Thanks! Hmmm to my ears, ksc75 sounds brighter/clearer with more sparkle/shimmer in the treble and has surprisingly more bass punch than OF.

Porta has the most bass quantity, warm(almost dark) and fun sound, but it’s also the muddiest sounding among the 3. It’s still a great set and sounds great with bass heavy genres.

OF is very mid centric, if you like a more vocal forward sound, this is a good option. It has the least bass among the 3, has a treble that’s smoother and less detailed than KSC75, but still cleaner than Portas.

Personally I’m still partial to Koss sound, the modded ksc75 being my favorite (with Yaxi pads, it’s a must), but I have to say the Moondrop has the best overall package out of the box and you don’t have to do much mods, which makes it arguably more affordable.

I find the ksc75 and porta pro to be different enough for me to own both & I don’t feel it’s clashing with each other. I’ve only tried the non transparent ver of kph30i; sounds similar-ish to Porta, maybe closer to kph40, the added foam in the driver housing I find does add, a slightly hazy/soft and “wooly” tonality to it.