I prefer the KSC75. The 30i are good for a laid-back listen, but I canāt stand the muddiness and lack of detail they have in comparison. You arenāt the only one.
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Absolutely agree. KSC 75 signature is my favorite too. Best for vocal clarity for me. Parts express headband increases bass a bit, and Yaxis make them much more comfortable. (I have an extra pair with the earclipsā¦canāt beat the portability,)
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Would you say MMCX connectors are the best connector for all of those headphones?
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When I first built it I thought it was, but now I feel like 2-pin is far superior because you donāt have to use so much force to remove the cables, and possibly rip the epoxied connector off from the housing. My PortaPros and KSC75ās are MMCX, but the KPH30i is 2-pin. Iāve wrote the detachable cable mod for it in the forums in fact.
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Thatās a shame you havenāt ended up enjoying them that much. It seems like there are definitely mixed feelings on these - one personās warm is another personās veiled. Iām still kind of interested because I do quite like a warm sound sig. That being said though, Iām quite happy with my KSC75 and Porta Pros at the moment and thereās a few other things I want to try/need to save for right now haha.
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I see. Iām likely to do something similar. I have a 3D printer so I might be able to get creative as well. I mean just look at this thing.
Anyway, I saw you wrote this comment on your post that you were going to use the longer 0.78mm 2-pins. Have you tried them?
For sound, I like both KSC75 and KPH30i for different reasons, but the KSC75 is physically painful hanging on my ears, even with the new YAXI pads I put on them, which is why I want to mod them as soon as I can.
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I have only 1 pair, and it took 2 months of it to arrive because of the pandemic. I was going to put them in the PortaPros first, but thatās also taking its own sweet time to arrive too. So itās gonna be a lot of time waiting for the parts to arrive to do the KPH30i at this point (I also need new Yaxi pads).
I shall await your results with great interest 
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Youāre listening to the wrong kind of music with the KPH30is. Try wide sound stage music, like acoustic guitar, jazz, bassy chill hop. Theyāre not as detailed, but theyāre wide, open, not fatiguing, and in slower music, there actually is a fair amount of detail. They are not geared as much towards, for example, female vocals, violin, and harp. But again, in some slow music with less siblance, and airiness, the KPH can deliver. You can also try amping them, just donāt overdo it. They sound great on a 789.
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thatās basically everything I listen to lol
after months of use, I still prefer the KSC75 on 95/100 songs
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I agree with pretty much all your statements about the 30i. It really isnāt all that impressive compared to other headphones. All that it has going for it imo is fun bass at an affordable price. The detail just isnāt there compared to the 75, itās no contest there. I prefer the 75 as well.
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I love mine, but canāt seem to run them off my amps. Whenever I use a quarter inch adaptor with these the sound gets all messed up. Has anyone else experienced this?
hmm mine works just fine ā¦ could it be the adapter? maybe try a different adapter or the same adapter on a different headphone?
Yeah Iāve run mine off my Asgard 3 and my old Magni 3 and it definitely improved the sound - it didnāt make it worse. It is probably the quarter inch adapter being the problem, I would think?
I had that issue not sure if the same but when plugged to amp it sounded quiet and muffled. Solution was to either pull it off a bit from quarter inch adapter or final solution to change that damn adapter for one that works.
I have had that issue before and it is usually an issue with the adapter like the others have said. The adapter causes a short within the jack which messes with the audio.
Switching to a different adapter almost always fixes it. Once you confirm the fix throw away the current one.
My KPH30i broke. I guess the driver and housing are wedged into a rubber washer on the band? Does that come off often? Well i jammed it back in there as best i could. but it fell back out. So i put it back in and superglued it in. hope it holds. it really does sound great for movies and youtube
If not, I believe they are pretty good about warranties.
I bought an extra adapter from Sweetwater. It sounded all messed up with my Porta Pro. They work fine with an adaptor that came with my 6XX, however.
Koss has a lifetime warranty, so you could probably get them either fixed or replaced (unless theyāve been modded, maybe). I modded mine with Yaxi pads, so Iād guess my warranty is kaput now.