Hi,

I tried the RMAA audio analyzer program on my soundcard (ST Audio
DSP24 Value) using line-in to line-out through the Behringer UB1002
mixer (connecting to tape-in and tape-out). The result was quite
good, with very low noise level. But looking at the Stereo Crosstalk
plot, I saw something quite strange. Crosstalk was fairly low all the
way from 30Hz-1KHz (below -90dB), but then it rised linearly (in
logarithmic scale) from -94dB at 1KHz to -72dB at 20KHz. It didn't
happen when I did a direct loop-back test, which kept stereo crosstalk
below -90dB all through the spectrum, so it must be the mixer that
added this peculiarity.

Is this normal in any mixing board? Would that level of crosstalk be
audible and affect the sound coming through the speakers? I guess it
would lessen the soundstage/stereo image, or worse, make the sound
field positioning imprecise (or unreliable, e.g., instruments moving
left and right when played at different octaves) due to different
levels of crosstalk at different frequencies.

The last question is: Should I concern myself with the issue? Maybe
it's not much of the problem, or you may have a suggestion as to how I
could correct it.

Thank you very much in advance.
Poonna