I have listened to many earphones, over the ear "cans", including Bose Noise Cancelling, and nothing, I mean nothing compares to this experience in good listening. I was happy with them when I first received them, but then I started to look up the interchangeable sleeves, and was curious as to what were the differences. The ones that come with the earphones are a neutral, yet tremendous sounding sleeve, but then I curiously looked at the black sleeves, which were labelled "warm". I took about 20 minutes to figure out the way to change them (took my...