I'd like to start by stating that I do respect the people and the opinions of those who disagree with my assertions. That said, it is my understanding that the SR series drivers are indeed the same, with the housing/cups materials, number of holes vented in the felt, cables and cushions being the differences between the SR models. These findings are the product of "Bilavideos" work and in turn the basis for this very thread. It was Bills report of these findings that first interested me in this subject and ultimately motivated me to experiment with SR modding myself. The SR series drivers baskets, magnets, voice coil impedance and resistance measurements, mass, build materials, and diagrams are all identical. If this is news to any of you, then perhaps a re-read of this thread is in order.
Have these variables been measured by anyone so far? I have followed the entire thread from beginning to end and while remembering Bila mentioning that they were identical, AFAIK no one has done conclusive tests with weighing scales/multimeters to prove your above statement. Do correct me if I'm wrong. Also, if Grado were to change the drivers in their earlier SR series (read: SR200) as well as in their RS/HF/GS/PS series (schwallman's comparison between his RS1s and HF2s) wouldn't it stand to reason that they could have put their SR series drivers through similar modifications as the headphones progress down the line?
Just a random postulation. I was under the impression perhaps the mylar coating on the drivers could have been modified or changed down the driver line (has anyone had an experience with the symphones' drivers which apparently have been modified with a different coating to see if there really is a difference?)
EDIT: At the same time I do believe that the SR60 driver isn't as far away from the GS/PS/RS series drivers as price would have us believe, which is why I am pretty satisfied with my woodied SR60s and do not intend to go any further in the forseeable future.
Edited by Nightslayer - 5/5/11 at 6:53am