I have the M4s only. I think they sound quite good driven from an external source. They got more "body" and better dynamics driven from my Jotunheim. The M4s internal power source is quite good, "non invasive" yet lack refinement when you comp. it to more powerful outside sources.
With external source, the sound comes alive and is more refined. Compared to the Sony XM5s the M4s have blacker background.. the HPs tend to dissapear more in a good way. I am sold on the M4s for my portable and PC usage. I quite like these. 1 to 3 dB too much bass. Depends on the track.
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