So...

I bought one of these head-units.

http://nz.jvc.com/car/av_receivers/kw_m950bw/

Now this can take an tv box, was just wondering if anyone has had any success hooking up a tv box to their head-unit or even to any head-unit?

This one requires a RCA to mini-jack, I've tried two different mini-jack cables which don't seem to work with it so I think you need ones JVC made specifically for it just to be d*&(s.