I haven't heard the Elex but heard the Elear (which was also touted as a super HD 650), sounded nothing like the HD 6xx series at all. I've only heard one headphone that gets close to the HD 6xx family sound signature that isn't a Sennheiser and that's the R70x, they're some differences of course but it's the closest thing I've heard in terms of tonality and timbre.I find the elex quite different to the whole 6 series.
I understand that someone that loves the 6 series signature cannot be offended by the tonality of the elex (because there is nothing to be offended) but i could not see the elex as a super 650 as advertised from drop even from miles away.
For me timbre and tonality goes in favour of the 6 series dynamics to the elex. Elex have a wow factor that after sometime it diminishes itself the 6 series is the beloved darling which always return to.
The HD 6xx series has the edge in terms of midrange nuance and vocal detail whereas the R70x imho has an even more neutral response, better perceived bass extension (excluding the 660S2), and much better imaging. Not sure on how I perceive their scaling compared to the HD 6xx series as I haven't heard them on a truly high end system. I don't think I like them as much as my HD 660S2, but I do like them more than my HD 660S and HD 650. Don't currently own a HD 600.
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