Professional power amplifier Frequency response20hz-20khz Impedance47 Thd (1khz, aux 150mv input)_0.1% Sensitivity180mv Average power(4+)350w+350w S/n90db N.W.10 kgs/ 22 lbs G.W.12 kgs / 26.4 lbs L - w - h, box:16.9"-14.2"-5.7" / 430-360-145mm L - w - h, package: 18.5"-15.7"-7.7" / 470-400-195mm Colors ˜ silvery / ˜black