I completely disagree that detail comes from more treble. That is absolutely nonsense. The detail come from accurate frequency reponse AND phase response, and controlled behavior of the sound reproduction. Details CANNOT be "produced", they are "reproduced", or I should say "revealed". They were in the recordings. If you can hear them live when they are recorded, the good recording and mix keeps them. However, whether the speaker or the headphone can reproduced these information is a question. If you feel the door knock but cannot tell whether it is real or not, then, it is good! I get from the SRH940. Now, the SRH940 is ment to be a studio monitor whether you like it or not. I see so many people talking about how they like or dislike the phone but forgot Shure created this creature for audio engineers. Whether you caries the phone with your ipod was not the first thing come to mind when Shure created this product (Shure did not try to impress any ipod fans in their marketing of 940, at least I did not see it). So I see everybody is missing the point. You like it or dislike it is irrelevant but the real question should be: what kind of recording will be mixed and sound when the 940 is used for mixing and how well the final recording will be. You know, if your reference is wrong then the final product will be wrong which is actually the recording behind your source!
So, the great news is, if 940 is bass light then the mixes using the 940 will always have more bass because the audio engineering wants to balance them out then all the recordings based on this will have more bass to get everybody happy (haha).