Review on Mini Dual Channel Mixer Sound Stereo Receiver Box - 2X40W Home Audio Power Amplifier System with RCA, USB, AUX, Headphone, Mic Input, LED - Ideal for PA, Theater, Home Entertainment, and Studio Use - Pyle PTAU23 by Kristen Stewart

Overall, I really like the device. However, right from the start I realized that there was something very subtle wrong with my device. It worked pretty well out of the box, but it just "stopped" shortly after. I disabled everything to test the device. I accidentally turned it upside down and heard something dangling and rattling inside. I turned the device right side up and for some reason smacked the top with my palm - it started working! By the way, that happened twice. Since then it has been running fairly reliably. I can only assume that something wasn't fully attached during the production process. As long as I don't move it (it's now on a wall-mounted custom shelf, so doesn't move at all) it seems to be working quite happily. By the way, I admire the number of users. -Managed device capabilities. They are very comfortable.