Didn't you get these within the last year or so right from Axiom? If so they should be under warranty still. Call Axiom and they should send you a replacement tweeter.

2xM80 VP180 2xQS8 2xM3 HSU STF3 LG 60PS11 Denon 3808 ATI 1506 LCR 2xATI 1502 Oppo BDP-83