I am pleased to offer these Bazooka Bass Tube Model EL604 6 inch subwoofer.  Comes in the original box but it has not been tested.  Looks to be in great shape with no splits in the cone.  

Details:

Add strong and affordable bass to your system with space-saving Bazooka Bass Tubes. Hook up one or more passive EL series tubes to an amplifier with a low-pass crossover, mount your tubes in a corner of your trunk, behind a rear seat, or in the back of your SUV, and experience a new dimension in music.

• 200W 6″ EL Series Subwoofer Tube
• efficient ported enclosure designed for corner mounting in your trunk, hatch or behind the seat of your pickup truck
• mounting straps and hardware not included
• spring-clip wire terminals
• 4-ohm impedance
• frequency response 39-1,500 Hz
• handles 100 watts RMS / 200 watts Peak
• sensitivity 100 dB
• dimensions: 18″L x 8-1/4″H x 6-7/8″W
• what you see is what you get