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Specifications: Speaker impedance: 4-8ohm Supply voltage: DC 12-24V Chip: tpa3116 * 2 Channel: 3 channel (left, right, bass) Output power: 50W * 2 + 100W * 1 subwoofer Output matching: 4-8 ohm Audio output: terminal Frequency response range: 14-100khz SNR: 100db Switching frequency: 1.2mhz Size: approx. 100*92*28mm/3.93*3.62*1.1'' Net weight: approx. 118g Note: Please allow 1-3mm differs due to manual measurement. Due to the different display and different light, the picture may not reflect the actual color of the item. Thanks for your understanding. Package: 1 x Digital Subwoofer Power Amplifier Board Module 1 Set Screws