Need to get help from ICU Sifus, I've just recently installed the following items from in my car:

1. Hertz Dieci DPK 165.3 (80w) component speakers
2. Hertz Dieco DCX 165.3 (50w) Co-axial speakers
3. Android Head Unit (TS18, UIS8581A system, Advertised output 50w*4, built in DSP)
4. Roadmark 400w Underseat subwoofer

Problem:
I noticed the front component sounded very bright (very clear vocal and also a lot of trebles), most of the sound coming out from tweeter, while the woofer mounted from the door is quite weak even i stick my ears next to the speakers. And the woofer also not giving out much mid and bass as well. Most of the bass are coming out from the underseat subwoofer alone.

I have tried sending back to the shop, and they tuned the built in DSP and EQ setting but I don't really feel there's much improvement.
Initially I wanted to install JBL stage 3 component and co-axial and now I am not sure if things would be better if I went with JBL at the first place instead.

In this case, what are the possible reasons? Is it that I have to consider an external DSP instead?
Can DSP make the sound to be more balance without changing the speaker?

This JBL Stage 3 component with Blaupunkt under seat sub and Crossfire A6 pro by Pete’s Audio in Subang

Sound tuned to “emperor seat”

wrong phase confirm. not brand issue.
bass clash between front-behind door or subwoofer.
use fone app running test tone will realize very easy.

swap positive /negative will solve it

maybe d shop prefer this effect. but cannot listen to it long hours. sure kena ear fatigue because our brain know all these noise are incorrect

so u make sure front phase woofer-tweeter is pairing well first. then only we move on to rear.
finally subwoofer