These should not be under your radar, they should over your head man. I am telling you, if you think your SG2 / ksc75 sounds good be prepared to be blown away with this things.
Think, KSC75 with a big beatiful subbass that hits low, fast, clean and detalied. Mids more foward, more sparcle without sounding to treble heavy, details you will never hear froma a koss, man i am telling you, these murders the ksc75 no mercy.
Keepmthe ksc75 for the price/sound ratio, for 15 bucks its one of the best buys out there, but if you want something WAY better, S500.
For the price, these things are outstanding... Hard no to sound like a jvcfanboy.. But whe all know that whe are not crazy cause whe know how good this things sound.