I was able to test the speakers before buying extensively, with an iPhone 6 and an LG smartphone unfortunately videos with the Denon are not quite lip-sync, with a headphone (with cable) but already. Who just listening to music and no music videos look, the will not care. For me this is a reason not to buy the Denon. Therefore 2 star deduction. 1 star less there is for the inconvenient control buttons on the side and for the lack of power supply for the USB cable. The sound is very good, the strong bass can slow down somewhat by a soft surface.
