My computer amp is a Harmon\/Kardon AVR 1700 (use as 2 channel), Axiom 2-way bookshelf speakers and a Klipsch KSW-10 floor-firing 10" sub. Is there a device that will boost the sub out from the Harmon\/Kardon? I am not getting enough for my liking out of the Klipsch. The Klipsch will stay on even with the music at low volume, but I had an 8" Yamaha that would go ahead and go inactive with low volume. That was frustrating. The Klispch is obviously set to "auto" with volume up to max. Funny, the Yamaha had enough volume at normal listening levels, but when it went inactive, that was frustrating. Otherwise, I would just keep using the Yamaha.