The 11 (279mm) feather-light fiberglass woofer cone with rubber surround delivers the signature kick and punch of JBL bass. The subwoofer enclosure is designed with excellent density and strength die-cast aluminum material for more stable low end extension performance. Whether you're cruising or competing, the JBL Stadium BassHub leaves the competition behind without missing a beat. (64mm) Impedance: Dual 4 ohms Dimensions (D x H): 14-3/16" x 6-1/2" (D360mm x H165mm) JBL CLUB-A6001A High performance mono subwoofer car amplifier Technical specifications: Mono subwoofer car amplifier 350 watts RMS x 1 at 4 ohms (600 watts RMS x 1 at 2 ohms) Class D amp technology Variable low-pass filter (32-320 Hz, 12 dB/octave) Variable bass boost (0-12dB at 45Hz) Phase switch (0, 180 degrees) Preamp and speaker-level inputs 8-gauge power and ground leads recommended - wiring and hardware not included with amplifier W x H x D = 220mm x 51.3mm x 180mm W x H x D = 8-11/16" x 2-1/16" x 7-1/8.