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Case size: Primary:W150*D270*H215mm,Vice:120*120*110mm;Control:volume, low tonge, switch;speaker unit:4"20W*1*5W*2;input sensitivity:≥65db. S/N:410mV. Distortion:0.4%1W 1KHz. Frequency response:80Hz-40KHz. output power:20W*1+5W*2