Joe A screen shot indicating the AP192 sound card noise level with nothing connected to the inputs is attached. Reference level is full scale (4Vrms). Aside from the few discrete spurs which differ between both channels the region from 1 - 10kHz is fairly quiet. Technical Notes:
FFT bin equivalent noise bandwidth ~ 3Hz. 96 KSPS. Bruce
<<inline: AP192_No-input.gif>>
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