Product Description AS-218 is designed with symmetry magnetic circuit. And it could improve the reliability greatly. The system is as attachment of the different system to make the sound to perfect on the low frequency. When the system equipped with other sound systems of AS to be suitable for large-scale disco, touring, gym and larger theater as PA application. Product Feature 1. High-quality deep and powerful LF PA system with a max SPL up to 130dB 2. Reflex enclosure with low distortion 3. Two 18" LF driver 4. Partner with AS full-range series to form high-quality sound reinforcement systems 5. Competitive price in sales Product Specification/Models 1. System:Sub-Woofer loudspeaker system 2. Frequency response(?dB):35Hz-300Hz 3. Driver quantity:Low DY-A181006x2 4. Impedance:4Ohm 5. Sensitivity:105dB 6. Maximum SPL:133dB 7. Power handling:800W 8. Peak power:1600W 9. Nominal Coverage angle(HxV):NxA 10.Dimensions(WxDxHmm/Pcs):590x730x1170 mm 11.Connectors:2xSpeakon| connectors (NL 4) Application 1. Subwoofer for large-scale sound system 2. Large-scale Disco 3. Touring 4. Arena and Stadium