My HD650 are the newer silver driversDo you know which version your hd650 is? If I'm not mistaken they revised their drivers for their late 2010s. Not sure which one newer but I read something about silver drivers on hd650. I'm not really into sennheiser products.so please correct me if I'm wrong
@joseph69, I'm not the only one that noticed that the HD6XX sounded different as there was another on the HD650 thread said his HD6XX did sound a little brighter also. I was hoping they sounded the same since I was going to mod the HD6XX with some of the non-reversible mods but since I like them better than my original HD650 I'm not going to touch them at this time.