ear trumpets

diaphragm

3/4grilleearside
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image of ear trumpet
103mm
image of ear trumpet
130mm
image of ear trumpet
148mm
image of ear trumpet
338mm
image of ear trumpet
377mm

Among the many different designs there was quite a movement for the use of diaphragms.

A resonating diaphragm is unlikely to help the user.

But sometime the placebo affect was enough to convince the user that the trumpet was worthwhile.

The Ayleworth example is the only known one worldwide.
5 examples