Westone came with the UM10-20-30 as well as the World Premiere of the W10-20-30-40.
The UM10-20-30 are the updates of the UM1-2-3X. I listened to the 10 and 30 and felt that they were more balanced and felt more planted on the bass section (especially the UM10 in comparison to the UM1). The mids on the UM3X has always felt too forward for me and the UM30 balanced that out better.
The W10-20-30-40 took a more linear, more monitoring like approach when compared to the old Westone W series. We all remember how much of a bassy IEM the W3 was. The new line up sort of took the previous generation W4 character and created a whole new line up based on that sound signature. The W40 itself felt more lively, spacious and dynamic — that was the pitfall of the W4 — when compared to the W4. The faceplates are now removable too, so you can use a combination of red-blue-black like on the picture.
Dual BA by Japanese manufacturer j-phonic. Very soft tone, spacious and smooth. Very unique tuning and I like it. Like trying to translate the stats sound into BAs. They had two models, the standard tuning and the treble tuning. It’s not like the standard tuning is bass heavy (remember, soft Stax like sound) and so I felt that the treble tuning is just too bright.
A Westone W4 like shape, but much thinner and are more comfortable generally than the already superb Westones.
This one is the treble tuned
Available with different color shells.