I finally listened to my newly acquired RS-1 last night. The music that was involded were two of my all time favorite albums: Pink Floyd Meddle and (MSFL) RUSH Signals.
The first thing I noticed, tonally the RS-1 are very very different from the DT-880 '03. The RS-1 presents a very forward mids. So much I had to turn down the volume as I found it too agressive. After a few minutes, my ears slowly get accustomed and I was able to boost the volume but not very much. This was no surprise to me, RS-1 forward midrange is well discussed on the forums.
The second thing I noticed is the narrower soundstage. It's narrower from left to right, no doubt about that, but I think the RS-1 offer more depth or it's just more easy to notice. Still, the instruments are very easy to place and are focused. Going from the DT-880 to RS-1 made me the impression I was going from planar speaker (with big, large and airy soundstage) to good bookshelf monitors (small but precise soundstage). Again I was not surprised, this a known Grado sound tradeoff.
But I was surprised by this: I found the the bass of my RS-1 dry and thin. Nowhere as extended as the DT-880 and no punch either. But it's a lot more articulate, it was very easy to distinguish every notes from Geddy's bass. This is certainly a little deception for me I was expecting something more weighty than my DT-880. I wish it's a burnin problem. The previous owner put about 50 hours on them. This is also the newer "buttonless" version, some said they are drier than older RS-1 with buttons.
But there's one thing I like a lot more on the RS-1, it's their treble: extended, smooth and finely grained. Cymbals just sound more natural and metallic than the DT-880. Very sublime.
The RS-1 are fast on their feet. I had the impression the music was played on a slightly faster tempo. They offer a very rythmic and musical presentation something like an all Naim audio system (if you have already hearded a complete Naim rig you'll understand what I mean).
That's all for today, I hope my english wasn't too bad.