I'd been having a lot of trouble getting my mixes to translate well to other systems (a lot of trial and error - mostly error) and I finally did a sine wave plot of my monitor/room. No wonder...as much as 20db differences at some frequencies (I did three runs and averaged the results).

I moved the monitors around (Tannoy System 8 II), put sand in the monitors stands (BIG difference), got some Auralex, etc., so now the mids and high end are much better (smoother) from about 300hz on up..

However, it seems I have a couple of room modes that are causing some serious low-end problems. Specifically, I get a HUGE dip at around 100hz (12db) and a peak right after that at around 130hz (up about 6db). This makes the low-end sound, uh, rather...funky, at best. Otherwise, I get good response clear down to 40hz.

The 100hz range seems to be a "triple mode" where all three room axes have a corresponding wavelength that matches that frequency - according to a couple of room mode calculaters I tried. I GUESS that there is some serious bass frequency cancellation going on because they're hitting each other out of phase.

So the question seems to be: would adding some bass traps actually help bring up 100hz by absorbing some of the low-frequencies so there is LESS phase cancellation? It seems a bit counter-intuitive to trap MORE bass in order to increase it, but if it really IS phase cancellation, it should work. What do y'all think?