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. Note: 1. Please allow 1-3 mm error due to manual measurement and 1-3g weight error make sure you don't mind before ordering. 2. Due to the lighting of the photos and the difference of monitors, the pictures may not reflect the actual color of the real item. Please make sure you don't mind before ordering, thank you! About Shipping: 1.please pay attention to your delivery address such as: name, street, house number, doorbell/email without name, etc. is correct, or the order will not be delivered correctly. 2.All items will be shipped within 3 business days after the payment is received. Most times you will receive them within 8-12 days then. The specific delivery time is depend on circumstances. 3.During the shopping process, if you have any questions, please feel free to consult us, we will reply you within 24 hours Hope you have a pleasant shopping experience!