Originally Posted by music_4321
I know you're specifically asking about those 3 IEMs, but just as an FYI, the AKG K3003 (universal IEM), and according to several owners, including myself, sounds very, very close to the HD800 — the only trouble is it costs as much as the HD800 ($1,300 in the USA, £1,000 in the UK & 1,200€ in the rest of the UE).
The K3003 comes with 3 different filters — seems most of those who have found very close sonic similarities between the HD800 and the K3003 preferred the "reference" filter (the others are called "high boost" & "bass boost" filters. Most didn't care for the "bass" filter but some do prefer the "high boost" over the "reference" one). There are two models, the K3003i with a remote/mic unit (for i-devices) and the K3003 (no mic/remote). I prefer the latter but it's harder to source and you may need to contact AKG directly to get a pair unless you're based in Singapore (and possibly Hong Kong), where they stock both models.
Here's a K3003 thread with several reviews and impressions: http://www.head-fi.org/t/610145/akg-k3003-impressions-reviews-discussion
I've had a look at the K3003 to be honest... As I said, I discussed about this topic a lot and also seen reviews, saw innerfidelity's measurement for K3003.
I agree that K3003 with the reference filter should be close to HD800... That said, the price of these is definitely what keeps me away. I've paid around 1200USD for new HD800 and definitely not gonna spend more for IEMs until I realise that IEMs are the way to go for me over full-size headphones. Another thing that is not convincing is the actual measurement of K3003 on innerfidelity - for the price, it's actually quite disappointing.
(not to say that EX1000 measure ideally but these can be had for 4x less, of course...)
To sum up:
RE272 - should be a pretty balanced IEM with neutrality, imaging, separation, soundstage, even comfort... just a pretty good IEM with literally no flaw
EX1000 - extreme soundstage with reasonably neutral signature, some manufacturing variance occurs (treble response differ with different pairs) and that's quite difficult to get over
SM64 - should have a bit forward mids (maybe singificantly?) with quality bass and treble, in general near to EX1000 in terms of overall sound signature.. soundstage should be great... but how great in comparison to EX1000? And are these really close-to-neutral, or rather coloured?
Edited by RustA - 4/23/13 at 11:49am