The compact ALPPWE-S8-WRA amplified subwoofer system lets you add deep, accurate bass to your sound system without taking up much space in your vehicle. With the ALPPWE-S8-WRA, the high-excursion 8-inch subwoofer and 120W gives strong bass output. More Bass, Less Space. With a shallow mount, the ALPPWE-S8-WRA is just 3-inches deep (at deepest point), 13.5-inches wide and 9-inches tall - completely application ready. This compact subwoofer system works well under or behind the seat of a pickup truck, in a sedan trunk, or in the hatch of an SUV. Not Just Small And Strong, But Also Durable. The ALPPWE-S8-WRA Compact Subwoofer was designed in a cast metal construction for ultimate durability and performance. The side panel offers easy access to RCA and auto-sensing speaker inputs. The side panel also gives access to Phase, Gain, LP Crossover and Remote Sub Level controls for greater flexibility during installation.