Picked up a pair in good shape for $40.00. Found out why too. One of the woofer/midrange's magnet has shifted, so it's DOA, but the other speaker sounds amazing. Pulled the driver, the only numbers, besides dates, was a rubber stamped M5. Looking for replacement options, (may just be easier to replace both) any suggestions? FYI, 3 way system, silver dome tweeter, 6-1/2" midrange 8" passive woofer. No fuses near binding posts. Small sticker with s/n just says Monitor Series 5.