edit: updated plot. old plot can be found here I made this plot using the RS SPL Meter with corrections and 16bit 44kHz mono wav files burned on a cdr played on mains and sub from my Atlantic Technology 170 system. I know I can BFD the bass, but everything above 90hz is played by the mains and I can't do anything about that. That -9dB null at 200hz is absolutely horrendous and completely ruins what would otherwise be +/- 3.5 dB in the mains. Where did I go wrong? edit: new pics of my ht setup: pic3 pic4 pic5 old pics: pic1 pic2 it's a bit more funished now than when I took the pics, but the major things are still the same.