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?
I think you misunderstand my point here,
what you say about "everything between the driver and our ears" can alter the sound is 100% true.
and i never say variation in fabric cannot create different sound.
The only reason i brought up my defected pair as an example is because the imlalance was too serious at the point that it is the drivers that is doing it.
-Left and Right channel don't reproduce exactly the same frequency responds.
-People want their headphones to be balanced.
-fabric alters the sound
-different sound frequencies responds can make human ear "perceived" as having different volume levels
and all I was trying to say is:
-different frequencies responds will never cause too much channel imbalance to the point that its 200% noticeable.
so basically I agree with what you said, and you misunderstand my point