A local sennheiser dealer was telling me that his rep says that fake Senns are a rampant problem. Were they purchased from a reputable authorized dealer? Regarding Senns, I wouldn't buy them any other way, having heard this claim of the prevalence of fake Senns many times now from independent, reasonably reliable sources. I guess it wouldn't be all that surprising.
No. These headphones are purchased from authorised Chinese dealers who obtained them from the Chinese distributor. Source is reliable.
Further survey shows that all the HD650s produced in 2007 are like those in the top picture, having HD580 mark on their drivers. Anyone who recently purchased HD650s please take off the pads and verify that the drivers have "HD580".
I have HD650 in front of me now as well HD580 on my head (listening to music) First of all, they DON'T sound the same or even similar thus, they do NOT share the same drivers. There is NO marking on my HD650 drivers but there seems to be date stamped on the HD580 drivers. I have a dark silk baffle screen on my HD650 and white baffle screen on my HD580. I have owned 2 pairs of HD650 in the past and they all sounded same as the one I own now.
To OP, can you return yours for a "more genuine" HD650? If your source is legit, they should have no problem with exchange.