This 60W Bluetooth power amplifier board (spa-a0) has 30W power in both left and right channels (2.0), with a total maximum power of 60W. It is suitable for pushing 2.0 speakers within 5.25 inches. At the same time, it has a very small volume (length and width are 70x63mm respectively), which can be easily put into most speaker cavities. It uses Lanxun 5.0 Bluetooth master control with two cs8676 (BTL), and uses 15-18v voltage, which can output strong power. Moreover, cs8676 is a high-quality class D power amplifier. While it has excellent sound quality, the electroacoustic conversion efficiency reaches 90%, and the calorific value is very small, so it can not use the radiator. At the same time, it has built-in 4 function keys (channel switching, play pause, volume, up and down), RCA Audio input, 3.5mm audio input (aux), which basically takes into account various use needs, and has very good sound quality, cost performance and practicality. With its small size and unique sealing method, it is very convenient to transform ordinary speakers into Bluetooth active speakers (our company can provide technical support), which is suitable for audio manufacturers and enthusiasts DIY.