I'm about to fit a basic system in my car, I've fitted countless car hifi systems in the past but haven't done one for a few years and I'm a little stuck. I'm fitting a Sony CDX-F7500 head unit, an Alpine MRV-F300 2/3/4 channel amp, Alpine components up front, and a JL Audio sub in the boot. The components will be connected to 1/2 channel, and the sub will be bridged on 3/4 channel, the bit I'm stuck on is... on the back of the head unit I have front, rear, and sub outputs, obviously the components will go from the front out, but is it best to connect the sub to the rear output or the sub output?