Background: 15 years ago, I had a 1997 Chevy Tahoe with 2x JL Audio 15" W3's powered by 2x JL Audio 500/1 amps and then 4x MB Quarts (don't remember the model, but they were high quality speakers) in the doors, powered by a JL Audio 300/4. The head unit was an Eclipse CD-8506 and I had an Alpine...