I have tried EQing extensively in the past with different speakers, and to me: electronic EQing usually ends up sounding artificial over the long run. Maybe I just wasn;t doing it right, but it never sounds "natural" to me. Perhaps it's the decay of instruments.
The one EQ that does sound OK to me is when I turn up the "loudness" button on an old Yamaha natural sound solid state amp, and turn the bass up by 2 nothces. THat does crank up the bass.Another thing to note: no matter what EQ you do, it will casue a drop in efficiency. If you want ultra high eff, then crossing them off in a sealed box or open baffle at 150-200 hz is probably ab etter solution. Of course then you no longer get teh "full range" effect.
-akhilesh