Thanks all for the info. My amp came in today and it does clean things up a bit. I wish they were a bit further on the highs but they are good. And for a total investment of 200. I really can't complain. Still the bererdynamics 880dts connected to a studio headphone amp sounded quit a bit better. But that was probably closer to a 800. Set up. I am interested in these cheap tube amps I see on eBay and mentioned on this forum. I may get one of those to pair with my e10. Last thing, I do a lot of garage selling. I find old receivers all the time. Any one know of some older receivers that have good headphone amps and freq range.
As for the the k240mkII and the e10. Without the amp I can only listen to them at about 50% of my preferred volume, I don't listen to music loud either. With the amp I could blow my ears off if I wanted and for the most part the music stay tight. I did notice that at extreme volumes (metal head) volumes, the lower frequencies began to get muddy but this was way louder than I listen. It was also only with heavy metal music. I listen to movie soundtracks, classic, world, and a bit of house. These did great for all of these. Base was great for an adult or discerning youth but would not likely satisfy base heads or anyone who wants to feel the music. As for the e10 it seemed to to its job we'll I do not know if it is to blame for my missing upper frequencies or just the headphones. If I get a chance to plug it in to something nicer I will let you all knows.