I had a couple of dead 2240s that I purchased cheap from a sound reinforcement company reconed into 2245s several months back by my JBL authorized dealer and I finnally got around to getting some suitable cabs and installing them last week for a 5 channel basement HF system.
They are running off a 5 channel Adcom pre-amp sub bass channel being driven by a 500 WPC Crown.
Well, without a ton of time listening, my first impression is that they are a nice addition to my system.
My only complaint is that they seem very inefficent needing tons of power to keep up with the rest of the system (3-ways w/2226s, 2426s, 2504s, etc) . I've tried using only one 2245 driver first and then both drivers in a parallel circuit. The single driver seems to work best.
Anyway, the gain on the non-sub channels needs to be turned down so the 2245s sub-woofs can keep up.