Originally Posted by MaloS
You should satisfy yourself with an answer that makes sense from statisticaly/engneering points of view: No, UM3X won't be close to ES3X. You can hope for more of a hint at ES3X sound, assuming we can observe same parallels as between UM2 and ES2.
I agree, and would also add that it would be very odd to have a very similar sounding universal IEM to their flagship custom IEM and costing less than half the price.
I wonder, though, if I didn't have the ES3X's how the UM3X would sound now that I know that, at least for me, ONLY the soft silicone tips did the trick for me with the W3's. I know I just couldn't use any other tips as I found them very uncomfortable and didn't get the right sound out of them either.
So, I wonder if it wouldn't have been wiser for Westone to include the same tips they provided with the W3, or perhaps being designed for musicians the UM3X are not intended to be used with the soft silicone tips as they may alter the sound in a negative way. In that case there may still be a strong case for the W3, for those, like me, who got the best sound from the grey tips.
I know, I know, it's all speculation at this stage.