I just bought a used pair of martin logan vantage speakers. they were working great until i changed my amp and plugged in my rca cable with the amp powered. i heard a loud noise at the rca connection. and since then one speaker has played louder. i tested the speakers individually and one is damaged.it has messed up the imaging. right now i have added 4dbs for a temporary solution from my processor to try and even out the sound .looking for repair solutions ?