Normally, I select Avia's left front/subwoofer level to calibrate my subs, then run the left front/LFE frequency sweep to gauge the effectiveness of positions/settings. Last night (while experimenting with new subwoofer locations), I noticed that the sub level in the left front/subwoofer test tone (as calibrated with an SPL meter to match the alternating left front pink noise level) is lower than in the other two channels. In other words, switching to the center/subwoofer or right front/subwoofer test tones gives (i) the same db level of the speaker pink noise but (ii) a much higher subwoofer reading than with the left front. All speakers are small with an 80hz crossover. Which channel should I be calibrating the sub to?