981-251-100 for general information on loudspeaker
paging system.
Caution: A void placing loudspeakers
dir�ctly in front of or close to stations
tha t will u tilize the paging system.
An undesirable oscilla tion (sq u eal)
can result from such speaker placement.
A minim um separation of 60 fee t
between telephone sets and loudspeakers
is recommended.
The problem can
also be reduced by using a 456B
voice and tone alerting circuit KTU
instead of a 456A.
4.48
The system is factory-wired so paging may
be activated by dialing code 2.
ISS 3, SECTION 5 1 8-450-1 00
4.49
Make connections as follows:
(1) Install 457C KTU in J15. See Fig. 42 for
KTU location.
(2) If background music is provided, install the
33A voice coupler according to 4.38(b).
(3) Connect paging speakers as shown in Fig.
43. Speaker wiring should be run separately
and not a part of a voice cable. Quad inside
wire should be used with both pairs connected.
(Where it may become necessary to "stack" wires
on the connecting block terminals, use 183B2
adapters.) Speakers connected in this manner
can be located a maximum of 320 feet from the
NOTES:
1 . EXAMPLES A, B AND C ARE FOR QUIET OR OFFICE
TYPE ENV I ROMENTS, LESS THAN
6500
SOUND
PRESSURE LEVEL (SPL) . ALL SPEAKERS SHOULD BE
LOCATED AT LEAST 60 FEET FROM
AtfY
STAT ION
USED FOR PAG ING.
EXAMPLE A
-
SPEAKERS LOCATED ON ON£ WALL OF ROOM (NOTES I , 2 AND 3)
2 .
SPEAKER W I R I NG SHOULD BE RUN SEPARATELY,
60'-:J:k---30'-+1
1--
60'
NOT PART OF A VOICE CABLE. QUAD CABLE
SHOULD BE USED WITH BOTH PAIRS CONNECTED.
SPEAKERS SHOULD BE HUNG
AS
CLOSE TO THE
CE I L I NG AS POSS IBLE. MAX I MUM SPEAKER DI STANCE
FROM THE KSU IS
l20
FEET US I NG QUAD WIRE.
l .
SPEAKERS REACH A DEPTH OF lO FT. I F ROOM IS
OVER lO FT. W I DE, FAC ING SPEAKERS SHOULD
BE USED.
4. ONE SPEAKER W I LL SERVE A ROOM UP TO
25 FT.
BY
25 FT.
EXAMPLE
B
-
SPEAKERS
LOCATED ON OPPOS I TE WALLS Of ROOM (NOTES
I
AND 2 )
5.
ONE SPEAKER (HORN) MOUNTED
2 0
FT. ABOVE
GROUND LEVEL W I LL COVER AN AREA APPROXI MATELY
BO FT. BY 100
FT.
IF THE HORN IS MOUNTED LESS
THAN
20 FT.
ABOVE GROUND LEVEL, TWO HORNS
MUST BE USED. HORNS SHOULD NOT BE MOUNTED
LESS THAN
15
FT.
ABOVE GROUND LEVEL. IF MORE
THAN ONE HORN IS USED, THEY SHOULD BE MOUNTED
VERT I CALLY, RATHER THAN S I DE-BY-S I DE .
EXAMPLE
C
- SPEAKERS LOCATED I N I ND I V I DUAL ROOMS (NOTES
I ,
2 AND
4 )
EXAMPLE D - OUTS I DE SPEAKER (HORN) LOCAT I ON (NOTES 2 AND 5 )
Fig. 4 1 - Example of Paging Speaker Location
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