after buying the top speaker, (which was blown too) I called and spoke with a tech here @ polk and was advised to send in the amp for repair. In disassembling the cab, I decided to remove the foam in the top half and there was the meanie..bold and fried....the cross over in the top section is blown to heck. Praying someone will be able to help fix or replace this part?? Any help will be appreciated. Fingers crossed.