As suggested earlier in the thread I've now run Audyssey but all it's done has muddied the waters for me.
What receiver black magic have I engaged so that I am seeing a difference between the same full frequency sweeps, but with different speakers powered on (bare with me--I'm not that
REW out of PC via ASIO4ALL HDMI to channels 1 and 2 to Onkyo 805 AVR
Full frequency sweeps (20 to 20000) with AVR in "stereo" mode, -30dB FS
AVR Audyssey chosen crossover of 90Hz
Play full sweep with just Sub - good SPL
Play full sweep just L - good SPL
Play full sweep just R - good SPL
Play full sweep with L + Sub, Sub stays the same, L drops by 10dB
Play full sweep with R + Sub, Sub stays the same, R drops by 10dB
Something I need to change on the AVR side? Is my brand new UMIK-1 with calibration file actually not that calibrated? Any idea what I'm missing?