The PR Sub is a subwoofer for sound reinforcement consisting of a heavy-duty 15" woofer in a vented enclosure. The lightweight-yet-rugged injection-molded plastic enclosure with molded-in stand-mount cup facilitates portable use for augmenting the bass for live music, DJ use or speech. A black powder-coated steel grille provides driver protection and a professional appearance. If you are after a very lightweight sub, to boost a small system, then this could be the box for you!