UM Universal MEST
Frequency response range: 20Hz-55KHz
Sensitivity: @1KHz 118dB
Driver Count: 8
Crossover: 5-way crossover system
Driver Configuration: 1Dynamic low+2BA Mid high+2BA High+2EST Ultra high+1Bone Conduction
MEST Bone Conduction Technology
Diagram 1: MEST Exploded Views
Diagram 2:The faceplates of the headphones are specially designed according to the structure of the bone conduction drivers. Bone conduction driver delivers signals by vibrating the faceplate. Then the signals are passed to the carbon fiber shell and finally delivered to your inner ear.
Diagram 3: The bone conduction drivers are made by metal vibration pieces that are covered by piezoelectric ceramics. The ceramic layers will bend the metal vibration pieces to make micro-vibrations according to the changes of input alternating voltage.
Diagram 4: The frequency curve of the bone conduction driver along with the shell on HATS.
I had decided to purchase the MEST instead of the Sony IER-Z1R. Both had fantastic reviews but the MEST was quite a bit less expensive. All the reviews I saw about the MEST were spot on. Not to nitpick, but this IEM sounds very different when it comes to tips- the Comply foam tips I use significantly sound better than other silicon tips. So if you just don't like foam tips for whatever reason, you may want to listen to a pair first or risk being disappointed later. Not sure if the tip issue exists with custom pairs, but with my universal pair the differences are large. I don't now how much (if any) break-in is needed with the MEST, but once I got the tips figured out the first day, I have been in love with these ever since.
Incredible low frequencies that can be very deep and yet remain very punchy, fast, and never fit into the middle.
- The mids and highs are very detailed! And with this detail, they give an unrealistically tasty sound. MEST gives me a lot of emotions. The leg is constantly serving the rhythm))
The high frequencies are very long and crystal.
- 3D scene like in Solaris. But in Solaris it is wider.
- Excellent stock cable. I seriously think that you can not change it to another. It's soft, comfortable, and good sound.
I am currently running the MEST on the ifi zen stack and the ES100 MK2. These are a very bright pair of iems, but never sibilant or piercing unless the volume is high. My ears are extremely sensitive to treble, but these iems are not very fatiguing. The bass is plentiful with the MEST, but requires a good fit. I am currently using the Final audio e series eartips for the MEST and they are currently working very nicely. Unfortunately, as many reviews have already indicated, the stock tips don't fit too well with the shape of the universal model. This is my first "endgame" iem and has a very unique character. The W shape gives these iems a particularly vibrant sound signature that can be described as very exciting. The excellent customer service was flawless as usual, thanks to Andrew.
they sound great for all types of music
they are definitely different, but sound great. for some finding the right tips may be necessary, but these iems are well worth it. highly recommend