I acquired a pair of these and the one cab works fine, but the other has the mid out. I know the driver is fine because it works when wired direct. Would a bad cap stop the signal from passing or would it have to be the inductor ? I have tried the speaker connector for fullrange and the biamp ones and nothing from the mid. Here is the schematics if anyone can help . - http://www.jblproservice.com/pdf/SR-Series/SR4738.pdf