Ok, my mate has a Diesel Fiesta work van and has asked me to cut and fit a board behind the bulkhead behind the seats to fit a pair of speakers. So my question is, how do I wire in the speakers to the headunit? There's no loom for rear speakers as far as I know only speakers in the front doors. I dont think I can splice into the each front speaker wire to run to the back.
It has an aftermarket headunit so I imagine there's facilities to have at least 4 speakers, then amp opportunities. How do you add speakers to a car/van that hasn't catered for such a situation?