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I'm going to get vented headphones. KSC75 isn't durable enough where the clip snaps on. Mine are broken. They could vent through permeable pads (like velor). Sound will pass through the pads, so they won't block noise. I think they will be open back.
How I chose my current gear:
I bought the M50X because of good reviews and ratings. The excessive treble was irritating, so I switched to my ~$10 IEM. I searched for a negative M50X review and found Zeos (Z Reviews). He earned my trust by not liking the treble. Because of him, I gradually bought the KSC75, DAC-X6, and HD 280 PRO. I bought the HD 280 PRO because he liked the PNC and sound. I got much better PNC with KSC75 inside 3M Pro-Grade Earmuffs.