Wheelock SA-70 User manual

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8
273 Branchport Avenue
Long Branch, N.J. 07740 Thank you for using our products.
[phone]
INSTALLATION INSTRUCTIONS
SPEAKER AMPLIFIER
Use this product according to this instruction manual. Please keep this instruction manual for future reference.
MODEL NUMBERS:
SA-70 4" SPEAKER WITH SQUARE, FLUSH GRILLE
SA-90 4" SPEAKER WITH ROUND, FLUSH GRILLE
SA-C8-A 8" SPEAKER WITH ROUND, FLUSH, PLASTIC GRILLE
SA-B4 4" SPEAKER IN A SURFACE MOUNT HOUSING
FCC REGULATIONS:
This equipment complies with Part 68 of the FCC Rules. On the back of this equipment is a label that contains, among other
information, the FCC Registration Number and the Ringer Equivalence Number (REN) for this equipment. You must, upon request
provide this information to your telephone company.
The REN is also useful to determine the quantity of devices that you may connect to your telephone line and still have all of those
devices ring when your telephone number is called. In most, but not all areas, the sum of the REN's of all devices connected to one
line should not exceed five (5.0). To be certain of the number of devices that you may connect to your line, you may want to contact
your local telephone company.
Should the equipment cause harm to the telephone network, the telephone company shall, if possible, notify the customer that
temporary discontinuance of service may be required; however, where prior written notice is not possible, the telephone company
may temporarily discontinue service without notice, if such action is necessary under the circumstances. The telephone company may
make changes in its communication facilities, equipment and operations procedures, where such action is reasonably required in the
operation of its business and is not inconsistent with the rules and regulations of the Federal Communications Commission.
Do not attempt to repair or modify this equipment. Repairs to this product will be performed by Wheelock Inc. 273 Branchport Ave,
Long Branch, NJ 07740 in accordance with Wheelock Inc.'s published Terms and Conditions of Sale. This equipment should not be
used on coin telephone lines. Connection to party line service is subject to state tariffs.
If trouble is experienced, disconnect this equipment from the telephone line to determine if it is causing the malfunction. If the
equipment is determined to be malfunctioning, its use shall be discontinued until the problem has been corrected.
NOTE: All CAUTIONS and WARNINGS are identified by the symbol .All warnings are printed in bold capital letters.
WARNING: READ THESE INSTRUCTIONS CAREFULLY. FAILURE TO COMPLY WITH ANY OF THE
FOLLOWING INSTRUCTIONS, CAUTIONS AND WARNINGS COULD RESULT IN IMPROPER APPLICATION,
INSTALLATION AND/OR OPERATION OF THESE PRODUCTS IN AN EMERGENCY SITUATION, WHICH COULD
RESULT IN PROPERTY DAMAGE AND SERIOUS INJURY OR DEATH TO YOU AND/OR OTHERS.
Copyright 1987-1994, 1997 Wheelock, Inc. All rights reserved.
APPLICATION INFORMATION:

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The Speaker Amplifiers are used in the following manner. Figure 1 shows a zone paging application used with Wheelock's Zone
Page Control Module. The Speaker Amplifier can also be used to provide single-zone paging when connected directly to an unused
C.O. line port, which can be programmed to function as a 600 OHM Audio Page Port. (i.e,. does not require Talk Battery). See
Figure 2.
Figure 1. Figure 2.
(See Note 2 below)
NOTES
1. Some telephone systems require that the C.O. trunk port (loop start) or C.O. line port be equipped with a trunk card, page
card or other equipment. Consult the telephone manufactures system manual for equipment or programming required.
2. If unused C.O. port requires talk battery to pass audio (most do), then a Wheelock Zone Control is required as an interface
for Zoned Paging Systems. For Single-Zone Paging a Wheelock PRM-150 Preamplifier with an RPS-2406 Power Supply is
required as an interface.
Figure 3 shows a speaker amplifier connected to a tone generator for telephone alerting or night ringing, with paging.
Figure 3.
Figure 4 shows the same tone generator and speaker amplifier activated by a common audible.
Figure 4.
The speaker amplifier can be used to amplify the tone of a telephone as shown in Figure 5. It can also be used to expand the
capability of 25 or 70 volt paging systems. Up to 125 speaker amplifiers may be connected to each transformer using the 1/4W tap.
See Figures 6 & 6A.
Figure 5.
Figure 6.
NOTE
If unused C.O. port requires talk battery, to pass
audio (most do), then a Wheelock Zone Control is
required as an interface.
NOTE
If unused C.O. port requires talk battery, to pass
audio (most do), then a Wheelock Zone Control is
required as an interface.

