mine looks to be a REV 0 board. Its all in one as well. I've been told twice now it has a bad transducer. I've looked over the board and whatever that is on terminal D12 looks to be bad. Its burnt looking a bit but theres supposed to be 3 soldered connections on it and 1 and gone. Last time I had it together all it did was hum. Does Klipsch offer a repair service? I've got no problem giving this thing a shot. I just don't know what to get and where to start with it.