I found them boring until I switched amps and upgraded it's cable (to something cheap, but good). I've found the HD-650 really does benefit from a better amp, but to a point. I almost got them to sound like my HD-598, but with a small soundstage. No, I didn't plan it that way
It seems like 90% of headphones could be labeled as boring to different people and it all just comes down to preferences. You either like a somewhat dark headphone or something that's fairly bright. I'm basically in between, like the K601 or HD-598.
Edited by tdockweiler - 5/31/11 at 12:22pm