yeah but how much does the D2 cost? I can see buying an E5 for the M50 but spend any more, rather be spending upgrading the headphone. Price return ratio is not great.
The D2 is my portable source, and a fairly good one at that. An E5 is a $20 amp, about a cheap as you can get for an amp. I was just trying to point out that a cheapo amp on an already pretty decent source still makes a difference for my M50, hence my conclusion that amping it is beneficial.