SUBWOOFER FOR PA (SELF-AMPLIFIED) 'Self-powered subwoofer system. Compact and lightweight acoustic cabinet made of 16mm MDF. It is optimally combined with the Linear 3/5 series systems. Can be used as a bass extension for Elements Big Base systems. Speaker: 1 x 18''. X-Over-Bass: active diplexer that allows the upper limit frequency of the subwoofer to be varied. Frequency response: 42 Hz – X-Over (+/- 3 dB), 38 Hz – X-Over (-10 dB). Amplifier: class D. Power: 1200 W. Active protection circuit: undervoltage, thermal protection, short circuit, overload, subsonic 24 dB/oct., peak limiter. SPL Max.: 132 dB @ 10% THD peak. Cutoff frequency: selectable 100/120 Hz 24 dB/oct. Connections: 2 x XLR-In, 2 x XLR-Thru, 2 x XLR out. Attachment points: 1 x M20, 4 x lugs. Metal grill with black acoustic foam. Dimensions WxHxD: 51 x 67 x 72 cm. Weight: 42kg. Finish: acrylic enamel, black.'