Which are better overall? Because on amazon I keep seeing the 650 go down in price constantly. As of now it is $409 and the 600 is $399. That's only $10 difference. Are the 650's a different headphone entirely or are they an upgrade from the 600's?
Each sounds somewhat different and it's a matter of preference. I prefer the clean neutrality of HD600; my uncle bought an HD650 because he prefers a richer sound.