The Fosi Audio BL20C is a small, efficient and affordable Class D amplifier based on a TDA7498E chip, allowing it to develop a power of 2x150W under 4Ω. In addition to a stereo RCA input, the BL20C provides USB-A Host to connect a storage device such as a USB flash drive as well as Bluetooth 5.0 reception capability, so it is possible to stream your music and control the playback wirelessly directly via a smartphone or tablet for example. On the output side, in addition to the speaker terminals, the amplifier offers a subwoofer output for the integration of a 2.1 audio system. In addition, the BL20C offers a tone control on the front panel, with the ability to adjust the level of bass and treble.