KhAi-54When i purchased mine, i paired the m560 with my sony zx2 and the fiio e12 mont blanc portable amp. The first two minutes i was in awwww as to the clarity of these babies. At about the second minute, the right driver stopped working, i tried everything to get it to sound again, checking cables switching amps etc etc. Finally all of a sudden it begin to play again. It played for hours no issues, crystal clear. The next day i connect them again and the right cup is barely working for a few seconds then it comes on. As i continued to listen there were moments that the right side driver, i can hear a mishap in the sound, a very slight distortion which i knew was not normal, then all of a sudden disappeared and played super clear. I knew i had a problem. I reached out to monoprice via email because i simply wanted a replacement due to the fact that i probably had a bad set. However after three days of no response i simply returned them via amazon. These headphones are gorgeous and look and feel robust but they practically rested on top of my ears because the headband has no clamping force at all and the metal band appears to be to thin to wrap them tighter as to make them clamp so i left them alone. You just can't move around when listening or they will literally fall off. If monoprice makes the appropriate revisions i will repurchase as i loved the sound signature on them. Its mind boggling that i have read some reviews that state that they are just ok headphones....which suggests that they are a hit or miss out of the manufacture. So if you get a set you will loved them, also i did not need to break them in, they sounded great from the get go until they failed. Enjoy hope you get a great pair. P.s. I played AAC320kbps music ripped from cds and some flac. No streaming with me.