This $95 powered Polk is compact enough, variable cross-over to tune to work with your behringers, etc. Just go get the thing. Sorry to disagree with Mac a bit, but this thing would be a better match for your use with monitor speakers that already should have plenty of grunt. You can dial in the cross-over frequency with this thing, not the Bazooka, as far as I can tell. You are not going to want to dial that crossover much over 100 Hz, would be my guess, maybe even lower. You'll have to use your ears. Plus, it's $95 and it's Polk audio.

http://atlanta.craigslist.org/wat/ele/3135733426.html

-Scott