The amp HiFi Lepai is surprising by its small size (12x9x4 cm), its price (!!!) ... and by the quality of its sound. I immediately stored in the cellar my old amp Hi-Fi Yamaha. Two recommendations: a - I preferred an amp charger + solution proposed by this supplier to be certain that its power is well suited to the enormous power that this little amp can deliver b - I found that after a few weeks' amp fed only one speaker. I thought "failure" and I contacted Amazon via the "Chinese" provider immediately respond to me and helped me to diagnose the problem. In fact it was a bad contact problem of jack sound provider. I've realized that many of my devices had the same problem .... faulty jack or the sound does not go out on a single speaker. For completeness I use mainly the Lepai with a 7 "Android tablet that reads audio or video stored on my network, including a hard drive connected to the USB socket of the Freebox.