S15B-B is a single 15" musical instrument speaker well matched to electric bass, or acoustic bass. It is a larger enclosure for more robust low frequency reproduction. It has damped spring loaded handles, a coated steel grille, and an 18mm thick birch plywood cabinet finished with hand rubbed oil, making it a beautiful, portable and durable speaker enclosure. It is convertible from a sealed box to a vented box by a removable vent cover on the baffle.