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P81537 G 

Sheet 1 of 5 

 

273 Branchport Avenue 
Long 

Branch, 

NJ 

 

07740 

         

 

Thank you for using our products. 

(800) 

 

631-2148            

 INSTALLATION 

INSTRUCTIONS 

www.wheelockinc.com 

         

 

 

 

 

PREAMPLIFIER 

MODULE 

Use this product according to this instruction manual.  Please keep this instruction manual for future reference. 

 
MODEL NUMBER:  PRM-150 

 

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's Inc. 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. 
 

GENERAL: 

 

READ THESE INSTRUCTIONS CAREFULLY BEFORE USING THIS PRODUCT. 

 

NOTE:

  All 

CAUTIONS

 and 

WARNINGS

 are identified by the symbol

 

.  All warnings are printed in bold capital letters. 

 

The PRM-150 is designed to amplify levels from an audio source and provide the output to drive up to 150 speaker amplifiers.  It is 
also designed to boost audio levels to compensate for signal lost on long cable runs.  When the volume control knob is set at 5 the 
output signal level is equal to the input signal level. 

 

CAUTION:  

These devices are not intended for use in hazardous locations as defined by the National Electrical Code (NEC) and 

by the National Fire Protection Association (NFPA). 
 

PRM-150

OUTPUT TO
SPEAKER AMPLIFIERS
(4 OHM)

INPUT FROM AN
AUDIO SOURCE
(600 OHM)

GND  -24V

T

R

R

T

0

1

2

3

4

5

6

7

8

9

10

 

 

Figure 1:  Simplified Connections 

 

Copyright 2002 Wheelock, Inc.  All rights reserved. 

Summary of Contents for PRM-150

Page 1: ...ities 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 s Inc publis...

Page 2: ...1 ZONE 3 R T Figure 3 One way paging with a Wheelock ZC 3 Zone Control When connecting over 10 amplified speakers to the ZC 3 it may be necessary to connect Wheelock PRM 150 line preamplifiers to the zone outputs Depending upon system configuration i e quantity of speakers length of wire runs and audio output level of the host telephone system it may also be necessary to use PRM 150 s with less th...

Page 3: ...ms SPECIFICATIONS Table 1 Nominal Input Voltage 24VDC Input Voltage Range 18VDC to 28VDC Maximum Input Current at 24VDC 35mA Audio Input Level T IN and R IN 15dBM 0 1V RMS TO 10dBM 2 4V RMS Input Impedance 600 Ohms Output Impedance 4 Ohms Output Gain T OUT and R OUT 0 to 15dBM Maximum into 4 Ohm Load Output Drive Capability 150 Speaker Amplifiers Maximum Frequency Response 70Hz to 14kHz INSTALLATI...

Page 4: ...er Amplifier volume controls as required TROUBLE SHOOTING CONDITION CHECK 1 No audio output to Speaker Amplifiers 1 Volume control turned up clockwise 2 Check presence and polarity of 24VDC and GND 3 Check audio presence and level on T OUT and R OUT at PRM 150 and if necessary also at the Speaker Amplifiers 4 Check audio presence and level on T IN and R IN at PRM 150 and if necessary at the audio ...

Page 5: ...DAMAGE RESULTING FROM MISAPPLICATION IMPROPER SPECIFICATION ABUSE ACCIDENT OR OTHER OPERATING CONDITIONS BEYOND WHEELOCK S CONTROL WHEELOCK DOES NOT WARRANT THAT THE OPERATION OF THE SOFTWARE WILL BE UNINTERRUPTED OR ERROR FREE OR THAT THE SOFTWARE WILL MEET ANY OTHER STANDARD OF PERFORMANCE OR THAT THE FUNCTIONS OR PERFORMANCE OF THE SOFTWARE WILL MEET THE USER S REQUIREMENTS WHEELOCK SHALL NOT B...

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