Really? I've heard the K712 is not on par with the MSR7 in terms of detail but still fairly good,but it's not as upper-mid and treble focused. I was considering the K612 as some said it has a bit more midrange and treble energy than the K712 as almost as good as the MSR7 in terms of detail.
I haven't heard the K712, but the K612 is pretty close to MSR7 in resolving power. MSR7 does have noticeably more resolution in the treble, while the treble on the K612 is more polite and easier to listen to. K712 is likely somewhat more resolving than the K612, but I doubt that it's a big difference. I would get the K612 as a nice upgrade over MSR7 for a more relaxed, more balanced, spacious and dynamic listening experience at home - K612 is also far more comfy to wear and much more suitable for use in hot weather than the MSR7. It's more tonally balanced than MSR7, has better dynamics and sense of space and actually costs ~$100 less too!
I also have HD600 and Fidelio X2 and I don't think that those are really much better than K612, if at all. Maybe in some ways, but mostly just different and K612 actually beats the other two in some aspects as well, such as tonal balance and instrument separation for example. I do think HD600 scales higher than K612 with better sources. For it's current price, the K612 is a way better value than any of the others I mentioned, including MSR7. However, I would still consider an HD600, Hifiman HE-400S or Fidelio X2 if you want something warmer with more low midrange/upper bass body and a fuller sound. K612 is amazing for the price, but it's definitely more of a monitor headphone than an audiophile one, as it tends to sound drier, leaner and more strictly neutral than most audiophile cans, like HD600/650, Fidelio X1/X2 and even Beyer DT880. Personally, I love the character of the K612 and find it quite fun to listen to, but everyone is different so... just saying. Would be nicer if you could audition the other cans too to better establish your preferences.
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My MSR7 has crazy detailed sound in midrange and treble. The only other headphone I can think for the moment that can have similar detailed midrange and treble is the HD800. That right the MSR7 is that good. I would jump to the TOTL headphones from the MSR7. My Stax is another great headphone.
I totally agree. That's why I keep my MSR7, even though its forward, aggressive presentation is not really my cup of tea.
I should also add that I think the bass on MSR7 is also tighter than on any closed back and almost any other headphone I've heard, although the bass resolution is not quite as good as on HD800 or planars.
BTW, I find MSR7 very much an Etymotic ER4 of closed back full sized headphones. I think it's quite similar to the ER4 (more like an ER4P in the bass and mids and ER4S in the treble) in character and technicalities, but with more bass weight, which a great thing, as the Etys are really lacking in that regard. MSR7 is perhaps a bit more aggressive sounding than the Etys in the upper mids and highs, but that makes the MSR7 more exciting to listen to.