Review on 🔊 Arylic WiFi & Bluetooth 5.0 Home Audio Amplifier - Up2stream Amp V4: 50+50W 21V DC/2.0 Stereo Channel & Mono, Multizone Streaming Board with Airplay, Spotify Connect for DIY Speakers by Ben Demers

I got this along with a few other parts to make my own portable bluetooth speaker (yes it's done, working and I'm proud of the results). and it's very generous in terms of power consumption. has many audio input options. but i only have a few complaints. First, understand that you can't change the input without using the remote control app that you can get from the company's website. and even then, replacement is troublesome. For example, if I connected it to Bluetooth but wanted to use AUX, it would disable Bluetooth and then switch to Aux. And then I have to open the app again to turn Bluetooth back on. (If you only use one input mode, this is not a problem) and one more problem. Volume, each input mode has its own individual volume setting. so i keep the volume on max amp and adjust the volume on my phone. but whenever I turn on the speaker. I'm greeted with a deafening beep indicating Bluetooth is on. and the only way to fix this is to go into the app and turn the volume down before turning off the device or switching to a different input. and then turn it back on after turning it on or switching back to Bluetooth. (Again, no problem if you only need one input method. But that's not the point of this amp. It's designed to be flexible depending on how you use it. Like the Swiss Army knife of amps. That's a rusty one too hinge has... changing blades is a headache but once you have the right blade it works like a charm)