Well in the Pathfinder....
I have
Dual DVD/Navigation Flip Out Monitor
Kenwood 4042-A Graphic Equalizer
2 5x7 MTX Front Door Speakers
2 6x9 Sony Xplod Rear Speakers
4 Cadence Flash 8 Inch Midrange Speakers
Kicker ZX 750.1 Amplifier
Kicker DX 400.4 Amplifier
Kicker ZX 650.4 Amplifier
3 Pyramid 3 Inch Tweeters
1 Aapex 3 Inch Tweeter
2 15 Inch Sony Xplod Subwoofers
1 5x15 Inch GMI Pro Sound Horn
Diehard Platinum Battery
2nd Battery Everstart Max
All In a Custom Built Rhino Lined Enclosure
WITH STILL OVER 2 FEET OF TRUNK SPACE REMAINING !!!!