2 subs?

If you do subs right, much less stress is put on your amps, so the sound is cleaner and clear without having your amps work hard for the lows. Two subs are good because it evens out the sound. For more information on this, go to Vandersteen's website.

If you were getting good performance before moving and the only thing that's changed is the room, you might try playing with your speaker location and set-up (toe-in) and your seating position. The new room is "the hand you are dealt" but if all else is the same, tis the different factor.
Suggest you try getting that a right as possible, before spending bucks on additional equipment.
Good luck!

2 are better ,it loads the room better but it doesn't sound as it would help your current problem. Raising the crossover points on the subs may well make things worse. It sounds like you are getting cancellation of frequencies due to room reflections. Do you have a lot of glass in your new listening room? Are most of the walls highly reflective?You might want to try to damp them. Get a computer program that shows where to place the speakers or try moving them around the room. Experiment with angling them inward so their tweeter axis cross just ahead of your listening position. Don't buy anything before you attempt to see what is wrong with the room.