Code 3 MasterCom B Series - Manual (Page 6)

6
CONNECTION OF A 58 WATT SPEAKER TO THE SPKR TERMINAL WILL CAUSE THE
SPEAKER TO BURN OUT, AND WILL VOID THE SPEAKER WARRANTY!
The sound projecting opening should be pointed forward, parallel to the ground, and not
obstructed or muffled by structural components of the vehicle. Concealed or under-hood
mountings in some cases will result in a dramatic reduction in performance. To minimize
this reduction, mount the speaker so the sound emitted is projected directly forward and
obstruction by vehicle components such as hoses, brackets, grille, etc. is minimized.
Electromechanical sirens and electronic siren speakers should be mounted as far from the
occupants as possible using acoustically insulated compartments and isolation mountings to
minimize the transmission of sound into the vehicle. It may be helpful to mount the device
on the front bumper, engine cowl or fender; heavily insulate the passenger compartment; and
operate the siren only with the windows closed. Each of these approaches may cause
significant operational problems, including loss of siren performance from road slush, increased
likelihood of damage to the siren in minor collisions, and the inability to hear the sirens on ot
her emergency vehicles.
APPROPRIATE TRAINING OF VEHICLE OPERATORS IS RECOMMENDED TO ALERT
THEM TOTHESE PROBLEMS AND MINIMIZE THE EFFECT OF THESE PROBLEMS
DURING OPERATIONS.
Terminal Block Connections
10 Position Terminal Plug- ( see wiring diagram page 20 )
COM - Connect to the terminal marked "1" of one 100 W ( 11 ohm ) speaker.
SPKR - Connect to the terminal marked "2" of the 100 W ( 11 ohm ) speaker..
NOTE: An optional 200 W version is available. This will enable the user to connect two 100 W
speakers in parallel. Correct phasing is important and can be accomplished by connecting both
speaker terminals marked " 1 " to the COM terminal and both speaker terminals marked " 2" to the
SPKR terminal.
REMOTE - Remote switch (Horn ring or foot switch). Circuit can be configured for both ground
(earth) or positive signals. A horn ring transfer circuit is standard in all 3940 series "L" models.
Connect to the "REMOTE" terminal on the Lighting Control Section terminal block. Unit is
configured for a ground ( earth ) at the factory. See page 7 for details on configuring for a +12V
input.
BLTG- Provides +12V to siren backlighting. Connect to a vehicle circuit that is powered when the
ignition switch is " on ". If backlighting dimming is desired, connect to the dash lights' circuit.
Caution- If connected to the battery the backlighting will be active at all times.
PKILL- This feature automatically deactivates siren tones when the vehicle is shifted into PARK.
On models with lighting control Level 3 will " drop-out " if this feature is enabled via the rear panel
dip switch. Siren tones will be disabled until the vehicle is shifted out of PARK and the front panel
selector switched is either returned to standby ( or another function is selected ) or the lighting
level control is returned to level 1.
This circuit is activated by a negative signal. Connect this input to a circuit that is GROUNDED
(Earth) when the vehicle is shifted into PARK. It is the installer's responsibility to determine an
appropriate location in the vehicle circuitry to connect this wire.
RRB - Connect to one side of the two-way radio speaker.
RRB - Connect to the second side of the two-way radio speaker.
EXPWR - Connect directly to +12V terminal of the battery or a non-ignition switched source of +12V
capable of supplying a minimum of 10 Amps.
WARNING!
!