Thank you very much for choosing our products!Please read this manual carefully before using the product. A1001&A3001 Manual Download 100W Front & back surface interface instruction: 300W Front & back surface interface instruction: ①………………………… Turn on/Off ②………………………… Power Light ③………………………… Full frequency/bass working mode switcher ④………………………… Bass cutoff frequency control knob (the knob only works in bass mode) ⑤………………………… Volume knob (increase clockwise and...

Thank you very much for choosing our products! Please read this manual carefully before using the product. A3 Pro Manual Download Front Surface Instructions ①…………………………Power Switch ②…………………………Power Indicator Light ③…………………………Bass Knob （increase clockwise and decrease counterclockwise） ④…………………………Treble Knob （increase clockwise and decrease counterclockwise） ⑥…………………………VOL+/-（increase clockwise and decrease counterclockwise）   Basic version after the panel： ①……………………………Audio In（Such asCD、DAC、MobIle、TV etc，(Such as CD, DAC decoder, mobile phone,...

Thank you very much for choosing our products! Please read this manual carefully before using the product. A502T Manual Download Front & back surfaceinterface of basic Version: ①…………………………LED INDICATOR LIGHT ②…………………………POWER NO/OFF(Press 3S to start, short press to switch bluetooth or RCA input) ③…………………………VOL+/-(increase clockwise and decrease counterclockwise) ④…………………………Bluetooth antenna (bluetooth is optional) ⑤…………………………Input interface of audio (Such as CD, DAC decoder, mobile phone,...