Sound Ordnance™ B-8PTD 125-watt compact powered subwoofer at Crutchfield
8" Powered Subwoofer in Vented Bass Tube Enclosure For 1987-95 Jepp Wrangler YJ
8" Powered Subwoofer Sub Bass Tube+MP3 Input+Amp Kit For Jeep Wrangler 87-06 | eBay
12v 24v 220v 8inch 480w Car Audio Active Subwoofer Bass Tube Rgb Led Bluetooth Speaker Box Hifi Car Home Amplifier Speakers Bass - Subwoofers - AliExpress
Bazooka BTA6100 BT Series 100-watt powered 6-1/2" Bass Tube® at Crutchfield