ITEM NAME:Audio Amplifier Board Module AC 12-32V 100W For Loudspeaker Loudspeakers img *{margin:0;padding:0;.1x Audio Amplifier Board. Compatible speaker:4-8&;,50-200W,3-10" bookshelf speaker and floor type sound box. Switch machine mute,over heat protection, short circuit protection. Power input:Double AC 12-32V,100W.