Aurex HR-D3

Commentary

This headphone was developed by applying the know-how obtained with the condenser type to the dynamic type.

The diaphragm is a cone-type speaker using a polyester film with a diameter of 5.7 cm and a thickness of 50 microns.

The case is semi-open air to eliminate the sense of sealing.

Model Rating

Type	Dynamic headphone
Units Used	57 mm Cone Type
Impedance	8 Ω
Frequency characteristic	20 Hz to 20 kHz
Output sound pressure level	106B/mW
Maximum sound pressure level	136 dB (Allowable Input 700 mW)
Harmonic distortion factor	0.5%
Ear pad pressure	240g (Ear Spacing 150 mm)
Code	4-wire 2.5m vinyl cord with stereo plug
Weight	235g (cord not included)