For testing the Headphone or the Earphone as follow

Type 1600 H

TYPE 1600H can test the frequency response sensitivity DCR AC impedance and impedance curve distortion polarity Fo Qm Qe Qt parameters of the headphone, rapid testing.

Type 1840 H     (New Type)

TYPE 1840H can test the frequency response sensitivity of the headphone,  rapid testing.

New sets ------> Type 1600N     or     Type 2100

( High Speed Auto Electroacoustic Test Set with LAN )

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