Kicker built the 45CWTB104 tube-shaped enclosure out of tough ABS plastic that’ll stand up to the stresses of car life. The tubular shape pushes bass frequencies into the air like a cannon, pumping deep, resonant sound into your vehicle and your ears. You can mount the enclosure vertically or horizontally, letting it tuck neatly into a corner of your trunk or cargo area. Spring-loaded wiring terminals make it easy to connect the wiring from your amp.