I have a pair of KG 5.2's, one with a blown KD-121 passive 12" woofer. Can't find a replacement anywhere; $80 to get the woofer repaired; I was thinking of selling the pair anyway. Any ideas on where I can find replacements, or whether there are drop-in substitutes? Is there any market for the spare parts if I just tear out the good parts from the speakers? I'm really torn on what to do- any thought are appreciated.