To each his own but check the waterfall and impedance graphs. There's a measurement section on that site with more info. Also, those are differenct tips. Here's the Ortofon with the same stock tip as the Grado.
Similar, yes, as I'd expect from similar motors but not identical. Other than case volume which isn't that different, there is no tuning. Same tips, nozzle and filter and that difference in enclosure volume won't have that large an effect on impedance at 1khz. There's no additional parts involved. Generally that measurement doesn't vary from test to test as some other may. Even in those graphs, the ones you're using to show sameness, there's 4db more bass in the Grado. That would be impossible for the same driver in what is probably a slightly smaller encloser. Lets just say we'll agree to disagree.
Here's my take on the Grado/Ortofon MA thing. I am 99% certain the GR8 and EQ-7 share the same exact driver. Their frequency responses are almost identical and so are the impedance/electrical phase measurements (based on Sonove's graphs/Headroom). The GR8 looks exactly like the Yashima N20 which never reached mass production. I think Grado simply bought off Yashima's use of their designs, while Ortofon simply has the right to the driver. Compared to the GR8, the EQ7 seems more refined and controlled with an identical response, more finely tuned. After that first driver I think Yashima refined the same driver and used better material, guess technically not the same driver. Thus the GR10 gets introduced which I'm almost sure was all designed by Yashima sine it was the case before, whereas the EQ-5 is Ortofon's take. I'm not a fan of the GoldenEars graphs (though still interesting) as I don't know much of their methods but the Headroom graph comparing the GR8/GR10 is spot-on in how I hear the differences between the EQ5/EQ7. What I'm wondering is if there's going to be a difference like the GR8/EQ7 between the newer two. Haven't heard the Grados, but I have to give much more respect to Ortofon for personalizing their product. Grado seems to be simply making use of their brand-name, overpricing the product and claiming credits. I can see such approach since they have actually punished/critized reviewers for posting unbiased negative reviews of their products.
For personal benefits, what you hear is best. Graphs are great if used in relation to other products if you know what to look for and understand their nature/procedure. For personal decision making, I'll take a graph I understand well over a user review as it's not glossed off by bias, placebo and related variables (which are always overlooked). Still, user reviews are great in understanding the whole holistic nature of the IEM outside of sound and certain variables that occur between users. I will take my personal listening over both though, obviously the same for everyone else.
Nice completion by the way, surely looks like you're into it. I will also like to thank you for the appreciation on Joker's thread.
Edited by Inks - 11/13/11 at 11:37pm