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so..just looping one channel directly on the sound card will not really be accurate because then we
don't incl. mixer in the chain?....or am i missing something?...
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Depends on how significant you feel the mixer response affects the total picture. If you think it matters, then you're out of luck using the left channel for soundcard calibration for response measurements. But that doesn't stop you from using the left channel loopback when you want to test speaker distance using the System delay feature. Just loop the soundcard left channel and do the test.
With respect to XENYX 802 mixer when taking measurements using the cal file or left channel methods, I don't feel it's that significant.
If I take my two soundcard cal files (one with the mixer in the loop and one without) and compare them using the same scaling that I would in a response measurement they aren't too different.
I simply changed the cal files to text files and then graphed them with a zero normalized scale that represents a 45dB-105dB spread. The mixer is down about a dB at 10hz and about 2dB at 5Hz.
Myself, I've switched to the left channel calibrate method.
compare mixer with no mixer.jpg
brucek