Honeywell K9696V2 4.1.1Checking for Audio Interference, Preventive measures

Multi-Media Unit: Installation Instructions

Honeywell recommends that speakers be placed away from microphones, to avoid audio feedback.

Fig. 38. Speaking remotely from a PC running View, or onsite using LocalView, an operator can communicate with people at the site.

Use the “[Audio] In” connector. The “Mic In” connector is disabled.

4.1.1Checking for Audio Interference

Preventive measures

Checking one’s installation for hard-to-predict situations includes spot-checking for:

•live audio. Coordinate the testing of audio with fire alarm and security alarm testing. Using View, connect to that Multi-Media unit and check audio for feedback and interference, before and during alarms.

•recorded audio. After a day or two, check for background noise in recordings, using a retrieval session to spot-check each microphone for a few seconds at every half-hour or so, during a 24 hour period. This can reveal if microphones are placed too near sources of background noise such as a vent. Noise is amplified to a point where it interferes with audio. Hard to predict noise from the area’s soundscape—rush-hour traffic, passing trains and planes, crowds in a stadium, and so on—may not have been present during the installation of microphones and speakers.

Loud alarms should be tested during the installation; they can interfere with Multi-Media audio. If microphones and speakers are used while alarm bells are ringing, Honeywell recommends that Multi-Media audio equipment be sonically insulated from the loudness of the alarms.

Placing a microphone or speaker close to a ringing alarm bell can render either ineffective: the bell noise can mask the voice of an operator attempting to use the microphone. The bell could also mask a voice coming from a speaker. Loud alarms can interfere with microphones or a speaker when they could be needed most.

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