Since they are porta pros they get all the benefits that Yaxi pads do to the porta pros, they tame the bass a bit, increase the soundstage and increase the comfort. The grado pad upgrades are also interesting on the kph40, the G pads sound off to me compared to having them on the kph30i but the S pads fit decently and sound pretty good.
strip the outer jacket off of about 10-12" of the wire, clip the bare copper shielding at the base of the cut (wont be needing it), and make two twisted pairs out of the 4 wires. black/red, and blue/clear. heat shrink over where you cut the jacket, where the two twisted pairs split off.
The Koss Porta Pro® Communication Headset Headphones feature On-Ear, double sided design, Connects via a single 3.5mm TRRS connector, Lightweight design for
Koss eventually branched out into creating home theaters, DVD players, portable media players (MP3), tabletop stereo systems, and boom boxes but has since closed the “Koss Electronics” line. Koss Corporation now focuses on what they do best, manufacturing both dynamic and electrostatic headphones and microphones.

21. I've never heard the porta pros, but I have heard the KSC75's and the UR40's. The KSC75's and UR40's sound very similar. I would say that the UR40's are a bit better because of the housing, but I haven't compared face to face. As you can see in that thread, the KSC75 and UR40 share the same titanium coated driver, while the porta pro has

Whenever people ask for recommendations for a budget pair of portable headphones which provides a large amount of satisfying bass, the Koss PortaPro will always be among the first in the list, with a very very good reasons. Its design is very funky looking retro 80’s style, due the fact that its actually from the 80’s! BY7R4.
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    • koss porta pro media expert