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-endare 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?