Hugh Hetherington Hearing Aid Museum
Hugh Hetherington Hearing Aid Museum

The Hearing Aid Museum

Hearing Aids of all types—Ear Trumpets, Carbon Hearing Aids, Vacuum Tube Hearing Aids, Transistor Hearing Aids, Body Hearing Aids, Eyeglass Hearing Aids and much more!

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Click on the "General Information" button (top button above) for an overview and general information on this category of hearing aid.

 

Behind the Ear (BTE) Transistor Hearing Aids

Oticon MultiFocus Behind-the-Ear Transistor Hearing Aid

The Oticon MultiFocus BTE hearing aid was manufactured by Oticon A/S in Denmark in 1991.

The MultiFocus name referred to the fact that people reported their hearing became multi-dimensional compared to their previous hearing aids.
 
Technically, the Multifocus used analog technology. It had two channels that split the frequency at 1,600 Hz. The low-frequency channel had wide dynamic range compression. The high-frequency channel had linear gain.
 

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The back view of the Oticon MultiFocus showing the adjustment section (middle) and the the 3-position "M" (microphone), "T" (t-coil) and "O" off switch (shown in off position).

There are 3 adjustment screws. The top screw..... The middle screw adjusts the overall gain (30 to 90 dB). The lower screw adjust the peak clipping level (70 to 90 dB).

Incidentally, the Oticon MultiFocus did not have a volume control. It may have been the worlds first BTE hearing aid without a volume control.

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The back view of the Oticon MultiFocus showing the adjustment area with the faceplate covering it.

 


 

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The underside view of the Oticon MultiFocus.

 


 

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View of the Oticon MultiFocus showing the battery compartment (bottom left). This hearing aid took a No. 675 battery.

 


 

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