024 IMG_0025

Product Description

The H-143 type, Dynamic Earphone is a moving coil type earphone designed for use in a headband type headset or specific flight helmets, it also has ground crew support applications. The intended use is to provide audio communications under high noise conditions found in military, civilian and general aviation environments.
It is designed and constructed from quality durable high strength Polycarbonate plastic as well as corrosion resistant metals meeting or exceeding the environmental.

Baseline Performance Characteristics:



Frequency response range

100 to 5000Hz

Sound pressure level

91± 3db SPL /0.1W/10cm at 1KHz,Input 1.378Vrms


19 ohms or 300 ohms ±15%ohms @1KHz 1Vrms

Temperature range

-20℃ to + 60℃
-20℃ Duration: 96 hours
+60℃ Duration: 96 hours


Less than 5% at 1KHz 0.1W/10cm

Load test

Input power 0.8W pink noise 48 hours

Humidity test: Temperature


Relative Humidity

90% ~ 95%


48 hours (recovery 6 hours)

Drop test

Drop it no to concrete surface in 3 directions
Height: 1M
Cycle: 10 cycles

Vibration test

Frequency: 1800 cycles/min.
Amplitude: 1.5mm
Duration: 1 hour in each of 3axes

Terminal strength test

Load 1.5 Kg
Duration: 15sec (shall be normal)

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