Connecting Signal Lines; Connecting To Remote Devices; Balanced Line Application; Figure 2 Connections On The Back Of Model 300Mb - Federal Signal Corporation D1 Series Installation And Maintenance Manual

Connecting Signal Lines

See Figure 2. To connect the signal lines of the SelecTone system to the 300MB, connect a color-
coded, twisted pair of audio cables with conductors no smaller than 18 AWG to the TB1-13 and TB1-
14 terminals on TB1. Before using TB1-13 and TB1-14, remove the labeled jumper. Every remote
SelecTone signaling device in the system can be connected in parallel or series to these lines.
For non-SelecTone 25 Vrms speakers, such as ceiling speakers, connect the signal lines directly to TB1-13
and TB1-14 of terminal block TB1. Before using TB1-13 and TB1-14, remove the labeled jumper. Signal
line losses must be considered when calculating how many speakers can be connected to the 300MB.
120/240 Vac
CLASS I FIELD WIRING
COMPARTMENT

Connecting to Remote Devices

Physically install the remote SelecTone device(s) following the instructions included with the device.

Balanced Line Application

See Figure 3 on page 12. For 300GC, 300GCX, 300X, 302GC, 302GCX, 302X or 50GC speakers, an
AM25CK Connector Kit is required for connection to the balanced signal output of the 300MB. The
AM25CK properly terminates the balanced signal lines to the amplifier in the 300GC, 300GCX, 300X,
302GC, 302GCX, 302X and 50GC. Remove the labeled jumper from terminals TB1-13 and TB1-14
of terminal block TB1. As shown in Figure 3, connect the white input wires on the AM25CK to the
terminals TB1-13 and TB1-14 of terminal block TB1 on the 300MB. The AM25CK and AM70CK
Connector Kits are NOT polarity sensitive, but polarity must be observed when placing speakers in close
proximity to each other.
CROSSTALK INTERFERENCE — Mixing signal lines with power lines could
cause electrical interference, which could impede or render the system
inoperable. Do not install signal lines in the same conduit with power lines.
SHOCK HAZARD — Do not install signal lines in the same conduit with power
lines. Avoid routing signal lines on cable trays with high voltage power lines.

Figure 2 Connections on the back of Model 300MB

TB2
10 9 8 7 6 5 4 3 2 1
MODEL 300MB REAR VIEW
(BACK OF HOUSING IS REMOVED FOR CLARITY)
Model 300MB-SD CommCenter Series D1
Installation and Maintenance Manual
KNOCK-OUTS IN
REAR OF HOUSING
17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
TB1
CLASS II FIELD WIRING
COMPARTMENT
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