The A 1 is a hearing amplifier for people who wish to improve their hearing only in case of need.
Switching on and off, adjusting the volume
The device is turned on and off and the volume adjusted by turning the knurled knob on the top (see illustration on last page).
The A 1 is equipped with an automatic gain control
If the wearer speaks or there is a loud noise, at the very same moment the volume is sharply reduced. Unpleasantly loud sound peaks are thus prevented, and the wearer’s own speech retains its natural sound. The automatic gain control is set in the factory to provide optimum comfort.
Adjusting the frequency response
Using the adhesive strips provided, the small holes in the receivers transducers can be closed. The frequency response changes depending on how many holes are covered in this way (see illustration on last page). If all holes are left open all sounds are balanced, to a considerable extent. If all holes are closed, primarily speech is transmitted.
Power supply
The A1 has an economical and
Technical data |
|
Frequency range | 100 - 12,000 Hz |
Transducer principle | Dynamic |
Microphone | Elektret microphone, mono |
Acoustic amplification | approx. 30 dB |
Characteristic sound pressure level | 124 dB at 1 kHz |
Operating time | approx. 10 hrs. |
Weight | 45 g |
Scope of delivery (except for | 1 A 1 hearing amplifier |
supplementary package No. 03713): | 1 |
| 1 storage battery BA 90 |
| 4 adhesive strips |
Subject to modifications |
|