I am conveying what my ears are telling me. The gold might be called the "vocal" version because the mids are more forward and the presentation is close to the Cresyn C750E
, but with great bass. I do notice more than a subtle difference between the gold and silver. I don't want to speak for shigzeo, but since he was hearing too much bass, maybe that is why he didn't hear the differences I am hearing.
My experience possibly is primarily due to the tips, and of course my ears. Trying standard silicon tips (and the included tips), these did seem very bassy when inserted deeper than I insert my dynamic IEMs. I did not give a lot of ear time to these tips, but once I found the dual flange tips worked well, all my listening has been done with those.
My ears are telling me that the overall presentation of the gold is more forward in the mids and bass. At the same volume level the bass with the gold is too much as it is more in my face like the mids.
I also have many more hours on the silvers than the golds, so the gold could mellow out with age as the silvers did. And these do take the right tip combo combined with time (maybe 200 hours).
I guess we need other WM2 owners to chime in.