I have a pair of (recently refoamed) CX100's, the left woofer of which is not outputting sound. No obvious failure state -- the driver seems suspended evenly, well supported by the surround and not crashed into the side or otherwise damaged. A continuity traces shows a connection between the + and - terminal, so I think it can't be a broken internal connection.  (Swapping in the other woofer results in correct sound!) Any ideas for troubleshooting a woofer in this state?  Thanks!