Moondrop Solis In-Ear Headphones

The Moondrop Solis IEM is tuned to match the sound signature of traditional electrostatic earphones. It comes with four BA and two EST hybrid drivers that are laid out in a balanced three frequency structure. The Solis uses two Danish acoustic electrostatic drivers for treble, two Softears custom BA drivers for the middle frequency, and two Acoustic low frequency BA drivers with shared extra cavity for bass. This structure lets the drivers to work together and allow the tone of the electrostatic driver to come through.
Specs:

Impedance: 7.5Ω±15% (@1khz)
Sensitivity: 120dB/Vrms (@1khz)
Effective Frequency Response: 20Hz-20000 Hz (IEC60318-4)
Detachable Cable Interface: 0.78-2pin
High Frequency: Sonion EST (electrostatic)
Middle Frequency: Softears D-MID-A
Low Frequency: Sonion 37 Series 
Frequency response: 20Hz-45000 Hz (free field. 1/4 inch MIC)