Agree that an active EQ trim at the problematic frequency can be an effective fix, if you've covered the other fundamentals (speaker placement, securing vibrating room elements, etc..
Rooms all have their own resonance, and few approach near neutrality, while many are simply problematic even when you do all the dirty work, spend a bunch on tube traps, etc..
Sometimes just a little trim at a problem frequency is so much more of an easy fix than infinately fussing and frustrating yourself...or, lighten your bass tone control slightly, if you have one. Yes, it's not purist to use tone controls, but you are looking for the overall best effect, and if improves things more than worsens them (hopefully much more), don't be too religiously against it.
Digital EQ should have the least negative effect, especially on phasing, but also a high quality analog EQ is not something to rule out. Used sparingly, mostly for cutting peaks (dips are often hard to add gain to, as they often are due to out of phase signals). Try to use it very sparingly, and only on the bands where it truly sounds good to use. Try keeping your adjustments to about 3db or less for least negative effects. I picked up a beautiful and really quite transparent Rane EQ at the Flea Market for $60. Rane makes alot of pro gear, and their analog EQs are quite nice.
Alternatively, try some different interconnects and maybe speaker cables. Some are lighter on bass than others, and the right one might just rid you of the bass bloat you are getting. If all else fails, remember that 99% there isn't so bad, and think of all the people putting up with all the pops, ticks, and warbles they get with their vinyl, and they still find the ability to love the heck out of it.
Jeff
