I'm looking to add a subwoofer to my AV40s. The lows are pretty sloppy at loud volumes and distort the rest of the speaker. Will adding a subwoofer remove the lows from the AV40s and clean them up? If so, point me in the right direction with some links to a subwoofer. I know the Dayton ones that had the RCA pass through were good but they're no longer around.

I'm using a Kontrol S2 and the AV40s. Thanks guys.