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I like to set the pre-amp sub level between 1/4 and 1/2 of the total range (i.e, between -5 and 0 if the control range is -10 to +10) in order to to minimize pre-out distortion.
A few studies a while back on sub pre-out levels showed distortion up creeping up into the 1-2% range when the control level was cranked up into the positive range.
As for the actual sub calibration level, for HT and the speaks set to small, +3 to +4 (i.e., 88-89 dB for S&V and Avia) works pretty well for me. For music, I prefer a "flat" calibration.
You have to remember, the S&V and Avia are true DD soundtracks, so the sub test tone is NOT discrete, and the corresponding surround speaker will still contribute quite a bit of the total sub tone volume, even when set to small, particularly if you are using an 80 Hz or lower high pass.
If you don't believe me, run the sub test tone for a given surround channel and power off the sub - you will be getting anywhere from 78-82 dB contribution from the surround speaker if you have an 85 dB overall calibration level with the sub running. This phenomenon can lead to "undercalibrating" the sub, as compared to the AVR internal test tones, which are discrete in comparison.
So don't be afraid to go a bit hotter than you might suspect is prudent if you are doing sub calibration with Avia / S&V.
Regards,
Ed
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