Amazon.com: S.M.S.L AD18 HiFi Audio Stereo Amplifier with …

AD 18 is a small full digital class d bluetooth amplifier built-in headphone amplifier supports subwoofer output.Connect it to your computer and use it to drive your headphones with an amplifier or to power your passive speakers(4ohm speaker produces 80Wx2 output power).Sophisticated matting aluminum housing reduces interference.

https://www.amazon.com/S-M-S-L-AD18-Amplifier-Bluetooth-Subwoofer/dp/B071JN7GXN