ESFIII:
it's not a stupid question at all, and i don't really know the answer, but i think i would set the channel calib settings all to '0' and use the "channel trim" menu for calibration with the avia disc.

if you have to tweak the trim of a speaker while playing a particular disc (after calibration), you have to remember to reset afterwards, but you'd have to do that anyhow.

let me know what you think. also, before you reset the channel calibration menu to '0', write the settings of your "dial-in" down and compare to the calibrated settings in the channel trim menu when you finish.

actually, it's an interesting question to me.