Output Power: 40W(20W*2) Frequency Response: 40Hz - 20KHz Channel Crosstalk: >45dB S/N Ratio: >75dB Product Size L150*W169 *H225mm Packing Size: L380*W480*H550mm Packing: 4set/carton Q`TY 20′: 1117set 40′: 2313set 40′HQ: 2712set