Model: C-810 C-820 C-830 C-840 Rated power: 10W 20W 30W 40W Line voltage: 100V 100V 100V 100V Sensitivity(1m,1W) 89í+3dB 92í+3dB 93í+3dB 94í+3dB Frequency response: 100-20KHz 100-20KHz 100-20KHz 100-20KHz Dimension(mm) 258x151x125mm 378x151x125mm 498x151x125mm 618x151x125mm Material: Aluminum Aluminum Aluminum Aluminum Weight: 2Kg 3.0Kg 4Kg 5.0Kg