yes. just to share an update.
the m50 moves up a considerable amount in my book.
i recently upgraded my work rig (from an ibasso d4) to the nuforce HDP.
and, i feel that at least a small part of my qualms with the m50 was the source and amp.
the balance mod and 840 pads are helping as well. it's just hard to say the degree.
the pads, to me, are definitely worth it.
what i was hearing before, was a sort of veiled or slightly recessed vocal. that wasn't there for the first while i had my m50. i attributed this to burn-in and the headphones settling into its final sound signature.
which, in my book, wasn't great.
however, i honestly think it was mostly due to the bass, which had loosened up during burn in and began stepping on the mids. and the stock pads squishing down considerably and becoming crusty.
whatever the real science here, the results are a better sounding set of cans. and i'm happy for now.