On 05/28/2010 05:34 PM, firstname.lastname@example.org wrote:
a 2nd measurement showing a measurement at - let's say 1215Hz would have
made that clear in the first place. Anyway I take your word for it.
Thanks for /organizing/ this little quiz; it's quite fun!
>> Are the sample-rate settings of both cards identical?
good; those charge-pumps that are used to create 48V from 5 or 12V
often cause ripples in the supply voltage.. which in turn can influence
the oscillator.. resulting in signal modulation.
> Card X
OT: I would not trust any consumer-grade audio-interface for signal
differences larger than 80dB anyway. I'm amazed that card A shows such a
low noise-floor in the loop-back test.