TPA3116 Bluetooth 4.0 Audio Receiver Digital Amplifier 2.1 Channel amp Board Power: DC12-25V Power: 2X50W + 100W Subwoofer Size: 85x125MM Support model: analog inputs and Bluetooth input 2 ways Subwoofer state at rated voltage 24V can be driven 2-16 ohm subwoofer, unique&lt;