Review on Bluetooth 5.0 Stereo Audio Amplifier with 192KHz DAC: Digital to Analog Audio Converter for Home Passive Speakers - Optical/Coaxial/AUX Input, 2 Channel Class D Mini Hi-Fi Integrated Amp, 60W Immersive Sound Experience by Luke Liu

I ordered this 30w + 30w stereo amp to use with a good pair of spare passive speakers. [Note: This high power Class D amplifier requires passive (i.e. unamplified) speakers to function properly.] I was surprised by the physically small size (separate power supply) and used banana plugs to connect the speakers. The amplifier has coaxial and optical digital connections as well as additional analogue connections (cinch plugs); I am using an amp with FAT32 formatted TF cards in a USB adapter and with my bluetooth mp3 player. [I record artist marathons in MP3 format (entire catalogue) onto 32GB TF cards for use in portable electronics, but here I'm using TF cards in a USB adapter.] Setup was easy: make sure that the power switch was off and the volume knob was set to minimum. I connected the passive speakers with cables with banana plugs. I tightened the bluetooth antenna connections and then plugged the power supply into the amp first and then into the outlet (the indicator light is on). I plugged a TF card into the front USB jack with a USB adapter, then turned on the amp and turned up the volume: the speakers' fidelity dwarfed the amp's fidelity, but I got surround sound with the amp volume control set to 9 o'clock. (i.e. lots of energy). I turned off the amp, took out the USB adapter/TF card, then turned on the amp and put it in Bluetooth mode. My MP3 player found the amp with no problem, and the music continued at room-filling volume. After listening to a few songs, there was no heating: I'm not worried about overheating and burning out of this physically small amp.