Revel Salon 1 mid range drivers

Take them off and see if they are labelled by the manufacturer.

Also, turn them 180 degrees. If the suspension has weakened, this may balance it out. While they are out of the cabinet, inspect the suspension near the magnet, see if that has deteriorated.

Thank you!!! erik_squires  

Sounds like the same problem Infinity had with the midrange they used in the prelude and intermezzo speakers where the neodymium magnet starts to peel and scrape against the voice coil causing distortion, the buzzing/scraping sound is easily heard when playing piano music