It’s custom yes.
Hi,
Some conclusions?
They arrived broken with unfinished paint job.
Since the tweeters weren’t mounted correctly, they were playing extremely quietly. I can’t give an accurate all-around impression of them due to this. But I will say that the bass nor mids were anything special, not even close to the asking price.
I returned them and got my money back.
Sounds bad for a product at this price …
I was already planning to sell UM Mest and buy Mundak or Noosa / Matawai.
But if the build quality is at this level,I will thank them and go towards Craft Ears Aurum.
Unfortunately I think that is the wise choice.
UM MEST is probably head and shoulders above anything they can offer. If you want to go to the next step, maybe look at Elysian Acoustic Labs.
I looking for som bass heavy 
Something like W9 in EE earphones 
I mainly listen to electronic music and rap.
Afaik,
Dunu Zen may possess the greatest sense of slam (dynamism) out of any IEM.
The Z1R is said to have the best bass in the game all things considered. IE900 trailing right behind.
Then there’s the Monarch, Variations in the tier below.
Audeze Euclid is lauded as having the fastest and cleanest bass of all, but perhaps won’t be what you seek for quantity wise.
Seems really really good for what it aims to achieve.