I have been looking for a dedicated Subwoofer Preamp. Something like a Plate amplifier you find on the back of powered subs but only the preamp section. This way I can use whatever amp I have and any sub. I have several amps and several sub drivers. I like to experiment with enclosures and different drivers. If I had a small Subwoofer preamp then I could rotate amps and subs with the capability and flexibility of adjustment from my listening position (with a nice long rca cable of course). Is there such a thing? Something with level, phase, crossover, eq, controls and all the other fancy stuff?????