Here's -39db floor

These do cymbals like no other...even my HE400s can't match up against it in terms of cymbal fidelity.

After all this time I can't believe i still haven't bought a pair of these. I think I better buy a pair now since I need one for exercise anyways 

An interesting I observe with the stock KSC75's is that they sound thin, anemic, and lacking the bottom end thoroughly, if you use the earclips. With (any) headband mod and allowing them to press against the ears fills up the lower midrange and bass dramatically, makes it very tonally balanced.

Personally I have mine quarter-modded and clipped onto a PortaPro headband, it sounds insanely good, competes for headtime against my HE400s even.

I used to also have some plantronics earpads that increased the bass and lower mids a good bit. I might get another pair of those to put on the ksc75 to make them sound bassier and fuller even when using the clip on.

That's definitely a possibility. However I've gone through probably 6 pairs of different earpads trying to get these to sound best, and in the end the stock earpads with a quarter mod is still the best - the perfectly flat midrange is only preserved by them, any other earpad that increases the lower end muffles the sound considerably as a tradeoff. Having a headband mod, however, does not interfere with the mids, but also brings out the bass, so it's perfect IMO.