if mixes you listen to are multilayered, you might try Behringer's EX2200 which has some sort of bass 'processor' plus a comb-filter/'excitor' for mids & highs (with varible high-pass filter and blend) - very nice for $69US - bass enhancement places more load on the speaker but think its a better alternative to simple eq - really like it with 3BX.

Freddy