Recommended with Single 10-12 inch 250W-300W subwoofer speaker The 350W subwoofer power amplifier board uses the disassembled tube and has a very high signal-to-noise ratio. No noise can be heard without plugging the input line.It also has full relay protection,such as power-on delay,DC output,horn short circuit,etc. The whole body adopts the front and rear stage split design,which is convenient for DIY installation,and the pre-stage low-frequency processing capability is strong. Can be used with a variety of low speakers,connected to passive speakers can be used. Model Number:350W Subwoofer Amplifier Board Channels:1 Working voltage:double AC24-28V Output power:350W Chip type:Sanken Channel type:Mono Colour:Green Material:PCB+aluminum+components Package Contents: 1 * Subwoofer Amplifier Board with cable Only the above package content, other products are not included. Note: Light reflection 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.