Completely agree, one of the best IEM expirences i’ve had so far. Soundwise 
Cable is too bulky and I wonder if BC drivers are even connected. I don’t feel any vibration, does anyone?
I also found them very capricious in terms of choosing eartips.
I needed to calm down those high frequencies, so in the end I settled on deep sealed CP100 / foam tips with narrow bore. Most of the others tend to present them overly bright.
But nevertheless for me it’s definetely a TOTL. The sound is just amazing.
First ballot Hall of Famer for sure…the original GOAT
still comes out of the case every now and then
RE: “Feeling vibration”
Fun little experiment I did years ago. I plugged my ears with earplugs, and put over ear headphones on. Then I attached aquarium tubing to the nozzles of the IEMs so all air moved by the IEM would be pushed further away from me. I turned up the volume on the IEM to medium-high levels, slightly above what I would consider comfortable, then I had someone press the back of the IEM shell against the rear of my skull, front of forehead, temples, etc…
I was able to guess the song every single time, given that it would take a little longer for some songs with quiet portions. I also noticed that pressing the shell to the forehead would give a “center image” with you hearing it in both sides, similarly pressing it to the back of the head you can tell its from behind. I had my test collaborator press one unit plugged in and one not plugged in at the same time and I was able to guess the song and the direction it was coming from given that the volume was loud enough. It also made a difference if it was contacting hard tissue vs soft tissue. For example I could hear sound when making contact with the furthest part of my bony jaw when I couldn’t hear it when pressed against softer cheek tissue which is closer to the ear. I knew that this wasn’t air from the drivers making its way to my ear drum because the sound abruptly cuts off when contact is broken.
Pressing the back of the shell to different parts of the head creates different frequencies I think. Behind the ear its more treble, on the ear its more mids and bass frequencies. Still not too sure. One of my main takeaways is that surface contact directly impacts volume of how much you can hear from the BC. Plus there might be a slight L/R channel crossover effect where L channel BC finds its way into the right ear. I can’t notice it, but if pressing against my forehead gets sounds to both ears, then the IEM seated in the left ear will eventually get vibrations into the right ear. To how audible it might be in real usage. I don’t know.
Nor do I know what percentage of the overall audio experience is made by the BC. You could map out how much air each individual driver in a regular hybrid/tribrid IEM is moving, and the SPL contributed by each driver but BC doesn’t move air. I don’t know if we’ll ever have a way of quantifying how much MEST BC drivers contribute to the overall sound experience.
The BC in the MEST is the piezo type so they dont vibrate like the other kind does.
