[Driftaround]

Hi all. New to the site.
Had a quick look around, with no success, either here, or on YouTube.

Wondering if anyone can point me in the direction of a guide/video to demonstrate how I can fit a 4ch amp to my base system, along with the uprated speakers and woofers I've purchased?
I understand there's an issue with the wiring at the subs, because the wiring is parallel to the front speakers?
I've not experienced this before, so would welcome any help you can give.
Thanks
Ian