The compact Blackline Series S18 sub-bass system has been designed to be used with Blackline F12 and F15 full-range systems to extend and increase the total low frequency output power. The S18 provides good bass punch with extended sub-bass output from a new, long-excursion, 18' (460mm) / 4' (100mm) voice coil driver with a water resistant cone and triple roll surround. The S18 is provided with a top hat fitting that can be used to pole mount an F12 or F15 above the enclosure. TECHNICAL SPECIFICATIONS Type: Compact, vented sub bass system, Drivers: 1x18" (460mm) / 4" (100mm) bass driver, Frequency response: 40Hz-120Hz?dB Rated Power: 500W AES, 2000W peak Impedance: 8 ohms Sensitivity: 99dB, Maximum SPL: 124 dBcontinuous, 130 dB peak Connector: 2 x Neutrilk NL4 Protective Grille: Black perforated steel Dimensions: (W) 561 mm * (H) 690 mm * (D) 595mm Weight: 45kg