Back in the day (late80's and early 90's), I had a top of the line Kenwood cd changer with tuner pack, 2 pairs of ADS separate speakers (5 1/4 inch mids and dome tweeters), 2 15 inch Cerwin Vega subwoofers, 2 JL Audio 10 inch woofers, a 75wpc 4 channel Soundstream amp for the ADS separates, 2 Soundstream 100wpc 2 channel amps wired in mono for the subwoofers, and a 50wpc Soundstream amp wired in mono for the center fill. I also had a Kenwood 10 band graphic eq built into the dash as well as a Audio Control eq in the trunk to tune the speakers. I used all Phoenix Gold (was high end) interconnects and speaker wire. I also had a deep cycle marine battery in the trunk in conjunction with a 1 farad capacitor for storing energy and a dual charging system with high output alternator.
All this was shoehorned into a 1984 Nissan Sentra. I won many trophy's at various events as well as a 1,000.00 store credit for winning Tweeter HiFI car audio loudness war. All this came to a cruel end on the night of December 25, 1991 when the car was stolen out of my driveway. My car was found a month later in a housing project in another part of the state, stripped to the bone. They even took my gas cap and used air cleaner element.
Since then, I have focused on my home system. I had over 6 grand invested in the car system and lost everything. I did all of the work myself.