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Figure 2 - Room Speakers with Voice Call-In Switch, Connection Diagram
or for surface mounting in a standard deep single-gang
wire mold outlet box. Install the box in a location which
provides convenient access to both the switch and the
room speaker.
LINEMATCHING TRANSFORMERS
The installation diagrams show Bogen line-matching
transformers of ¼ or %-watt capacity (Models TS-025
or TS-05). Other recommended transformers are shown
in figure 3. The console output is designed for a 25-volt
constant voltage distribution system and all system
loudspeakers must be provided with line-matching
transformers.
CAUTION
Speakers and transformers must be proper-
ly matched with respect to power require-
men ts.
CONSOLETTE WIRING
Remove the Phillips-head screws securing the
louvered pane1 on the rear of the consolette (or console).
There are three rows of solder terminals across the rear
of each switchbank. Each selector switch corresponds
to the three terminals directly behind it, one terminal
from each row.
White tabs are provided for identifying the room con-
trolled by each selector switch. Insert the tabs in the
slots provided in the transparent switch knobs. When
rooms are identified by number, it is common practice
to start numbering the switches from left to right (view-
ing from the front or operator position), starting with
the top switchbank.
L I N E
7 4 - 2 5 8 8 - A
SWITCHBANK WIRING
Wire the switchbanks as shown in figure 4. If annun-
ciator lamps are used (Model SBL), always solder the
single annunciator wire to the top solder terminal. For
all switch banks, solder the speaker lines to the center
and bottom terminals, with the shield to the ground bus
This is the only place where speaker shields should
bar.
be grounded.
VOICE CALL-IN OPTION
Figure 2 shows the room connections and switch re-
quired for installing an optional voice call-in system.
The wiring must be completed by connecting the
shielded pair from the switch to the terminal strip on the
rear of the MCT-1 chassis. The polarity of the inner
conductors is not critical, but make certain to connect
the cable shield to the shield of the cable already con-
nected to the terminal strip.
Note that only one cable goes to the terminal strip.
Usually, the cables from all room switches are con-
nected by a common control cable and one cable is run
to the consolette. If this type of installation is not prac-
tical, then the control cables for two or more switches
are run to the consolette. In this case, connect all the
cables in parallel in a junction box at the consolette and
run a single control cable from the junction box to the
terminal strip on the MCT-1 chassis.
CALL/PRIVACY OPTION
Figure lc shows the room connections and switch re-
quired for installing an optional annunciator/privacy
function in the intercom system.
4-
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