I have a 2002 mustang GT w/ a mach 460 system. i took it to best buy and they said my woofer is blown in my door. the speaker area near the feet. what is a woofer? subwoofer? if so he said not to replace it w/ aftermarket bc he has seen aftermarket freak out the mach system. he said that the OEM part would be 30-40$ anyone tell me what i blew, and where is a good place to find OEM speaker parts like mine that was blown.