Hi,

I just bought these headphones as an upgrade from my HD580's and was
wondering if I made the right choice. I have read the 580's sound very
similar to the 600's and 650's. I am hoping the hd 650's are signficantly
better. To drive the 650's I will be using a cmoy tin amp with my computer
or portable player, or my Luxman tube amp.

Any recommendations? Thanks.