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Nuforce uDac 2 RMAA measurements. - Page 2

post #16 of 19
Quote:
Originally Posted by busyx2 View Post


The rolloff is probably the cut-off filter of the RMAA at 20kHz, it is a very sharp slope.  See the uDAC measurement as part of the 25 USB DAC plots.

 

http://www.nuforce.com/hp/docs/review/DAC-Headphone-Amp-Tests-PlotOnly.pdf


 

 

I've seen plenty of 16/44 RMAA measurements and all of them extend to 20khz without such a roll-off unless there is something flawed with the output or input device (e.g. on an older computer with a onboard sound chip). If there is a filter it's beyond that point.  What is going on with this measurement?
 

post #17 of 19
Thread Starter 

I don't know why there is such a roll off, I set the input device at 24/96 which should be able to capture correctly a 20 kHz signal, if someone has an idea of what I did wrong (assuming it is manipulation error and not simply a characteristic of the tested DACs), I'd be happy to do the measures again.

post #18 of 19

I'll be testing my uDAC 2 shortly with both RMAA and my Prism Sound dScope professional analysis system. Hopefully I can solve the mystery of the 16 Khz roll off. The full review will be on my blog.

post #19 of 19
Quote:
Originally Posted by khaos974 View Post

I don't know why there is such a roll off, I set the input device at 24/96 which should be able to capture correctly a 20 kHz signal, if someone has an idea of what I did wrong (assuming it is manipulation error and not simply a characteristic of the tested DACs), I'd be happy to do the measures again.


 

Could it be possible this is because the output is 16/44 and the input is 24/96?  I realize in theory this should not be a problem, but maybe there is some software related issue?

 



Quote:
Originally Posted by nwavguy View Post

I'll be testing my uDAC 2 shortly with both RMAA and my Prism Sound dScope professional analysis system. Hopefully I can solve the mystery of the 16 Khz roll off. The full review will be on my blog.


Looking forward to your results.

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