for the price, excelent device, connected to 6 ohm repro gives nice clean sound, enough basses. Great BT connection. After shutting it of on the device, it starts always in "line in/AUX" mode and full "digital" volume (independent/fine adjust adition for analog volume knob..). Inserting SD/USB triggers immediately play of particular source (remembers position). In my case, the quality of AUX IN 3,5jack is so to say questionable, but there are still Cinches and nice BT! Overall i am very happy :)
- 8 workingday after orderplacement i received this Amplifier From Czech Republic EU DHL shipping and i think it is fast - Nice sound if you use good speakers. - Blue tooth is working O.K. tested with a smartphone indentifies itself with BT in the smartphone - setupmenu - Aux is also working O.K. with / from a smartphone headphone jack 3.5mm (cable). - FM receiver O.K. scaning channels and working. - micro SD card in SD adapter(32 gb test) SWITCH over ONLY when you put it in the SD slot, you do NOT have to select the slot You have to put the SD cart UPSIDE DOWN in the slot. - USB (16 GB test) MP3 SWITCH over ONLY when you put it in the USB port, you do NOT have to select the USB port. I am Happy with this AK380 Amplifier