Take note that the above poster returned the amp simply because he read audible sounds. The A50+ employs a special TI amp chip (TPA3116) but I doubt that was the reason for the sound because the TPA3116 can measure incredibly effectively. As noted I tend not to listen to https://charlieb11o6.blogpixi.com/36312115/helping-the-others-realize-the-advantages-of-wood-engraving