Running new rear speaker wiring and audio install

[Sheefa]

Hi all

 

Looking to completely revamp the audio setup on my Supra as its pretty crap. I’m not looking for a crazy install but I have purchased the following:

 

Pioneer SPH-DA230DAB 7” Apple CarPlay headunit

 

Pioneer GMD9705 2000W Max 5 Channel D Class Amplifier

 

Audison Prima Component Speakers 6.5” for Front

 

JBL GX602 Coaxial 6.5” Rear Speakers

 

I’ve run new wiring to the fronts and amp is going under front passenger seat replacing current 2.1 channel one. I will run new 4awg cabling to it.

 

I want to use all the RCA outputs from headunit to amp and want to run some new rear speaker cabling to amp. Do I need to strip the rear interior completely to access the speaker wiring ? I can’t find a guide to replacing the rear wiring anywhere other than people saying it’s a ballache. I could tap into the existing OEM wiring loom I guess but the stock wiring is so think I want to run some decent 16gauge stuff.

 

Any helps or tips would be appreciated. This is my current mess !