I recently spoke to the owner of Janis Audio, who specializes in subwoofers for audio (not theater). I have a 1/A sub amp and crossover. The main goal of Janis is to integrate a sub to the point that you can't tell it is there. The Janis equipment is of such high quality that it is not only transparent but, you can match up any reasonable equipment. Call there and see for yourself.
Emery
Janis-718-892-7419
Emery
Janis-718-892-7419