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.
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.