amplifier

I need help installing a subwoofer and amp. Everything I have seen has been B&O system and I don’t have that. Also I dont I am trying to wire everything in the cab because I can’t find a way to fish wires from the door into the cab. Where can I find the front left (+-) and front right (+-) wire...

Component selection and overall design concept This is going into a 301A non-B&O equipment group package. I've settled on the behind the seat space for a few reasons, roughly similar to the area the B&O sub would go, and I will be custom building the enclosure to make the most use of the area...