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Figure 6A.
Figure 7 shows speaker amplifiers connected to a PABX or EKSU which provides one or more audio page ports.
Figure 7.
(A) 8 OHM, Amplified (1-3 Watts) page port: Maximum capacity is 125 speaker amplifiers.
(B) 600 OHM, low power page port: Maximum capacity is 10 speaker amplifiers (See
System Capacity below). If a PRM-150 preamplifier is used, then maximum capacity is
150 speaker amplifiers.
SYSTEM CAPACITY:

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In each application (except Figures 6, 6A and 7), a maximum of 10 speaker amplifiers may be used, based upon a minimum audio
input signal of -15dBM (0.1VRMS) at each speaker amplifier to obtain rated power output. Depending upon the paging system's
configuration, and the available audio output signal from the host telephone system, the audio input signal may be less. If additional
volume is required, use the Wheelock PRM-150 Preamplifier. Applications with up to 150 speaker amplifiers also require the PRM-
150 Preamplifier.
SPECIFICATIONS:
Speaker-
Cone Diameter: 4" (Models SA-70, SA-90 & SA-B4)
8" (Model SA-C8-A)
Voice Coil Impedance: 45 Ohms
Sound Pressure Level SA-70, SA-90, SA-B4 SA-C8-A
(On Axis, @ 1W, @ 1KHz): 1M. - 95 98
4FT. - 93 96
10FT. - 85 88
Amplifier-
Signal Input Impedance: 600 Ohms
Signal Input Level: -15 dBM (@ 0.1Vrms) to +10 dBM (2.4Vrms)
Nominal Power Input Voltage: 24VDC (18VDC minimum; 28VDC maximum)
Nominal Input Current: 45 mA (@ 24VDC)
Maximum Input Current: 170 mA (@24VDC)
Power Output Rating: 1.0 Watt
Terminals-
4 Screw Terminal Clamps
INSTALLATION INFORMATION:
A. SA-C8-A, SA-70, and SA-90 Ceiling Mount Speakers
Ceiling mounted speakers should be spaced at a distance equal to twice the ceiling height. Because of their cone shaped sound
projection (dispersion), ceiling speakers cover more area as the ceiling height increases. These factors are illustrated in Tables 1, 2,
and Figure 8.
Table 1:
Ceiling Speaker Spacing And Coverage
Coverage
Ceiling Speaker per speaker
Height (ft.) Spacing (ft.) (square ft.)
8 16 250
10 20 400
12 24 575
Table 2:
Speaker Coverage In Square Feet

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Ceiling Height (Feet)
No. Of
Speakers 8 9 10 11 12
1 250 325 400 485 575
2 500 650 800 970 1,150
3 750 975 1,200 1,450 2,300
4 1,000 1,300 1,600 1,930 2,875
5 1,250 1,625 2,000 2,410 3,450
6 1,500 1,950 2,400 2,890 4,025
7 1,750 2,275 2,800 3,370 4,600
8 2,000 2,600 3,200 3,850 5,175
9 2,250 2,925 3,600 4,330 5,750
10 2,500 3,250 4,000 4,810 6,325
Figure 8.
Ceiling Speaker Spacing And Coverage
Note that increasing volume results in the speaker being louder in its covered area, but does not increase the area covered by the
speaker.
The design goal of speaker placement is to allow people to hear just about the same volume from anywhere in the room. The goal is
accomplished with a symmetrical layout of the ceiling speakers which achieves edge-to-edge area coverage, as shown in Figure 9.
Figure 9.
Typical Ceiling Speaker Layout
B. SA-B4 Surface Wall Mount Speakers:
Surface wall mounted speakers are used where it is not practical to mount ceiling speakers. Forward sound projection and spacing are
important, and Table 3 provides a guide line.