Wheelock PAMX-125 Installation Instructions Manual Download Page 1

 

273 Branchport Avenue 
Long Branch, N.J.  07740 

(732)  222-6880 

 

INSTALLATION INSTRUCTIONS 

MODEL PAMX-125 

PAGING AMPLIFIER 

 

GENERAL: 

The PAMX-125 combines an eight channel mixer with a 125 Watt RMS amplifier in a single unit.  The PAMX-125 amplifier offers a choice of ten different 
inputs:  five low impedance microphone inputs, one telephone paging input, three high impedance auxiliary inputs and one PATCH IN  input.  The 
PAMX-125 allows eight of these inputs to be used simultaneously:  four microphone inputs, a choice of a telephone paging input or a fifth microphone 
input, and three auxiliary inputs. 
 
 
The front panel of the amplifier features individual input level controls; as well as, MASTER gain and TREBLE / BASS controls, LO CUT horn protect 
switch,  LIMITER (ALC) ON/OFF switch, power ON indicator, INPUT PEAK indicator for the eight input channels and an OUTPUT PEAK indicator. 
 
 
A built-in LIMITER circuit compensates for the varying voice levels and paging styles of the people who have access to telephone paging or a 
microphone input.  The LIMITER maintains rated output without distortion when input level exceeds rated input by as much a 20dB.  The LIMITER circuit 
affects only the MIC and TEL inputs. 
 
 
Note that (AUX 1) auxiliary input (i.e., background music, tone generator, etc.) will automatically be soft muted whenever a telephone page or a 
microphone page is generated.  After completion of the page, the music will return to its original level. 
 
 
On the rear panel there is a power ON/OFF switch with a switched auxiliary AC receptacle, as well as a MIC 5/TEL select switch and a PRE/POST EQ 
select switch for the LINE OUT (See Figure 7).  All inputs and outputs are connected at rear panel.  Screw terminals are used for the Microphone and 
Telephone Inputs.  Phono jacks are used for Auxiliary Inputs, LINE OUT, TAPE OUT, PATCH OUT and PATCH IN.  The audio power output is 
connected via screw terminals (See Figure 8). 
 
 
The amplifier operates from 115VAC, 60Hz and has a power consumption of 175 Watts.  

There is no external fuse or circuit breaker

.  IN THE EVENT 

THE AMPLIFIER DOES NOT POWER UP, HAVE THE TROUBLE INVESTIGATED BY AN AUTHORIZED SERVICE TECHNICIAN OR RETURN UNIT 
TO FACTORY. 
 
 

NOTE:

 READ THESE INSTRUCTIONS CAREFULLY.  FAILURE TO COMPLY WITH ANY OF THE FOLLOWING INSTRUCTIONS, CAUTIONS AND  

          WARNINGS COULD RESULT IN RISK OF ELECTRICAL SHOCK, IMPROPER APPLICATION OR INSTALLATION.

 

 
 

NOTE:

  All 

CAUTIONS

 and 

WARNINGS

 are identified by the symbol  

.  All warnings are printed in bold capital letters. 

 
 

WARNING:  TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE THIS UNIT TO RAIN OR MOISTURE.

 

 
 

1. UNPACKING: 

 

The amplifier was carefully checked before leaving the factory.  Inspect shipping container and unit carefully for indication of improper handling.  If 
the unit has been damaged, make an immediate claim to the carrier. 

 
 

2. MOUNTING 

INSTRUCTIONS: 

 

The mixer is provided with five mounting feet for placement on a shelf.  An optional Rack Mount Kit (PA-RMK) is available for mounting in standard 
EIA 19” racks.  Refer to PA-RMK installation instructions (P83258) for mounting. 

 

CAUTION:  

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

 

 

3. 

POWER AND GROUNDING (SEE FIGURE 1): 

 

The 115VAC line cord has a three-prong plug which should be plugged into a three wire grounded electric outlet.  It is very important to maintain 
the amplifier ground for safe and trouble-free operation.  If there is no grounded electric outlet, connect a wire from the GND terminal on the 
OUTPUT terminal strip to a water or steam pipe. 

 

P83242 C 

Sheet 1 of 9 

Copyright 1996 Wheelock, Inc.  All rights reserved. 

 

4. 

POWER SWITCH AND RECEPTACLE (SEE FIGURE 1): 

 

The ON/OFF power switch located on the rear panel controls both the internal power of the amplifier and the accessory IEC female outlet. 

