i have had a few systems.
77 chevy pickup. 2 knob radio, majestic eq, and two kicker stillwaters ten boxes.
same truck with the tweeters, mids, passive crossovers out of kenwood 8 truck boxes
tweets in the dash mids in upper door panel. pyle pounder 8s in bottom of doors
which was all ran off of a pyramid pb300. big long alpine 2 chl amp on series 1 10s in sealed boxes.
1982 cutlass wagon [like malibu wagon] eclipse indash, clarion 4x6 plates on kenwood kac 720, 4 pyramid tweeters on stereo leads, punch 150 on 4 sony component 6.5 woofers, 2 punch 200ix on 6 jl wo 12s in one sealed box, with one battery and 3 one farad caps high output alternator.
1997 chrysler sebring pioneer cd player, sony 6.5 in doors, pioneer 300 watt kevlar two way 6x9s in deck on punch 100dsm, kicker 15 cvx dual 2 ohm on mtx 1500.1 mono. in sealed up spare tire well.
last one 1992 olds custom cruiser wagon [like caprice]. cant remember which component sets i ended up with but they ran off of big alpine 4chl digi read out, sound stream bx-15 bass driver going to two jl 1000/1 amps, each amp going to one kicker l7 15 dual 2ohm coils.with one yellow top battery.
now i am just messing with 1981 bronco with volfenhag 6.5 doors 6x9s on jensen radio, and 2 cubic foot sealed box with a boston spg555 on a punch 200ix.