car audio set up.. hlp

[yobob123]

Hi,

As of now, I am not satisfied with my audio system installer. I have a distortion or static so annoying especially when on gear revolution. I have a Nissan sentra lec 92. I only want a good, clear, quality audio system on my car. Consider me as a grade school student when it comes to car audio system. No ambition for competition. I have the following audio system:

Head unit- pioneer……DEH-P4750MP
Speakers… MB Quart 6.5" 2-Way Discus Coaxial Driver Speakers DCD 116
(160mm) 4Ohms 50-120Watts
MB Quart 6x9" 3-Way DISCUS Triaxial Speakers DTC 169
4 Ohms 60-140Watts
Amplifier….. Alpine V12MRC-F-805
Subwoofer… Kicker 12” ES

Question:
1. will this be enough to set up?
2. do I need another amplifier? What type if I need to? Another v12 ? a mono?
3. do I need a crossover?
4. current: will this not affect the cars alternator?
5. design: will the two way speakers in front side door and triaxial on the back ok?
Subwoofer in the trunk. You have better design?
6. should I decide to add another (speaker) separates, what then?
7. and finally, should I go back to my installer or find another one?

Pls help. Thanks.
Regards from The Philippines!

YOBOB