Subwoofer looks great but makes a really crazy sound that sounds like a rattle kinda that's not meant to be there seems to be coming from the magnet . Is it blown :
How Do You Tell if a Home Theater Subwoofer Is Blown?
Blown Subwoofer Repair | Audio
How to Fix a Blown Subwoofer | Subwoofer Cone Repair - Subwoofer Mag