SECTION X - TWO-TONE SYSTEMS
For Models 280K & 480K
REQUIRED EQUIPMENT
1. Control Unit - Any existing 280K or 480K
control unit can be used. No modifications or
additional switches are required.
2. Amplifiers - Two amplifiers, each housed in a
separate cabinet, are required.
3. Cables - A UMCO30T cable is needed for
interconnecting the two amplifiers. UMCO30K
(4’ or 15’ long) is needed for interconnecting
both amplifiers with the control unit.
4. Siren Speakers - At least one speaker must be
used with each amplifier. Two speakers may be
used as indicated by dotted lines in drawing.
Note: A speaker having one horn, but two driver
units (such as a 200 watt speaker), is electrically
the same as two speakers.
AMPLIFIER INSTALLATION
1. Install first amplifier as indicated in drawing.
2. Set slide switch on bottom of amplifier
chassis to match power rating of speakers
to be used.
3. Install amplifier with 4 inches maximum
between cabinets.
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PRELIMINARY CONNECTIONS
1. Interconnect AIR HORN wires from both 3 - pin
amplifier connectors using the appropriate
connector.
2. Intrusion Alarm - See Section VIII.
3. Connect one terminal (either one) of one siren
speaker to vehicle chassis (-). Connect same number
terminal of remaining speakers to vehicle chassis(-).
4. Of the two SIREN SPEAKER wires coming
from the 12-pin control unit pigtail connector,
connect either one to vehicle chassis (-), and the
other to the speaker.
FINAL CONNECTIONS
a) see drawings.
1. The RED primary wire from the added amplifier
must connect directly to the positive (+) battery post
or to an appropriate power distribution terminal.
2. It is vitally important for proper siren operation
that a 12-ga (minimum) “jumper” be placed across the
RED primary wires of each amplifier as indicated.
