Ima go ahead and post the 3 systems ive had (only had my car a year) and yeah
2 Audiobahn 10's and a Insignia amp = Pure trash
2 CVX 12's with a Kicker ZX750.1 = Wasn't a bad combo, but ended up blowing up a CVX and replaced it then sold the setup.
Current setup JL Audio 500/1 and 2 Alpine Type R 1242D's. = System slams, easily hits twice as hard as my kicker setup. Maxed out a 130dB mic with the amp set flat. System actually hits too hard for the hatchback, hurts eardrums, shakes the car apart etc. Its for sale actually.