Your remote turn on wire and rca cables hook up in the back of the head unit then run back to the trunk and hook up into the amp. Power and ground for the amp is extremely simple to run because the battery is right there in the trunk
Battery in trunk is very nice for hooking up systems.
To touch off what was said
wire up your radio harness to aftermarket harness for your car
run rcas/remote wire(tiny blue wire) to amp
run power/ground to battery
wire up subs to amp via correct ohm load for amp
install radio in dash and sub box in location as well as secure amp
to tune amp
have all radio settings flat(at 0) except subwoofer level.
have that one max. This is your preout voltage on your radio.
set gain at 10/11 o clock on amp
sub sonic to minimum
low pass to 60/80 on radio or amp
you are ready to bump
If you need any more help feel free to ask here or pm me