The powerful Blackline Series S218 sub-bass system has been designed to be used with large scale Blackline F12 and F15 systems to extend and increase the total low frequency output power. It can also be used as the low frequency section of a bi-amped or tri-amped H3 system. The S218 provides good bass punch with extended sub-bass output from two new, long-excursion, 18" (460mm)/4" (100mm) voice coil drivers with water resistant cones and triple roll surrounds. TECHNICAL SPECIFICATIONS Type: dual driver, vented sub bass system, Drivers: 2x18" (460mm) / 4" (100mm) voice coil LF drivers, Frequency response: 35Hz-150Hz?dB Rated Power: 1000W AES, 4000W peak Impedance: 4 ohms Sensitivity: 102dB, Maximum SPL: 130 dBcontinuous, 136 dB peak Connector: 2 x Neutrilk NL4 Protective Grille: Black perforated steel Dimensions: (W) 561 mm * (H) 1066 mm * (D) 780mm Weight: 87kg