Unfortunately the sub doesn't have a dedicated "on" position so I'm kind of out of luck.
I'm definitely in the market for a new one and want to upgrade to something better. However, to tell the truth, I've been happy with the JBL. It's lasted several years and I didn't pay much for it - I think it was half-price on clearance at Best Buy. That was the selling point. Otherwise, I would have bought something else.
I've purposely avoided listening to better systems knowing I'd want to go out and upgrade immediately. In my little world, my system sounds great - at least when I have nothing to compare against. Still, my thought process has always been that when something goes out and needs to be replaced, it's an excuse to upgrade.
Anyway, I guess I have some reading to do to figure out what I want. HSU and SVS seem to be popular. Anything else I should check out? Probably in the $600 range. I doubt I could sneak anything higher past my wife...