Well after using these a little longer I'm still sticking to my thought's on Source/Music. I hooked up my M-Stage to my Marantz CD-5004. And I still notice the source music makes a difference. That being, anything that has been mastered badly, still sounds bad. Forget "Loudness" War cds. They sound Horrible on the Koss. These headphone are very picky when it come to the music being fed to them.
They sound the best with any " Original" Pressing I toss at them. I know I'm going off topic now..lol
But basically these really need a good Source, and by that I mean music material. They work very well out of your Ipod/Com
But put a little power behind them with a good mastered cd and it's really is a nice experience.
I'm listening to the Original Canadian Anthem Pressing of Rush's -2112 and it sounds stunning!! Very Analog sounding!!!
I guess the old saying " Garbage in, Garbage out" is really true....These headphones really show that, clearly.