There aren't any speaker cables as such at the headunit. They are low level feeds to the amp, which then supplies the high power outputs to the speakers and the sub woofer on the rear shelf. By bypassing the amp, I fed the speakers out through the headunit low level feeds and then just bridged them straight across to the high power speaker cables by the amp. I removed the amp and sub and have a vibe active sub in the boot. I don't have access to my wiring diagrams at the moment but I would guess the antenna main power feed could come via the amp. From what I remember, the amp has it's own heavy ampage fused feed, with just a low power "switch on" feed from the head unit.