I just got the Avia disk and rat shack analog SPL meter. I went through the first setting of test tones and balanced my 5 main speakers. Then I went on to subwoofer calibration. With the speakers set to small, the subwoofer obviously puts out dramatically more SPL. My issue is that when they are set to small, I CANNOT calibrate the sub to the other speakers - even turning the sub level down to -10 won't balance it properly. Am I supposed to calibrate with all the speakers set to large so that I am calibrating only the LFE channel against the remaining speakers? Then can I just set it back to small when the calibration is over?