Observe that the above poster returned the amp since he heard audible sound. The A50+ takes advantage of a distinct TI amp chip (TPA3116) but I doubt which was the reason for the sound as the TPA3116 can measure extremely effectively. As noted I do not listen to audible https://israel8q7es.vblogetin.com/41895693/the-smart-trick-of-sculpture-that-nobody-is-discussing