Kenwood's KSC-SW1 subwoofer may be just what you need if you're looking for more bass, but don't have space for a conventional sub box or powered sub. This compact sub features an amplifier that pushes 75 watts RMS to a 6-1/2" woofer, with a 6-1/2" passive radiator built in for good measure. It's all housed in a rugged, low-profile enclosure that will fit just about anywhere. The passive radiator technology is one of the keys to the surprisingly big sound of the KSC-SW1. Air pressure from the powered woofer moves the unpowered 6-1/2" radiator, augmenting the bass response.
Powered, enclosed subwoofer with 6-1/2" driver and 6-1/2" passive radiator