Techie Geek Question

[keny]

I am studying how A/D's work and I have a 192 and a 96i, and was wondering about how the antialiasing filters work for those units.

a basic question:

is the lowpass filter different for every sample rate you record / playback at?

Meaning if I am at 44.1, the filter is a little lower than the nyquist, and as I go higher in sample rates, is it always a little lower than the nyquist, or is the antialiasing filter always just over the human hearing threshhold? I know there is a big difference with the different sample rates, but I guess what I am trying to figure out is, what is the fundamental differences between recording at 88.2 vs 96k, outside of the obvious mathematic difference when ultimately going to 16/44.1

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And a side question, If anyone is using an api 4032 console, are you using the +4 or the -10 inputs? I was in a studio the other day where the board was clipping before protools and am wondering if thats what the problem was.

Keny