need help!

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I have problem in my car audio that I couldn't solve so far. :( :(
I have 03 G-class and I did upgraded the sound system with no luck to have near to authentic/oem luxury car sound
system.
I did the following:
- Replaced the head unit with an after market one that promote some of the new features such as AUX and Bluetooth.
-Alpine PDX-M6 Mono Channel powered MOREL Primo 124
- front doors Morel 6.5 (hyperd) speakers.
- rear doors Morel 6.5HYBRID INTEGRA.
- Infinity REF3002CFX 3.5 (center speaker).
- Oem twitter (later replaced)
-MB Quart DA1-2000.4 2000 watt RMS 4 channels.
Here are the problems:
- During the installation I lost the Infinity speaker "got blown" and the front speakers , the guy who did the installation dunno why that happened.
- The sound quality is normal you cant tell that there is high quality sound system in the car compare to any oem car has some known names of equipment.

due to that I did changed the front speakers and twitters with that brand:
CRITICAL MASS CM654A 6.5'' SPEAKER AUDIO COMPONENT JL

To be honest I didn't not notice any difference!!! I know there is somethng wrong!
I dunno if it`s from the head unit "chinese brand". or the amplifier!
should I change the amplifier with to 8 channels! in order deliver indented signal to each speaker!
Hoestly I am lost and I duuno how I can have real sound system.
any idea will be appreciated
thanks!
 
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