Hey. I read reviews about these and heard that there was more bass quantity than the HD650. But, I just upgraded from HD555 and I couldn't tell the difference. I just bought these yesterday though. It's not really a burn in problem as it has had about 20 hours. Recently I purchased a UDAC for my HD555 and I instantly noticed the difference in sound quality compared to my onboard sound card. So I figured that by purchasing ~$400 headphones I'd instantly notice the ES10 improvement over the HD555.
I read in another post that another head-fier, when he upgraded to HD650 from HD555, was disappointed, but after 2 weeks he was able to tell the difference.
Is it just because I've been listening for HD555 for about 2 years that I'm just "not used" to the ES10 yet?