Weāre probably in the wrong thread so @Ohmboy feel free to move this since most will be MEST related but Iāll get to the pointā¦ Iāve seriously been thinking about this lately and rediscovering my early assumptions about driver types and differing DD materials used.
I used to think that a certain driver material type was either better or worse. I had my favorites and expected everything that was made with the same material to behave similarly (technicalities) and sound similarly. This assumption held water for a while but as I heard more and more IEMs with the same driver and driver materials, I quickly realized my assumptions were bullshit and were not accurate.
So long story short, Iāve learned not to put too much stock into the advertising buzz words IEM manufacturers are using this month. What matters is how the end product sounds tonally and its technicalities. Not what coating is used on its DD. If it sounds good, it sounds good. If it sounds bad, it sounds bad no matter if you make your entire cap out of 24ct gold and line your air vents with fake diamonds (YEAH! Iām looking at you Fiio!).
Onto the MEST MKII Bassā¦
Iāll be honest that when it comes to studying IEM capabilities, most of my personal time is spent picking bass apart.
This ties into what I just said because I pretty much bought the MEST because I was really upset at the time with a certain IEM and retailer and I just wanted to break away and I just threw my money at Music Tech and Chrisā top #1 rec. I hadnāt put any effort into studying it or really even looking into it if I thought Iād like it or not. I just did it for the hell of it. Almost like revenge towards the retailer I was upset with.
When I first heard the MKII, I thought I knew how all DDās sounded for the most part. Different DDs made with different materials presented the bass more or less textured or not and could portray the bass quickly or more slowly either with a sharp leading edge or not etcā¦ The MEST MKII bass had none of those specific characteristics I had learned to expect. It wasnāt overly fast like beryllium can be (Legacy 2 for example) and it wasnāt slow or undefined. It also hit with authority that I did not expect almost like the Zen but not as extreme. For a lack of a better term, I found it to be as near perfect as I had ever heard. It had no strange behavior or weird/overly textured sound to it that was detached from the rest of the music as some hybrids do, it just sounded right to my ears.
This experience especially kinda forced me to just throw out my assumptions and learn to simply judge the IEM for what I hear it is capable of and donāt come into it with predefined expectations because I already think I have a general idea of how something will sound because of its driver make up and the materials used.
Iāve also had a few chats with some buddies that have the MEST MKII. This one just came to mind because this guy just got his and this was his first reaction to hearing itā¦
āGonna ab test some stuff, but I donāt get why so many iems canāt get the kick drum correct. Itās always a boomy thump instead of an impactful thump. The Mest got it right.ā
I still donāt know how the MEST MKII does its bass and I really donāt care. Iām throwing my assumptions away and just going to sit back and enjoy it. However its done, itās done well. I like it.
My 2 cents, hope my insights are helpful. Always, still learning. 
