Interesting. I'd sure like to hear your set up in that room. Over the years I've heard quite a few different studio headphones and most of them sound a bit more balanced/flat than the 240S to these ears. I hear a big boomy upper bass on those. If I eq it out then they sound closer to the other studio phones I've heard....and my monitor speakers as well. They are almost the polar opposite to the v6, which a lot of folks claim is flat/balanced. Have not heard the Mk II. One person posted on another thread that the dt48 was the closest to his Dynaudio BM6A monitors in a treated room of all the phones he's heard. Some even claim the 70X sounds close to the Adam A7 monitor speakers. It's all too confusing to begin to try to get any real consensus on what is flat or balanced....or neutral. Apparently even people with extensive professional audio experience hear VERY differently.
I never said the K240 Mk II was flat. 
Just that it's more balanced to me for what I'm looking for in a headphone. But by no stretch of the imagination is it a basshead headphone.
I had a pair of DT48e's for a while. Didn't like those much along with any of the DF or K240M.
But one problem I have is that many people say that the DF is flat, or the M is flat, or the DT48 is flat, or the K701 is flatter. My problem is that I have extensively characterized my home theater with static SPL freq response measurements as well as software such as http://www.etfacoustic.com/ (to look in the time domain). And I do have as flat a frequency response as anyone would get in my room. But ... the K240 Mk II (Studio) and K240 Sextett sound a heckuva lot more like what my home theater sounds like than the DF/M/DT48/K701.
Here's an experiment for any of you: try watching/listening to U-571 with any of the above headphones. Now ... which one seems to convey the action of the movie better? 
Many people say that the K701 has a "treble emphasis" ... specifically because ... it has a treble emphasis and is bass deficient. Not because it's any flatter than the K240 Mk II.
