Here's a fun story for KSC75 fans:
I had two pairs of them sitting in my drawer for years, unused after I've been using IEMs, open back headphones, and earbuds. I decided to try them out again, except this time I ordered some Yaxi pads after reading good things about them. There was also a PortaPro in there I compared to the KSC75, and so when the Yaxi pads arrived I did some listening this past week.
Excuse me, but how in the hell do these sound so good?! Putting Yaxi pads on the KSC75 is a HUGE transformation that I don't see many people talking about! The soundstage gets so much wider, sound is fuller, deeper, and actually a little brighter. It was a bit too bright for my tastes, but the treble extension and quality is only a little bit behind my Focal Clear MG. Sure it's not as detailed or realistic, but the fact that it even reminds me of the Focal Clear is amazing. With a little EQ in the treble, they are better in some ways than my Sennheiser HD58X, including treble and imaging.
The PortaPro with Yaxi pads simply can't beat the KSC75 except for the bass, which to my ears sounds fuller and more extended. That is the only thing those have over the KSC75. Now I would probably still take the PortaPro in stock form if I could not use EQ, but the KSC75 is just a much better technical performer and I use EQ with all my other headphones anyway.
I've got a Koss Retrospekt P/21 headband coming in this week, right now I'm using the porta pro headband on the KSC75. I got the orange Yaxi pads for a complete retro look, so now they will not only sound amazing but look great as well. Just wanted to share my complete surprise at how these $18 clip on headphones sound better than many $200 headphones I've tried. Then again, I'm sure people here already knew how good they are!
Pictures to come...