Yeah the S4X look great. I’ve never heard any of the other headphones on your list aside from the HD-25 so I can’t offer an opinion on how they stack up. With regards to open vs closed, the Ollo S4 is open, and as far as I can tell the design is almost identical to the closed version (S4R), with the sole difference that the closed version uses a solid (rather than perforated) plate on the ear cup. They don’t block out outside noise much at all, so there isn’t much of a ‘seal’ so to speak. This is normal for open backed headphones.
I actually modified my old S4 headphones recently so I can swap between open and closed configurations whenever I want. I designed and 3d printed some magnetic parts so I can switch the panels out. They sound better than expected tbh; no real discernable difference when open, a bit more low end when closed, along with better isolation, but less soundstage. If you do go the Ollo route and fancy a set of these cups, drop me a message.
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