Bought these off local CL for delivery to @Gazny : HD600 black screen. The headphone/packaging looks to have been very well kept and just about new but I can't believe pads are original because they are clean and well-formed. VS my modded HD6XX which I recently sold to @dematted so can't compare directly: HD600 sounds more intimate, bit shouty, less murk, less warm, tighter bass. I think Gaz intends to mod. HD600 (mystery condition) and my 6XX's off-KISS mods (+ aftermarket pads) and variables in measuring and weak memory make this not so useful data / fwiw / just fun. Practicing measurements of 6XX mods over time maybe has started some consistent habit in placement. Edit: I wouldnt be surprised if same aftermarket pads were sourced. Its like the first hit off Amazon and is cheap. Edit2: Pads. Mehsurements down this page (sorry on mobile so cant link specific post). Edit3: There: Edit4: My comment about 600 sounding more “intimate” vs 6XX is a soundstage descriptor. I forgot that my 6XX used a HD580 headband which is larger so light clamp. So, I think the 600 stronger clamp explains soundstage difference by having driver possibly pushed up closer to ear which is preferable. 600 clamp didnt offend me as much as 6XX stock headband clamp comfort wise. Maybe 600 was originally as bad and got stretched out, and/or the 600 possibly had those softer aftermarket pads that allowed a bit more clearance. I didnt try 6XX stock headband with aftermarket pads.