Adding 4 channel amp to existing mono amp.

[connorschaid]

I am going to be replacing my 4 bose speakers after the passenger rear one blew.
I have Bose but not navigation(stock head unit), i already have a mono amplifier powering two subs(wired using LOC). The amp is located under the passenger captain seat.

What is the best/ easiest way to get power to a four channel amp to power the speakers in the doors?

Also considering adding new head unit if that makes a difference at all.

I will be doing the install myself.

---------- Post added at 04:53 PM ---------- Previous post was at 04:41 PM ----------

Here are pictures of what i have right now.

 

[livingez_123]

Now would be the best time to replace the head unit and remove all of the Bose equipment. This way you have a clean slate to start with. you can run any amp and speaker combo you want.