QUOTE(quick01 @ Jul 2 2007, 14:42)

Excellent, this is the kind of feedback I'm looking for! Good find! His feedback is spot on and I agree 100% with his accessment. The 580/600's are great even without an amp. But, when you add a good headphone amp, they become simply stunning using WMA Lossless.
Hmm...so the 420's will be available next week huh? Cool!

They're coming tomorrow via special delivery! Meanwhile, I sold the UM2s after deciding I didn't really like the sound. I didn't use them with an amp as I'm only interested in 'portable' listening so it might be worth asking other people what they thoughtof them amped.
I didn't like that I had to turn them up loud for the quality to come through, as it was lmuch ouder than I would normally listen to - plus at lower volumes they sounded really ordinary (like the E500s). So bedtime listening would have been a no-no with both of them as I don't want my ears assaulted when I'm trying to sleep and as I said, the quality dropped off as soon as the volume was lowered.
Now, please forgive my non-audiophile lingo

but here's what I 'heard'
Bass: I don't know what 'tight' or 'punchy' actually means - but the bass was good and I thought it was quite defined, ie., it didn't merge into one sound and become blurred. I liked the bass and didn't think it was overpowering, except with certain styles of music (more later)
Mids: Is this where most vocals and instruments are placed? If so, I wasn't keen on the vocals presentation. It felt very congested, a bit like the E4, vocals were playing in my brain with no space at all. I find that quite off-putting.
Treble: OK, I know what treble is, and I really sensed a lack of detail here, with cymbals etc hardly meriting a whisper. On 'Only Living Boy in New York - there are cymbals crashing throughout most of the song (in my right ear). With the UM2s, even after much EQing, I could not make out the cymbals at all, they were very faint, like someone clearing their throat in the distance??
I was expecting a much bigger soundstage so I found that disappointing as having to turn the volume up loud for them to shine, meant the 'in-my-head' feeling was extremely intense and I didn't like it.
My music is split - about 60% acoustic, classical, flamenco etc - and the rest is rock. The UM2's were very good with rock, but I could not bear to hear softer styles of music with them, as the bass tended to come across too prominently and seemed to upset the balance of more delicate sounds.
Finally, on a surprise note - I borrowed my friend's SE210 expecting to laugh her out of the house - and found they had the most enjoybale presentation I'd heard in combination with my NW-A808 (which is a very analytical player that desperately needs warming up for my ears to be able to tolerate it).
The vocals were the best thing - imagine standing at the front of the stage with the singer a few feet higher than you - the effect is very natural and realistic. The clarity was much better than the UM2s, the soundstage was bigger and I actually preferred them to the much more expensive E500s because they don't sound as cold. Soundstage is bigger than the E4 too, and without the brightness that used to cause my ears to ring!
Again, in non-audiophilic (is that a word??) language, the E500s produced a sound that was too separated for me - bass, mids and treble were so isolated from each other that I felt no sense of 'blending' (yes, that's my new non-audiophilic word thank you very much

) The SE210s were not much good with rock, but really quite acceptable with all other styles, so I'm assuming the SE420 will be better overall.
We'll see, as I never expected to prefer a single driver headphone to dual and triple drivers. Maybe it's to do with matching a particular headphone to the player that's being used - but if I could only pick one out of the UM2, E500, E4 and SE210, it would be the SE210, simply because the vocal presentation was so lovely. Closer than the E500s which made it feel more intimate, but not "in-the-head" as the sound comes from slightly higher up which really makes a difference.
Unfortunately, they're really fiddly to get a good fit. I had to keep pushing them in at an angle as without that - the sound was really tinny and echoey. Maybe the SE420's will fit better. So I'll let you tomorrow what I think of the SE420 - for the extortionate price they're charging, (about the same as the E500) - I expect them to be excellent!