We are manufacturer, professional loudspeakers. 1, 1000W 2,102dB 3,Wooden materials. 4,2* ... /bass2*18''Frequency response30Hz--150HzRated power1000WSensitivity102dBPeak impedance4ΩWe are manufacturer, professional loudspeakers.1.1000w2.102dB3.Wooden materials.4.2*18'' woofer ... amplifiers. such for KTV rooms, Clubs, conferences systems, DJ bars. Professional loudspeaker