Huh. Interesting. I have both headphones. I suppose your MSR7 is stock, right? If so, it's held back and really doesn't stand a chance compared to the 58x in many areas. For all their great features, even at stock, the MSR7 kind of kill the enjoyment because of their harsh treble and upper midrange where there's some sibilance, while their bass quantity leaves a bit to be desired. Don't get me wrong, I loved them before I modded them and now they're probably my favorite headphone, but the 58x has nothing to be ashamed about compared to anything. It's not a great headphone for the price. It's a great headphone, period. Are there better ones out there? Sure. But there's always something better out there, no matter what you have.
I'll try to make a comparison from memory against the stock MSR7. The 58x straight up has more bass. The MSR7 sound anaemic by comparison, 58x wins hands down. The 58x also win comfort, but the MSR7 is built with nicer materials, though none of them is either uncomfortable nor gives the impression it can't take a beating. Mids... It's a wash. The MSR7 has REALLY nice mids, but the 58x is at least as good. Female vocals go to the MSR7, male vocals go to the 58x. Instruments sound equally great on both, depends on the song though, they're quite different. The 58x is more mellow, relaxed, while the MRS7 is JUST PUSHING SOUND AT YOU AND YOU CAN'T IGNORE IT. Which brings me nicely to where the biggest difference is. The treble. I find the treble on the 58x to be just shy of juuuuust right. I'd need a little more extension, details and smoothness in the treble and it'd be basically perfect. The MSR7 on the other hand... It's treble, treble, treble. You want detail? GET ALL THE GOD DAMN DETAIL IN THE WORLD. But if you want to put them on and relax? Too bad mate, YOU'RE GONNA LISTEN TO THIS NOW. The detail retrieval is absolutely insane with the right setup on these things (they're quite amp picky for how efficient they are). But there's a problem with harshness and sibilance on the stock MSR7 and anything longer than an hour of listening actually hurt, especially before break in. Lastly, soundstage and imaging... It's honestly a tie. Imaging is damn near perfect on both and soundstage is a bit wider on the MSR7, a bit more natural on the 58x, but it's really minute differences here.
The story changes a lot if you decide to mess with the MSR7, but that's a whole other story that I'm not going to get into here.
With all that said, the 58x complements the MSR7 perfectly. You get a more comfortable, relaxed, open, warmer headphone. If you want more detail or more sparkle in the highs, or care to take them portable, you have the MSR7. You're probably gonna love the 58x, I know I do.
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