I think this is very respectable for a $16 can! 

They look pretty darn fast and clean!  I prefer these to a lot of much more expensive headphones.  ultrabike, you're not alone on that one!  Though I haven't listened to mine in a while because the left side went out.  Koss warranty isn't really worth it for these things. 

Mine were recabled with something schitty so that could be to blame.  I actually preferred the ksc-35 back in the day but they were prone to getting rattley after a while.  They were warmer though, I imagine they'd measure smoother and more neutral.  Would be interesting to see.  I'm suspicious that the titanium coating on the ksc-75 was done for durability, not SQ. 

I love using the ksc-75 for comparison on head-fi.  Always fun to say that I prefer them to a 1k flagship.  :-)

Don't they need the Karmer quarter mod??   

I think that takes them from HF2 to RS1.      

I'm actually surprised these measured this bright, I never thought of them as being particularly bright or bassy.  But it's been a while, as I said

The SportaPros have KSC-35 drivers in them. But they do not sound like KSC-35