Hey, I’m well aware, that the question wether Burn-In for DAPs is real or not is heavily debated already. This post ain’t about that! It’s rather a scientific one: When I got my latest DAP (AK SR15) I couldn’t help but give it a go right out of the box. I was surprised to find spaciousness was a little bit short compared to my AK70 and heights seemed to be inelegant and sharp at times. I then connected Headphones and let it play for three days straight without ever listening to it. Afterwards I compared again and the soundstage seemed to have widened and treble definition was both smoother and more detailed as in my AK70. So: Call me a believer. Burn-In did something to the player. But call me also a physicist, wanting to know! What exactly happened there? I honestly have trouble thinking of something.