Hi there.
Well I have auditioned both, the open and the closed versions, multiple times, without an amp, just listening to Google Play Music purchased songs using a Galaxy S4 smartphone.
To my surprise I prefer the closed version. I felt that the closed version had a more coherent edge on this new sound that Audeze has issued.
IMO the sound signature takes some getting used to, and is much brighter than products in the Audeze LCD line, but, there is a lot to like as well in the tuning and sound signature.
Good separation, nice soundstage, good imaging and tight controlled planar bass that has some rumble and texture to it.
IMO, nearly all of these above mentioned elements of the sound of the closed version are less apparent and more diffused in the open-back EL-8. Except for soundstage and air between instruments may be a bit better in the open version, at the cost of some of the potency and musicality of the EL-8 sound signature that is found on the closed version.
The EL-8 is very easy to drive from any DAP, but I would like to see how it performs with my new portable amp the Sony PHA-1A.
As far as build quality goes, it's amazing. I'm not yet sure of the materials used but much of the EL-8 structure feels ultra premium with metal that feels as strong as titanium. The build quality is as impressive or more-so than any other headphone I can remember.
Although the wood veneer doesn't look very good IMO.
A better looking wood could have been used but no wood at all, if it is actually wood, may have been better.
The earcups are huge but also very comfortable, with no sense of excessive clamping pressure and the weight of the headphone, which feels quite a bit lighter than the LCD series, is not distracting IMO.
Anyway, these have been my impressions so far. I'm looking forward to auditioning the EL-8 headphones again with a portable amp to see what, if anything, it will do to improve or enhance the sound, which so far to me is very nice and quite impressive in certain aspects but so far not nearly as engaging as products in the Grado line up, SR325e for instance, some of which cost considerably less than the EL-8.
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