I'm currently using two SVS 25-31PC+ subs along with the 950/ICBM for HT and music (no SACD or DVD-A just yet). The ICBM is installed between the 950 and the amplifier.

Note that the subs have variable phase controls (0 - 180), and they're setup to work in stereo, not mono, using the ICBM. Also, each sub is located near its corresponding L/R main speaker. Main speaks are away from side and rear walls.

Does anyone have advice on the best method (using the old Avia disc and a Radio Shack SPL meter) for calibrating the phase and output levels for the subs relative to their corresponding mains?

Thanks in advance.