Koss Porta Pro "Beached Whale" Mod (desc. in comments) : r/headphones
Amazon.com: Massdrop x Koss Porta Pro X On-Ear Headphones — Noise-Cancelling in-line Microphone, Activate Voice Assistant or Skip Tracks with in-line Remote, Collapsible for Maximum Portability (Midnight Blue) : Electronics
Koss Porta Pro (Kramer mod & Yaxi Pads) even they are not the best sounding pair of headphones in my collection, at the moment they are by far my favorite one. Next "
Taking Koss Portapro to the Limit (cool mods). | Page 9 | Headphone Reviews and Discussion - Head-Fi.org
I'm back! Plus Koss Porta Pro... | Super Best Audio Friends