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.
Ordered the near new unit and arrived super quickly in a pristine condition. A big shout out to Andrew and MhsicTeck team for their awesome support.
These are early days with the MESTs but these IEMs are amazing. The quality of bass stoodout for me in my listening sessions and in my opinion would please any discerning listener. Soundstage not as wide as my Z1Rs but I could happily live with the MEST for the music that I typically listen to. Combined with the outstanding detail retrival and the treble clarity make these IEMs a fun listen. Highly recommended!