I suggest listening to them

I honestly think KSC75 are subpar when it comes to Koss. There is no reason to buy anything from them besides Porta Pro or KPH40.

Scratch that, if you like overly bright headphones to the point of it being harsh, then the KSC75 is for you, but otherwise, porta and KPH40 are better in every other way. I don’t think KSC75 or KPH30i are “value” headphones, I think they’re priced exactly what they are worth. The problem is that the overwhelming majority of laymen out there have only heard garbage headphones for $20-30, but if you look within the hobby, there is so much better you can buy at the same price or a little more.

The what???