I need to spend more time with them to be sure, but I do feel that like the HD650 they do an amazing job with the mids. They sound full and well detailed, but they're not very forward compared to the other ranges. I think they have a bit better sparkle up top than the HD650 does, and with a quicker fall off in the bass. The bass boost function on my E12 paired with the crossfeed is one heck of a combo when used with the L2. So with my current listening, I wouldn't say they're n-shaped like the HD650, just that they have excellent mids and a slightly warmer signature. While the sub bass is definitely less than the HD650, I think that the lower mids help make the sound seem warm. Not dark by any means, but nice and comforting after using the HD650 exclusively for a while; the sound is still familiar in a way.