I bought a measurement mic and the TrueRTA software to calibrate my sub with. I have a peak at 63Hz that wasn't there a few months ago. Drove my self nuts trying to fix it with the sub EQ and positioning. Turns out that the M60s were causing it. Fixed it by moving them 5", but all I did was move the peak to 80Hz. The hump at 63 sounds better, so I moved them back. My room stinks. I need some bass traps, I think.

What's the formula?

Freq = distance / speed of sound ?

M- M60s/VP150/QS8s/SVS PC-Ultra/HK630 Sit down. Shut up. Listen.