10-26-2009, 12:15 PM
Sounds to me the like voice coil is rubbing against the magnet. Over time the suspension on a large woofer can sag causing this to happen regardless of usage. Try removing the speaker and rotating it 180 degrees in the cabinet, or if the magnet part on the back of the woofer is removable (if it's a Black Widow speaker it is) you can try unbolting it and rotating that instead, but either way you would need to take of the fabric grille and unscrew the woofer from the cabinet.