Try an AAD C-10, I think it is, way below $1,000 and I just installed one with a friends Aerius i speakers and it worked very fine indeed. Do not run the Aerius out of the sub, use its internal crossover, just add the subwoofer in parallel with your speakers (a la the REL method), set the crossover point on the sub to its lowest point and play with the volume level on the sub, move it around, and move your Aerius a bit further out from the wall than you had it before. You could afford 2 new ones for around $1,000.
