I have a 2003 4runner, JBL system with RSD, the subwoofer located in the back side pannel blew and needs to be replaces. I do not want to go through the expense of replacing the whole unit like toyota recommends which includes the box, amp and sub $450. I would prefer to just replace the speaker, but i need the proper specs to do so. I can't find any information on the speakers, does anyone know what the impedence for the sub is. Thanks the help.