I have recently acquired the He-500. I find when I listen to them my ears get fatigued fairly quickly and it feels like it is from the bass. This being my first taste of orthodynamics except for a 10 minute try out of the LCD2 I am not used to this much bass. However when I switch to a pair of AKG712 headphones (with far less bass), everything over the entire range feels a bit hollow over the whole range. Or does bass really cause much fatigue - is it usually coming from higher frequencies? I am using an Musicstreamer II+ and an Asgard 2. I will probably end up just messing with the equalizer in Foobar but any suggestions would help. It feels silly to EQ out the deep bass that the orthos do so well Other than that these are by far the best sounding headphones I have ever worn. The detail is marvelous. And everything just feels so natural. I was a bit disappointed with the sound stage at first, especially after hearing the HD800 recently, but I kind of realized that a lot of my music might not necessarily have a wide soundstage.