I’ll try to describe my experiences with my first Arylic product.
After the failure of the old Panasonic CT RX800 all that’s left of my audio was 2 speakers. I didn’t want to throw them away so i started looking how use them as an element for a DYI radio with alarm clock. When I discovered the concept of multiroom I wanted something that would allow me to play music from anywhere in the apartment. This is how I found Arylic products.
For my needs, I chose Up2stream Amp V4 together with an IR remote. There was also a simple paper instruction in the plastic box.
Connecting the 15W 2.7Ω speakers was trouble-free. I bought a 12V 8A power supply - just in case if I would use larger columns in the future. It’s nice that the set included a suitable screwdriver, which was useful for the terminals in the phoenix connector. A quick test of the application, channel switching and it turned out that I didn’t change the jumpers on the board - from mono to stereo 
I corrected my error and was finally able to control the device using the IR remote and the application.
I use the 4Stream app for Android and pairing with my home WiFi network was very easy.
I connected a HDD in USB casing filled with my music collection to my Fritz router. The router detected it right away and made it available in its MediaServer. I indexed the files there and checked it on the phone - it is visible. Then I set the application interface to my native language.
Features tested so far:
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Local Music Server- works very well, allows you to create your own lists of favorite songs and assign such a list to one of the 6 numeric buttons on the remote control.
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Radio: The internet radio feature is amazing for me. After years of using regular FM with noise and range problems, it’s something very pleasant. I assigned some of the best stations on the remote control buttons. Sometimes I look for something new in 4Stream - just for a while.
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Remote control: range of several meters, provided that it can see the LED on the board. Each time you increase / decrease the volume or change some settings, a short beep sounds. I got used to it.
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Alarm clock - works only when the device is turned on - it will not turn on by itself at the time set on the phone, but this is not a problem for me. Waking up to your favorite movie track makes up for everything.
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Bluetooth - works OK, I haven’t tested this feature for a long time
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USB - I tested with a USB stick, where there are only a few songs - it worked OK.
Now some issues: 4 times in about 40 days I had to restart the device by unplugging it from the power supply, because the 4Stream application lost / could not detect the connection with the board that had been playing for several hours. Oddly enough, the board responded to all IR remote commands, changed radio stations, etc., the application on the phone had a problem with detection.
Overall, I am satisfied, the expansion with new devices should be simple and the system will be many times cheaper than other solutions. If you plan to place the plate in a visible place (so that the IR LED is visible), I recommend buying a remote control as an additional accessory.
What’s left? I want to make a wooden case for the Arylic board, change the speaker wires.
Keep in mind that I still have a lot of work to do. I have audio for one of the three rooms. I’m a complete newbie in the subject of audio, so before that I’m gonna read about DIY projects that I hope to recreate at home. I will try to find the optimal connection of the loudspeakers with the TV and another Arylic board (maybe with optical input), so that I can watch movies with better audio or enjoy music in a multiroom system.