HK L SUB 4000 A High Powered speaker, Based on Line array technology. L SUB 4000 A is the flexible new 18" subwoofer from HK Audio. Compatible with all LINEAR 5 fullrange speakers and mid/high units, its powerful low end — ranging from 30 to 100 Hertz — is totally and powerfully impressive. L SUB 4000 A can also serve as a sub-low add-on to LINEAR SUB 2000 to beef up the bottom end in the range of 30 to 70 Hertz. Powerful and Versatile 18" subwoofer Birch Multiplex 15/18 mm, 9/13 ply 1200 W 31 Hz – X-Over 137 dB half space 1x 18" (4 ohms) with 4" Voice Coil Compatible with all LINEAR 5 fullrange speakers and mid/high units Sub-low add-on to LINEAR SUB 2000 Model L SUB 4000 A Max SPL 135 dB half space (@ 10% THD) Max SPL peak 137 dB half space (@ 10% THD) Max SPL calculated 138 dB half space Frequency response +/- 3 dB 39 Hz – X-Over Frequency response -10 dB 31 Hz – X-Over Power Rating 1200 Watt Subwoofer amplifier 1200 Watt @ 4 ohms Amplifier Class D Active protection circuits Undervoltage Protection, Thermoprotection, Short Circuit Protection, Overcurrent Protection, Subsonic 24 dB/oct., Peak Limiter LF Speaker 1x 18" featuring advanced ventilated voice coil gap Cut-off Frequency active 70 Hz /100 Hz variable with 24 dB/oct. Connections 2x XLR–1/4"-Combo In, 2x XLR Thru, 2x XLR Mid/High Out Input Sensitivity +4 dBu @ Gain Centerclick Pole mount 2x M20 Handles 8, Integrated Casters optional 100 mm Enclosure Birch multiplex Grille 2 mm metal grille backed with black acoustic foam Finish Acrylic enamel, black Optional accessories Protective cover, TiltUnit Dimensions (WxHxD) 91 x 51 x 81 cm Weight 59 kg/130.1 lbs