100W Subwoofer Amplifier Board;Frequency response range: input: 20 hz - 20 KHZ, output: 20 hz - 180 hzOperating voltage range: DC 12-24V(maximum voltage is no more than 24V); built-in TPA3116 amplifier chip;This is a pre-amplifier, bass frequency processing, with bass volume potentiometer control of the bass amplifier board.DC 12-24V power supply, wide operating voltage, power-saving design, more than 90% power efficiency. Maximum support 100W (Bass) bass channel outputAudio input sensitivity: 500 mv;Speaker impedance: bass speaker impedance: 2-8 ohmYou can use a good switching power supply adapter, laptop switching power supply, or rectified filter former power supply, you can also use rechargeable batteries, or vehicle power supply and so on.size:83 x 55 x 29mmMaterial:plasticcolour:blue Package Contents:1 x Audio Amplifier BoardOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.