Here's my situation. I used REW and BFD to EQ a set of subs and got reasonably good results. When I add the main speakers to the mix and re-measure the response, the interaction of the mains with the subs throws the curve out of whack. My thought is that for movies this isn't a big deal because every channel is discrete, but for music where the bass crosses over at 80 Hz and there is some overlap between the subs and the mains, this might be a problem. My question is: Should I add some additional EQ to correct the bass reinforcement due to the introduction of the mains? Does it make sense to have seperate EQ setups for movies and music (2 channel matrixed)?