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This is a Ne5532 preamp tone board that needs to be used with the power amplifier board. It can adjust the high and medium bass of the sound source. So you can have a better experience. It can adjust the high and medium bass of the sound source Supply Voltage: DC12V-25V AC9V-18V; Frequency:20-20KHz Potentiometer adjustment function:Treble+Mediant+Bass+Volume