Connecting 4 ch amp to head unit, 4 speakers 1 sub

[Twistedmister]

If you decide to run the front and rear speakers off the amp, channel 1 and 2 and the sub off 3 and 4. This will have you already set if you get a 5 channel and will probably sound a little better than running the rear of the deck.   Your wires will be ran and you wont have to pull everything apart again of you decide to do a 5 channel.