Gang, I just got my first sub, an SVS 20-39 CS+ (OMG is all I can say ) but I am having trouble calibrating it. I did a search, but couldn't find an answer. I am using Avia, and have all 5 surround speakers set to 85 dB. I am using the alternating pink noise for the mains/sub to calibrate, as suggested by others. I believe I am using the left main, but I don't guess that matters much. At any rate, the needle on the SPL meter bounces back and forth like a pogo stick. And yes, the meter is on slow response with C weighting. I tried putting at an "average" of where the needle is bouncing, but is there any simple way to make the reading a bit more stable even with the meter's decreased sensitivity to low frequencies? Any help here would be appreciated, thanks.