SMSL-SMSL-SA60-black-60WPC-Class-D-Digital-Amplifier-Black

About Volume Control: The volume use the rotary encoder to control the volume, Rotate Clockwise to increase volume, Anticlockwise to decrease. If the SA-60 work as a pure amplifier, just turn the volume to MAX. The SA-60 has the memory for the volume, and it will limit to a fixed value if the volume is too high when start up. About LED :The LED Up: RED Power OFFGREEN Power ONRED+GREEN Power ON + Loudness ON The LED Down: RED 3.5mm input Green RCA input About output :The SA-60 use the BTL connection way. So the "Speaker-" terminal cannot swap or connect to the amplifier housing. Technical Parameters Output Power: 55W + 55W (8 OHM @ 10%THD+N)THD+N : <0.1%SNR: >100dBCrosstalk: <-100dB (1KHz)Frequency Response: 20Hz - 20kHz (-3dB)Max Gain: 37.5dBPower: DC18V - 24VSpeaker Impedance:3 OHM - 16 OHM