Best i ever heard was a Harmon Kardon demo system in a Merc. A real attempt to get quality sound in a car which is near impossible of course.
Most dont want quality just loud & lots of bass & thats easily achieved.
Dont see you as a real head banger Dojj but if you are 4 18" drivers about 2" from your ear & 4 10KW amps will make you cool to many.