im looking for a suitable replacement for one of the low freq woofers in the 328ai. i own 4 of these and one fell off a stage and managed to split the magnet. the other woofer and coax work fine. just a perfect hit i guess. presonus will not sell me a new woofer and i cant afford to ship this 85lb speaker back to them and pay $310 bench fee for one woofer.. thanks