Be aware that the above mentioned poster returned the amp because he listened to audible noise. The A50+ works by using a special TI amp chip (TPA3116) but I doubt which was the reason for the sound because the TPA3116 can evaluate incredibly very well. As noted I do https://freelancephotographer28494.sharebyblog.com/35882571/the-smart-trick-of-marble-engraving-that-no-one-is-discussing