The MP418SP is a powerful, single 18-inch (457mm) subwoofer in a compact bass reflex enclosure with a frequency range of 30-150 Hz. It features an integral dual channel amplifier/ signal processing module designed and built by Crown Audio specifically for it. This provides two channels of power with 660W at 4 ohms. The second amplifier channel can be used to power a full range speaker or a second subwoofer (such as the companion MP418S non-amplified version of the MP418SP). The amplifier module also passes through line level signals for powered satellite speakers.
Roadworthiness is assured through the use of heavy-duty steel handles, 16 gauge-steel hexagonally-perforated grilles, Duraflex finish and four heavy duty casters. The MP418SP also has a pole-mount receptacle for mounting satellite speakers on top.