undo the binding post cup on the back of the spkr, and check the wire attatchments inside, tighten the nut on the back of the binding posts inside. easy enuff to do start there. check your amp too, L&R replace the spkr wires to check.
I have a pair of B&W Matrix 801 S3 with a non play
ing MF driver. The HF and LF drivers sound fine. The problem is not in the MF driver. When switched to the opposite speaker it sounds fine. It appears there is no power in the wires. Broken wires seem likely culprits, as does a faulty cross over. Any advise?