I think a 120 Hz dip corresponds to about 2.3 feet from speaker (driver, port, whatever) to wall or floor. If you have a bunch of "2 foot 4 inch" distances in your system you might want to try to change some or all of them.

Last edited by bridgman; 05/30/07 10:00 PM.
M60ti, VP180, QS8, M2ti, EP500, PC-Plus 20-39
M5HP, M40ti, Sierra-1
LFR1100 active, ADA1500-4 and -8