 

Note

:  The accessory to be attached and controlled by the ON/OFF switch must not exceed 3 Amps at 115VAC. 

Summary of Contents for PAMX-125

Page 1: ...r output is connected via screw terminals See Figure 8 The amplifier operates from 115VAC 60Hz and has a power consumption of 175 Watts There is no external fuse or circuit breaker IN THE EVENT THE AMPLIFIER DOES NOT POWER UP HAVE THE TROUBLE INVESTIGATED BY AN AUTHORIZED SERVICE TECHNICIAN OR RETURN UNIT TO FACTORY NOTE READ THESE INSTRUCTIONS CAREFULLY FAILURE TO COMPLY WITH ANY OF THE FOLLOWING...

Page 2: ...dB 1dB Automatic 14 Mute Operation 40dB Muting of AUX 1 Output Level with Nominal Page Input Mute of Music Output While Page is Activated Outputs from 15 Mixer LINE OUT 1V at RL 150 Ohms PATCH OUT 1V at RL 150 Ohms TAPE OUT 10dB from PATCH OUT 20 LINE OUT Selectable PRE POST EQ PATCH OUT PRE EQ Input to Power 16 Amplifier 1V into 10k Ohms Isolated 1500V Input from Mixer to Amplifier Gain Control O...

Page 3: ...d graphic equalizer If external audio processing is used the resultant signal is to be returned to the amplifier at PATCH IN The insertion of a phono plug at PATCH IN will replace the internal mixed audio signal with an external audio signal The insertion of an RCA phono plug into the PATCH OUT will also disconnect the mixed audio signal from the tone and gain controls requiring the external proce...

Page 4: ...e line loss it is recommended that the total system wattage should not exceed 85 of the amplifier s rated output i e 106 watts for the PAMX 125 4 The total system wattage requirement is the summation of the wattage tap selections of all system speakers and horns 5 In no case should the wattage rating of the speaker loads exceed the total power rating of the amplifier Figure 3 Output Connections WA...

Page 5: ...uced in level by 10dB Both the PATCH OUT and the TAPE OUT signals are the mixed audio signal prior to the TREBLE BASS and MASTER gain controls Figure 5 Connecting a Tape Recorder CAUTION Do not block air flow Do not stack Do not operate vertically When rack mounting it is necessary to have a minimum of 1 75 above and 1 75 below unit to allow for adequate air flow Failure to do so could result in e...

Page 6: ... settings and adjustments Figure 6C Unused Co Line Trunk Port or Stand Alone Telephone Note Maximum primary DC current not to exceed 10mA for telephone input CAUTION Connect only to PBX or KSU incorporating isolation from public telephone network P83242 C Sheet 6 of 9 OPERATION WARNING DO NOT OPEN COVER NO USER SERVICEABLE INTERNAL COMPONENTS REFER TO QUALIFIED SERVICE TECHNICIAN IF UNIT IS OPENED...

Page 7: ... approaching clipping of the audio signal 20 INPUT PEAK INDICATOR The INPUT PEAK indicator will illuminate as the input of any of the eight audio channels approach clipping If any of the paging inputs approaches clipping activate the LIMITER to allow paging inputs up to 20dB overdrive 21 TREBLE AND BASS CONTROLS Adjusts TREBLE and BASS for optimum tonal balance of the output signal The amplifier f...

Page 8: ...is to be reapplied to the PAMX 125 at the PATCH IN The TAPE OUT is the same signal as the PATCH OUT but is reduced 10dB When an external audio processor is used both the TREBLE and BASS control should be centered Note When a phono plug is placed in either the PATCH OUT or PATCH IN phono jack the mixed audio signal is disconnected before the TREBLE BASS and MASTER gain control The outboard processe...

Page 9: ...SIBLE FOR DETERMINING WHETHER A PRODUCT IS SUITABLE FOR THE USER S PURPOSES OR WHETHER IT WILL ACHIEVE THE USER S INTENDED RESULTS THERE IS NO WARRANTY AGAINST DAMAGE RESULTING FROM MISAPPLICATION IMPROPER SPECIFICATION ABUSE ACCIDENT OR OTHER OPERATING CONDITIONS BEYOND WHEELOCK S CONTROL SOME WHEELOCK PRODUCTS CONTAIN SOFTWARE WITH RESPECT TO THOSE PRODUCTS WHEELOCK DOES NOT WARRANTY THAT THE OP...

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