Upgrade JBL system, amp questions

Thinking of doing an audio upgrade, way into home audio, but novice at car audio. I have the JBL in my 2020 CM. If I replace the door speakers,both front and back with components (looking at Hertz) and replace the factory sub, add a 5 channel amp, and still want to keep dash speakers functional, will I need to keep the factory amp in place? I am a little confused on this.

I won’t be doing the install, I’ll take it to a local guy who does installs but doesn’t sell the equipment So I’ll have to buy everything first. I don’t think he’s done a newer tundra yet.

 

Email James@tech12volts

tech12volt@gmail.com

he’s the resident guru

he also has an audio package group buy under the audio forum

 

Sounds like a good idea for any who wants to upgrade what was purchased from the dealer - new?