Now that I got all 3 of them. Here is my ranking (all in stock):
Porta Pro << KSC75 < KPH30i
The KSC75 and the KPH30i is library dependent. Thats why I like the KPH30i more.
The Porta pro on the other hand just sounds too bloated and dark to me.
Kph30i sounds the best to me.
Have you tried KSC75 drivers on Porta Pro headband? The headband presses the drivers closer to ears and improves bass.
No I havent and I wont. I hate the porta pro head-band.
I have ordered some parts express headbands though and might try it on the KSC75 and the porta pro (possibly the KPH30i as well, but it doesnt need it I think).
Looking from left to right, this is exactly the order and the modifications in which I like the Koss headphones sonically.
The KSC75 with the Parts Express Headbands and the Yaxi pads is, for me, the clearest and certainly the most precise in terms of sound interpretation.
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By the way, the Fiio BTR5 is a congenial delivery partner for all Koss headphones, both in terms of sound and flexibility, this amp is a fantastic match.
If you set the values to 60 ohms and 101bB, you get a wonderful sound.
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Itâs always fun to see how certain preferences can be so different between people. I agree with your comments on Koss trifecta (although I prefer KSC75 over KPH30i) but I absolutely love Porta Pro headband. Itâs light, comfortable, foldable and funky looking. I guess I should add that for some reason it doesnât pull my hear at all. Maybe thatâs why Iâm not annoyed by it 
Hopefully parts express headband will be a better fit for you. I also ordered it just to see if Porta Pro and KSC75 will sound any different.
Yeah, the porta pro band is going to make me bald lol.
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Am I the only one who thinks the clamp on the KPHâs is insane? The shpe of m ear is literally imprinted on the cushions! (grado pads on the way)
Besides that Iâm loving them. I wanna mod my KSCâs for MMCX but Iâm scared of fucking up xD
The problem is fairly easy to fix. Stretch the headphones over a yoga block or a couple of books and carefully warm the headband with a hairdryer, stretch it a little further and then let it cool over the yoga block. Ultimately, the headphones are very comfortable together with the G-pads
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Got the KPH30 yesterday, and damn, I am impressed.
I donât think they sound as good as ârealâ headphones, but they are damn close. They are relaxed and the bass is seriously impressive! Imaging is good too and all in all they sound good enough to listen too while working/walking etc.
The best thing for me is how light they are. Sometime I get tired/hot from having my ears covered for 3 hours in a row. This is a very welcome variation to listen to for another hour after that happens.
Havenât taken them outside or anything yet, but can imagine they are usefull there too. Dare I even say they might be pretty good for gaming!
I personally donât see the need in modding them, I have plenty of over ear headphones 
I actually like the small footprint these have! The comfort is not bad at all imho (I prefer them over my PC38x comfort wiseâŚ)
Well shit, dude, you literally gave one of the most toughest questions out there like come on! All of those headphones from Koss are damn good, therefore deserve all of the love. I mean if you have a lot of money? go get Kossâ Audiophile set or Audiophile Starter kit (whatever the hell the name of that one is) since youâre getting all of those headphones for 100 bucks (if they are on stock of course).
But it really depends on you, if I want a bit of a Bright sound, KSC75s. If I want a sound that is on the Warm sound but freaking good for music and has Low end, KPH30i. I donât have the Porta Pros yet, so I cannot describe them but due to the given people who have owned them and said they are good, Porta Pros are good.
Also if you are going to get a Koss headphone like those, it is ESSENTIAL for YOU to get some Yaxi pads on them, for they are going to be endgame for sure imo! (Also you can do the Grado pads mod on the KPH30is as an alternative.)
Damn you people and your Koss propaganda. I just ordered the KSC75 and Yaxi pads. I hope youâre happy.
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I like em better than my KPHâs 
No yaxiâs though. Anyone know where to get them in europe? And do they only come in blue and red? I kinda like the more stealthy look of my black KSCâs.
It depends on how big your head is. The yaxi pads are too big for me so they butchered the sound for me.
IMO; Porta pro (stock or parts express headband) < KSC75 < KPH30i
When you listen to them you will understand. They defy reason and common sense. The value proposition is hilarious honestly. Oh yeah and they scale with good source gear. Somehow.
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to OP from 2019: just get them all, donât cheap out, and compare them yourself. Come oooonâŚ
The looks inspire really low expectations so Iâll likely get a pleasant surprise.
What tip does the wire have? 3.5mm?
Well, Iâm almost embarrassed to admit that I probably use my Koss headphones more than I do the expensive ones I have (Iâd say which, but that would be even more embarrassing). I donât have the clip-on ones, but do have the other two⌠both with Yaxi pads.
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propably because a. they have a more âfunâ-oriented signature then your higher-ends and b. at least to me, the effect of these weightless things to sound that great (in case of the kph even impactful) has just so much character, itâs just awesome. Sure, you still know that itâs not the top end of hifi development, but who says, that i.e. less dynamics, more compressed sound, less detail etc. canât just still be more enjoyable than technical superiority?
They look and feel like all of $15 for sure. And they are terminated in 3.5.
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