The Sultan IEM is the new flagship IEM from Noble Audio.
It is made up of
1 10 MM dynamic driver
4 Knowles BA drivers
2 Electrostatic Super Tweeters (ESTAT)
The shell is a bespoke CNC aluminum body with a hand finished faceplate.
Impedance is less than 35 Ohms
Stock cable is the Noble Audio 8 Core OCC Copper Cable