Case size: 
Primary:W150*D270*H215mm,
Vice:95*95*150mm; 
Control:volume, low tonge, switch;
speaker unit:4"20W*1*5W*2;
input sensitivity:≥75db. 
S/N:450mV. 
Distortion:0.3%1W 1KHz. 
Frequency response:35Hz-18KHz. 
output power:20W*1+10W*2 
IC:2030*3.
Color:black and red.