Question that I have not seen addressed here in the 1400 or so pages of this thread: Do particular models all require the exact same damping? For example, I have two sets of YH1 headphones. If I damp both exactly in the same manner, are the drivers manufactured with tight enough tolerances as to require the same damping scheme to sound exactly the same?
Another way of saying it: From the factory, assuming no degradation over time, is there a variance in sound from one set of headphones to another (same model)? If so, then different damping schemes might make sense from can to can.
I have thought a lot about this over the past year. For every set of ears, there is a preferred damping scheme. This is a personal preference based on our listening experiences, associated gear, etc. But could it also be due to variances in drivers from headphone to headphone?
Happy New Year.
Aside from driver variances and who knows what kind of variance manufacturers back then had (look at the Russian models or even Yamaha's own HP-3/HP-50), other conditions like the mesh filter/cover and earpad conditions will also change the sound a bit.
As for two YH-1, there's also the oddity of the drivers themselves. My YH-1 drivers have nothing over the ferrite magnets, while leeperry shows his to have what seems like metal plates over on each end, much like what I think is the aniso HP-1 I have (whether it really is aniso or not, this one is my fav in terms of sound). I don't even know if YH-1 exists in the sintered and anisotropic versions like the HP-1 but at least my YH-1, which was opened for the first time last month, looked exactly like a larger HP/YH-2 driver.
I recently switched the entire baffle of my YH-1 (pads in almost pristine condition) with that of my HP-1 (almost flattened) and sadly the sound changed a bit. Will probably be switching the baffles over again, if I don't feel too lazy about un-sealing and re-sealing the drivers to the baffle.
In any case, preferences will play a huge role in damping.