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My thoughts on different generations of RS1s:
First: super vintage and vintage A (the ones with wooden boxes)...............second last: RS1i, Last: any other RS1.
The gold 325 I was thinking of were the limited edition ones (not the black 325 with gold lettering and HP1000 drivers).
My favourite 325 is the black one with the John Grado drivers -come to think of it, they are the only SR325 I like. I prefer them to the ones with HP1000 drivers.
All subjective opinions of mine of course.
I owned a John Grado black SR325 and sold it for a smaller sum of money to Nerox. I didn't know what to think about its sound. It had the most bass of all the nine Grados I owned, but I didn't like it much nonetheless. Just like you said: "tous les gouts sont dans la nature" (all tastes are parts of the nature). I love my SR325-0 and SR100-0 just as much as my HP1 and -2, I think the difference in sound is really minor and not a strictly negative one.
I don't know why I love the HP-1000 drivers so much more than those of John Grado. I think they both have a lot in common, maybe it's due to their geometry and openness, but when I think of the Grado sound I think of an approximate mix of all my Grados, including the vintages and the HP 1000 that forged it. Basically all Grado owe their shape and size to the HP 1000 (GS- and PS-1000 not so much though!), and their sound to all of the John Grado headphones that preceded them.
I've taken out my RS1 of its comfy box, boy those taped bowls I'm trying make miracles (on all Grados). It solved the harshness and many other gripes I initially had with their sound.
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Putting a driver into a plastic sleeve and into an aluminum cup doesn't do wonders for the sound.
No, but they does a fine job holding the drivers above ground
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I definitely think Grado has different driver classes, maybe one for each series, and then grades, to share between the different models in the same series. But I see it more like a continuum to cut in equal halves to delimit ranges that make a pair of drivers fall into either the RS1 or RS2 category (for example), than same sounding, punctual, equidistant and equal grades, which would explain why different SR125i's or PS500s sound different (i.e. the general variability in sound Grado is known for), or why some SR125i sounds almost identical to a SR225i above, or a SR80i under.
Like I said to pcf, I have four HP 1000 variations, and to me they all sound "grossly" the same. One is housed in a narrow plastic enclosure, the other in the longer tubed, original SR325 metal hybrid enclosure, and finally, two of them in a full metal slim RS-1 like enclosure. I can barely differentiate HP and SR another (when listening).
Based off that, I think improvements from the SR60i to the RS1 in sound quality of the Grados are in most part due to the quality of the drivers, and not so much material and geometry of the cups.