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Fit the mounting panel in such a way that it cannot vibrate while operation. There may
be no gap between the wall surface and the ST panel, or, if any, it must be sealed
properly to eliminate acoustic short-circuit of the loudspeaker and acoustic coupling
between the loudspeaker and the microphone (see later).
Caution
Make sure that the microphone hole is sealed properly to sense the lift
cabin sounds only and suppress the noise coming from the shaft or cavity
behind the wall!
Off-Panel Microphone Mounting
By default, the microphone is placed directly on board (see drawing for microphone
position). If required, a cable-equipped microphone is available, fitted to a holder of
the size of 25×25 mm with self-adhesive foil. This helps mount the microphone behind
any hole in the wall surface (a hole with the minimum diameter of 3 mm, or a group of
smaller holes of the same total area). Board of version 5 and higher has both onboard
microphone and the connector for external one. Switching to external microphone is
automatic (external microphone is detected).
The minimum distance between the loudspeaker and microphone centers is 90
mm. With a smaller distance an acoustic coupling might occur. A bigger distance,
however, is allowed.
2N® TELEKOMUNIKACE a.s., www.2n.cz
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