Just want to add a little punch to your bass without a lot of booming and shaking? Clarion's SRV303 powered subwoofer combines a 7" speaker with a built-in 64-watt amplifier in a super-compact ported enclosure. It'll go places where a normal sub won't fit (under the front seat of your small car, for instance), and it'll add new impact and authority to your system.
The low-pass filter lets you adjust the bass to fit your vehicle, while the phase switch maximizes the sub's performance. You can hook up this versatile unit in any car, thanks to its preamp- and speaker-level inputs. And, if you like to adjust your bass on the fly, the control panel is detachable and comes with a 16-foot cable for remote use.