFX, a great and sturdy tool IMHO.
Yes it is! Best software on the market, and it never let me down. Sound quality is good enough for a lot of things, but the the dam1021 is the better Dac and the pcm4222 is the better adc.
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