Last night, I decided I was unhappy with the bass in my system. It seemed I had a lot of low bass(under 40Hz)but much less upper bass. Using test tones from the MoFi Sound Check CD and my SPL meter confirmed my suspicions. Plenty of bass at 40Hz and below, and slight dropoff at 50Hz, and 6-8db down at 80 and 100Hz. My tone controls for the receiver seem to be centered around 80Hz, so I was able to smooth things out by raising my bass tone control to +8, and lowereing the sub level 2 db. Fronts are set to small, so the control won't affect much below 80 Hz. But I know that this is only affecting my two fronts- the tone controls only affect the front L/R. Others on the forum have used equalizers to smooth out their response- do those equalizers work up to the 80-100Hz levels, and if so, is it advisable to have the sub compensating for the dropoff at those levels? I have a square, acoustical nightmare for a room. Please advise. If more info is needed, let me know.