the transitioned time probably really hard to trace because as you know grado never actually tell when they deploy it,they just label it as it is.but the second generation.the i.that's quite different matter because the chasis/headphone cup actually changed.from non i to i version.from flat to have mushroom shape. when grado released ps1000 i remembered they already discontinued the sr325i which if i'm not mistaken the sr325i was the gold version. i don't think there were any sr325 with gold cup. when they released the second generation.they put letter i on all their headphone.but the sr325 already have letter i(for the gold one).that's why they called their second generation of sr325 as sr325is and just rolled back the colour to silver.. in alessandro lines up of the ms2.just ms2,ms2i,ms2e.there is no ms2is. perhaps the weirdest part of sr325is is the colour scheme.i remember back then they have a few iteration of silver finishing because of the problematic of some finishing not always resulted a consistent finish
but i'm not really sure about this one though
@ joseph69:
this is probably difficult to find out. I bought my first Grado the SR80 (without i) in spring 2008. Than in summer I was in full grip of the grado fever and bought my golden SR325i. I had than never heard about the new series. Ok here in Europe we might be a bit behind in the model changes but still I would say this happened later. It must be somewhere here on the forum because I remember people posting pictures of the SR XXi models with the change plastic cups. At that time there was no official note from Grado....
Thank you both for your responses. @ruhenheiM you're correct about everything you mentioned above.
I contacted Grado, and they said the 325is came out about 12yrs ago which bring us to '05???