Rig
EAC->Flac->Foobar2000->WASAPI (Vista SP2)->SB Xtreme Gamer->True Colours Industries Coral->Beresford TC-7510 (Mods 21 & 21 pt2)->Lindy Audio Premium Gold->DIY GS Novo.
Review
Listening to Money, by Pink Floyd, the RS1s provide an increased separation of the instruments over the SR80s. The highs are much clearer without being harsh....Gilmour's guitar work being particularly improved. The soundstage is wider than the SR80s.
Listening to Angel, by Massive Attack, the RS1s handle the driving bass in the opening section with more poise and control than the SR80s and there's more of it. The repeated click (drumstick against rim?) is crisp and clear.
I was going to continue in this vein for a few more tracks, to illustrate my points, but decided to cut it short. Why? Well, I've done a fair bit of "critical" listening with these phones now and felt they were a significant improvement over the SR80s. However, doing direct comparisons on short sections of a track proved that the differences are not as great as I thought.
It's true to say that the RS1s may not be fully run in yet. The seller reckons he had about 30 hours on them. My SR80s took much more than that to fully settle down (200hrs?).
So, what's the bottom line (to date)? The RS1s are about £650 new (Audio Affair), with the RS80s coming in at around £100. That's 6.5 times more than for the RS1s....and they aren't 6.5 times better sounding so, personally, I wouldn't buy them new.
So what do you do if you want new (rather than secondhand). The RS1s are supposedly built using the same design as the SR325s but using different materials. So, if new were the only option, I'd try out a pair of these.
I think this experience has underlined for me the fantasic value of the SR80s. Yes, the RS1s are an improvement but its not the night and day difference I was expecting.