Yeah that's nonsense. That's nice to know how sleezy the audio industry is, to consider such minuscule changes as new drivers. Those I would think for anyone else in any other industry, false advertising. It's slight adjustments. If I were to buy a new Camry, identical, except one has 16" rims rather than 17", but was told it was a totally new different car? C'mon, that's just dumb.
I would compare changes in an driver to changes to the engine. Could be the same engine block but various things may be different. If I were to compare a headphone driver to anything in a car, it would be the engine. The housing of a headphone is akin to a car body/frame, the pads could be considered the tires/rims, wiring/cables the fuel system, etc.
A better analogy would be the HD 6XX family is the Camry, but each headphone is a different version of the Camry, each has a different engine(or a tweaked version of the same engine) and a different trim.
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