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6
Fig 2.2a
2.2 Configuring the speaker lines for monitoring.
As mentioned in section 2.1 all the speaker lines must be of the 100V type, with all speakers fitted with a 22uF Bipolar
capacitor and all lines terminated with an 100KΩ resistor of at least 0.25W rating. Figures 2.2a - 2.2d illustrate the
requirements for the speaker lines.
With the cover removed
the 22uF Bipolar
capacitor is visible.
Plastic cover to remove
the possibility of shorts
occuring in the
ceiling space.
Transformer power
taps. These are
changeable.
Wire protect terminals.
Provides an easy
Loop In/loop Out
termination.
Heatshrunk power
tap lead.
Speaker line coming
into speaker
termination. (Loop In)
Speaker line going
out of speaker
termination (Loop Out).
End of Line resistor
100KΩ 0.25W.
Speaker line coming
into speaker
termination. (Loop In)
Fig 2.2b
Fig 2.2c
Fig 2.2d
Fig 2.2a shows an Altronics C 2168C
100mm ceiling speaker fitted with the
latest in EWIS requirements.
Fig 2.2b shows the 22uF Bipolar
capacitor visible as the plastic cover has
been removed from the
transformer. The various transformer
power taps are also visible. This model
has wattages ranging from 0.33W
to 5W. If this speaker was wired in
parallel to 99 other speakers, all on the
5W tap, this would give a total of 500
watts for the speaker line which is the
maximum load for a zone on the
A 4567B.
Fig 2.2c shows the Loop In/ Loop Out
wiring configuration required when
wiring up multiple speakers on a line.
Fig 2.2d shows the end of line resistor
fitted to the last speaker in the line.
The value must be 100KΩ with a
power rating of at least 0.25 watts.
