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.
Listened to a lot (a whole lot) of IEM's at Can Jam- kept coming back to listen to these. Low end is tight and deep, Mid range is buttery and high end is to die for. Beautiful sound stage, isolate external noise extremely well and they fit me great to boot. I listen through my Ibasso DX220 AMP1 mk2. Pure Heaven. Thanks to Andrew for getting them to me so quickly.