Well just let me say, I bought a pair of 650's from amazon Christmas 2012, used them up until May of this year, when amazon had a one hour sale, for $230 for the 650's so I bought a second pair, did not want to be without the sound. First pair came in a silver box, same silver-white drivers. second one came in the black box, same silver-white drivers with new hologram. Initially the BLACK box pair sounded different I thought I detected subtle nuances on the new pair and I really liked them better. That being said, I have now put on several hundred hours on the new pair, and figured why not try the OLD pair just for the heck of it before I sell them. Unboxed them put them on and listened for a couple hours. Funny, I think I heard a subtle nuance on the older pair that was not there on the NEW pair, oh what to do now. Perhaps I will put the old pair in the BLACK box for awhile and see if maybe the color of the box changes things. NOTHING has been changed on the headphone except for the hologram on one of the drivers and the new BLACK box. Fact is maybe when I put up the older pair for sale I will include the new BLACK box so that the new owner will feel the nuances as well. As far as buying and returning headphones over and over again looking for a different outcome, probably not the headphones but expectations or gear in use.