Review on High-powered Bluetooth Amplifier Board with Treble and Bass Control - 100W+100W, DC 9-24V, BT and AUX Inputs, DIY Stereo AMP Board for Wireless Speakers by Eric Hartman

Please don't let the size fool you, it's amazing. It's very pound and crystal clear. I installed it in the fairing of my bike. I really didn't want to put a noise block and do a lot of cut outs. So I tried this device and was very impressed. I went one step further and installed a 12v to 24v boost converter. This little box drives two 4" speakers and two 4x6" speakers. Each speaker has an impedance of 4 ohms but I connected them in series giving them an impedance of 8 ohms. It drives all four speakers hard. Do not doubt this device. Bluetooth works very well. I have no complaints.