i got it,
but it should only alter sound frequencies not volume,
if it makes enough changes that it creates volume imbalance it is 100% defected.
and why any fabric material/pads can create volume imbalance is beyond me (i'm skeptical),
but it sounds like terrible quality control.
Note that my first K702.65 is like 3db off and no way altered frequencies can create this kind of imbalance.
I was never saying this is what was causing your issue that you had. . .was just point out that variances in manufacturing can create these issues, and that they are not limited only to variations in the drivers. Everything that is over your ear can alter/tweak the sound from a headphone. . .whether it be from resonances, reflections, dampening, etc. . .I was simply sharing my personal experience as an specific example of this in general. Oh, and yes, it was enough to create a perceived imbalance. . .not sure if I can stress that word enough. Technically, however, I suppose if you were to break it down into various frequency ranges, such as that of an EQ, it was in fact creating an imbalance. It was something around 1 db (my estimate) of the overall perceived imbalance though. . .so obviously it was easily noticeable.
And why is a variation in fabric density creating a difference in sound hard to imagine?