Hi John

For me it was narrowed down to 2 choices, the Roland KCW1 or the Logitech z5500 sub.

I almost bought Uncle Dave's Roland KCW1 sub, but at 50 pounds, I knew it wasn't going to be for me. Donny Pesce bought it instead.

While I know in the realm of subs, even 50 lbs is pretty light, but I am very careful of what and how I lift at the present.

I use the sub only from the Logitech z5500 with powered JBL Eon G210's.

All I do to hook up the sub is to plug it into the headphone jack on my Tyros. The JBL's either go straight from the Tyros or sometimes I use an UB802 Behringer stereo mixer for some more headroom.

The z5500 sub weighs only 34 pounds and measures about 13 inches square. It is 188 watts RMS. It has a 10" speaker and this sub kicks out sound like you wouldn't believe. I don't use the satellite speakers at all. If a person would really want to rattle the roof, just hold down on the volume control on the remote control and it goes into boost mode. Believe me, I'd never need to go full blast with this sub.
http://www.zzounds.com/item--ROLKCW1
http://www.logitech.com/index.cfm/products/details/US/EN,CRID=2,CONTENTID=9486

Best
Scott

The z5500 system runs about $350.