Mike, corner trapping with traditional bass traps should help, but it is not always able to fix it. EQ like behringer or tact, or tuned freq traps like RPG or homemade may be more effective than broadband if it persists after adding a few thick FG bass traps. But broadband absorption is ideal because it reduces ringing of all bass freqs, increasing bass clarity. You can find an interference peak for any freq in the room, so best to reduce ringing of all bass freqs with broadband, but this can be a tall order because low freqs don't give up easily and broadband absorption is not as efficient at single freqs, except maybe GIKs mondo at 80Hz (wow!) A tuned trap can be better at plucking out a problem freq created by parallel walls.
6" thick FG panels in the corners close to the speaker (like floor/wall right next to the speakers) might be worth a try, but there's never any guarantees, you just gotta try to know for sure. Best to borrow some if you can. You might need 8 or more to hear a difference in a stubborn specific freq. Sometimes that's not enough either. Hopefully yours will be easy to fix. There's always EQ as a compromise solution, and that has great WAF!
Bass freqs from a box speaker propagate as spherical waves in all directions, so pointing them makes no difference. Placement also does not change the rooms freq response on the whole, but it will move the peaks and nulls around, maybe out of your listening spot.
But those freqs corresponding to your room dimensions will still be resonating, even if level response is flat at your spot. Ringing smears bass response so it has to be damped, just like mids to be able to hear the clarity of a good system. realtraps.com has this explained much better.
Acoustics are like the "sound barrier", you never knew the problem existed until your high clarity system revealed it. After you know about it and hear the bad effects from it, you realize it is difficult but essential to get through it! The timepieces are very efficient at low freqs so they stir the room easily. You're not the only one trying to come to terms with that mighty TP bass. Hope this helps!!
Rich
edit: Like the TPs, the Nuforce are awesome in the bass freqs, so no problems there. New amps won't help unles they have lousy bass response, but that would be no fun!
