Hey guys. Im trying to calibrate my HC6 sub. Ive managed to calibrate my other speakers to 75db but when I keep that same setting and switch to my sub the SPL meter goes off the charts. I have the subwoofer level at around 40% eyeball, the crossover turned to max and at 120 in the receiver, and the phase on 0. Am I doing something wrong or is the level too high? Thanks.