Have you thought about buying an integrated amp with preamp outputs or separates. That's what I would do.
Bought the wrong subwoofer!
I was planning to buy a Rel subwoofer but stumbled across a good deal for a SVS sb-2000 pro so I decided to give it a try. Turns out that the the pre-outs on my integrated amp aren’t pre-outs at all but are rec outs (should have put on my glasses). The Svs doesn’t have high level inputs and my amp doesn’t have pre-outs so I’m screwed right? Guess it wasn’t such a great deal after all.