Oxygen Audio Alium 380 15inch Subwoofer, 330 Watts, 85 oz Magnet (O2 Alium380) (SINGLE PIECE)
Don't buy this speaker i believe the magnet cover causes damage to the magnet it;s screwed to the magnet only & during shippment( i believe ) puts stress on the magnet causing it to crack  speaker is destroyed ! Dealer  is very slow to respond wants me to pay both ways (says he will credit me ) sorry not good enough !  I've used speakers for 25 years never have i seen a cracked magnet on a speaker . Run from  this one !