The SRX818SP is a powered portable subwoofer in the SRX800 series from JBL Professional. It has been designed to deliver class leading performance in a variety of applications including small and medium sized installations and tours. When used in conjunction with the SRX800 full range systems and other SRX800 subs, SRX818SP in an integral part of a high performance, fully configurable loudspeaker system Features JBL premium Transducers. 1000 W highly efficient Crown Amplification Full User Configurable DSP Maximum SPL Output: 135dB System Type: Self powered 18Äù, subwoofer system Frequency Range (-10dB): 29Hz - 150Hz Frequency Response (- 3dB): 35Hz - 120Hz Network Control JBL Engineered Application Presets LCD Screen and glow in the dark ink on back panel Accepts the JBL WK-4S caster kit M20 Threaded pole mount Lightweight poplar plywood cabinets made structurally sound with tongue and groove joints and protected by JBLÄôs tour proven DuraFlexÑ¢ finish Specifications System Type: Self powered 18Äù, subwoofer system Max SPL Output: 135 dB Freq. Range (-10 dB): 29 Hz - 150 Hz Freq. Response (-3 dB): 35 Hz - 120 Hz Coverage Pattern: Amplifier Design: Class D Power Rating: 1000 W Peak Dimensions (mm): (H x W x D) (in): 575 x 684 x 683 (22.62 x 26.92 x 26.89) Net Weight: 39.5 kg (87 lb) Watch: The JBL SRX800 Series