Features and Benefits Down-Firing Sealed Enclosure with a Passive Radiator JBL Club shallow enclosures are engineered with sealed, down-firing type and loaded with a passive radiator subwoofer and new Club shallow subwoofers. Such a design brings tighter, more accurate bass and takes up little space. Removable Feet JBL Club shallow enclosures are designed with removable feet which allows for flexible placement direction to get best performance and optimize space per vehicle type. Removable Logo Badge JBL Club shallow enclosures are designed with a removable logo badge so you can put anywhere you like. Built Tough JBL Club shallow enclosures are designed with sturdy medium density fiberboard construction and rugged black carpet covering to resist stacking weight and take a beating