Aurex HR-910

Commentary

This is an electret condenser headphone with independent configuration of the main body and adapter.

Uses back electret (back electrode electret) system.
In this method, since the diaphragm and the electret are separated, the efficiency of the electret itself can be increased. Moreover, by making the diaphragm thin, the vibration mass can be sufficiently reduced.
In the HR-910, a newly developed high-voltage electret (a special polymer film bonded to a metal plate) is electrically connected to the diaphragm through a high resistance, realizing stable operation of the diaphragm.

The diaphragm is made of polyester film with evaporated aluminum and has a diameter of 51 mm, a thickness of 2.5 microns and a mass of 7 mg.

The matching impedance of the Adapter part is a 2-stage switching type, and the output can be taken from the speaker terminal of the amplifier and can be set to a through state.

The ear pad is removable and comes in 2 types, ear pad type and ear cover type.

Model Rating

Type	Electret condenser headphone
Headphone Section
Drive system	Push-pull full face drive
Capacitance	60pF
Diaphragm	2.5 micron thick polyester film diameter 51 mm Metal (aluminum) double-sided deposition
Frequency characteristic	20 Hz to 35 kHz
Output sound pressure level	93dB/3V (H position)
Maximum sound pressure level	115dB
Harmonic distortion factor	0.5% (at 400 Hz standard input)
Ear pad pressure	250g (Ear Spacing 150 mm)
Code	Copper foil with stereo plug 4-core bagging 2m
Weight	240g (cord not included)
<Adapter part>
Format	Input impedance switching type
Input impedance	8 Ω (Low), 1k Ω (High), Speaker, Direct
Code	1.3m, curl cord
External dimensions	88 mm wide x 22 mm high x 151 mm deep
Weight	480g
Attachment	Carrying case