Sennheiser HD 620S

The airy soundstage on these is genuinely surprising for a closed-back design—I kept checking if I'd left my open pair on by accident. Detail retrieval is fantastic too, every little texture in the mix comes through without any of that boxy resonance I was used to.

Finally, a closed-back pair that doesn't squash the soundstage—the airy imaging really lets me pick out individual instruments in busy tracks. I've been using them for late-night listening sessions without disturbing anyone, and the isolation is excellent.

I was skeptical about closed-back headphones sounding airy, but the HD 620S really delivers that open, natural feel without any outside noise leaking in. The detail on acoustic tracks is surprisingly crisp, making long listening sessions effortless.