Soundsphere Q-SB2 Sub-Bass Supplements Loudspeaker, 1600W Max. Program Power, 800W Max. Continuous Power RMS, High Sensitivity 99dB 1W/1m, Frequency Response 40 Hz - 200 Hz High Power Handling Capability (800W/4 ohms) High Sensitivity (99dB 1W/1m) High SPL Capability (128dB 800W/1m) Transducer - Low Frequency Driver: 18" Treated Pulp Fiber Horizontal / 360 Coverage Angles