don't boost, start flat, move the high and low bands down. IF you are in 4 channel thing about going to 2 channel ew mode, you have a lot mroe control it seems to me. WHat kind of setup do you have, amps and that, and what sort of crossovers are you using? Also, how are you encoding your mp3's? runa test with a few mp3's at 320 cbr just to make sure your encodings are screwing up the frequencies.