Microphone system for internal positioning

Excellent internal microphones system for accordion.
With the natural sound of the instrument with intensity.
The sound quality is the best with full harmonics.
The isometry is perfect and the response are symmetrical to all notes.
It has a special circuit that controls, almost eliminates the feedback and the whistling.
This professional system is designed on a board with no height.
It has a total of five special microphones (anti feedback), 4 for treble and one for bass.
The capsule has a hypercardioid diagram and linear frequency response: 20 Hz - 20 kHz.
The system has volume control.
For operation, need a XLR input with phantom power (22-48 Vdc).
Includes a special cable to connect the console.