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PAMX-125

wheelock PAMX-125 INSTALLATION INSTRUCTIONS

273 Branchport Avenue Long Branch, N.J. 07740
(732) 222-6880
GENERAL:
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 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
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.
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.
INSTALLATION INSTRUCTIONS
MODEL PAMX-125
PAGING AMPLIFIER
. IN THE EVENT
. All warnings are printed in bold capital letters.
P83242 C
Sheet 1 of 9
5. SPECIFICATIONS:
Figure 1: Power Connections
Table: 1
Description PAMX-125 Tolerance Comments
1. Power Output at 1KHz
2. Total Harmonic Distortion
3. Outputs 125 Watts at
1% at Full Rated Output at 1KHz
8 Ohms, 25V, 70.7V, 100V
125 Watts RMS
±1dB
±1%
±1dB Do Not Operate at
90-132VAC 50Hz/60Hz
Rated Output
8 Ohms
NO LOAD
Inputs (1) Telephone (4) MIC (3) AUX ------ ------
4. Impedance 600 Ohms 600 Ohms 47K Ohms N/A at 1KHz
5. Sensitivity
6. Frequency Response
7. Signal to Noise Ratio
8. Type of Input
9. Controls
(-18dBM)
100mV
150Hz-15KHz
65dB
Transformer
Isolated/Bal.
4mV
50Hz-20KHz
65dB
Balanced or
Unbalanced
Level Control: (1) TEL/MICS (4) MIC (3) AUX
BASS, TREBLE, MASTER GAIN
175mV
50Hz-20KHz
70dB
Unbalanced
TEL ± 2dB
MIC ± 1.0mV
AUX ± 20%
± 2dB
- 3dB
------
To Produce
Rated
Output
Ref. 1KHz at 1W
-3dB Roll-Off
No "Hum"
-----­Front Panel
LIMITER Select Switch, LO-CUT Switch Front Panel TEL/MIC 5 Select, PRE/POST EQ for LINE OUT Rear Panel
10. Indicators Green LED - Power On Input Peak Indicator, Output Peak Indicator
Front
Panel 11a. Treble Control -12dB to +12dB at 10KHz ± 3dB Ref. 1KHz at 1W 11b. Bass Control +12dB to -12dB at 100Hz ± 3dB Ref. 1KHz at 1W
12. Lo-Cut Switch -6dB at 250Hz ± 2dB -----­ Automatic
13. Limiter for Paging Automatic
14. Mute Operation Outputs from
15. Mixer
Input to Power
16. Amplifier
17. Regulation No Load to Full Output
18. RFI Protection RFI Test: Use CB Transmitter Output
19. Environmental 0 Degrees C-49 Degrees C
20. Input Power 90V-132VAC 50/60Hz Power Factor
± 2dB Output Level Maintained Without
Clipping, Even While Exceeding
Rated Input Level Up to 20dB.
40dB Muting of AUX 1 Output Level
with Nominal Page Input LINE OUT: ≥ 1V at RL = 150 Ohms PATCH OUT: ≥ 1V at RL = 150 Ohms
TAPE OUT: -10dB from PATCH OUT
≥ 1V, into 10k Ohms Isolated ≥ 1500V
Less than 2dB
in Same Room - Minimum 20 Ft. from
Amplifier - No Pickup.
85% R.H. Noncondensing
± 1dB
------
± 20%
Input from Mixer
to Amplifier
Output While Page
LINE OUT Selectable
PATCH OUT = PRE-EQ
Gain Control On
------ Amp
------
------
Corrected
------
Mute of Music
is Activated
PRE/POST-EQ
Input
Stability
------
------
------
21. Consumption 175 Watts Max ------ ------
22. Weight 18.5 lbs. ------ ------
23. Dimensions 3.5"(H) 17"(W) 14"(D) ------ Rack Mount 19"(W)
24. FCC Part 15 ------ ------
25. UL 813 ------ ------
26. CSA (Pending)
CAN/CSA C22.2 No. 1-M-90
------ ------
P83242 C
Sheet 2 of 9
6. TELEPHONE PAGING INPUT (SEE FIGURE 2):
Connect telephone paging interface wires to the input screw terminals marked TIP (+) and RING (-). Set MIC 5/TEL switch (rear panel) to TEL
position. For Tip and Ring connections to various types of telephone paging access, see Figures 6A, B & C. For Tip and Ring connections to Wheelock Zone Controls, refer to the specific zone control installation instructions.
7. MICROPHONE INPUTS (SEE FIGURE 2):
(A) Connect balanced low-impedance microphone wires to the input screw terminals marked (+) and (-). The shield must be connected to
the GND screw terminal.
(B) An unbalanced microphone may be connected to the same screw terminals; the signal to (+) and the shield to (-). The (-) input
terminal must be connected to the adjacent screw terminal marked GND. Install a jumper wire between the unused screw terminal and the GND screw terminal.
Note: To avoid possible interference, the microphone input cable should be a shielded cable, with the shield connected to the input GND terminal.
Figure 2: Input Connections
8. AUXILIARY INPUTS (SEE FIGURE 2):
To connect an FM tuner, CD player, tape player, tone generator, or any other line level program source to AUX 1, 2 or 3 input jack on the rear
panel, use a single conductor shielded cable terminated in a standard RCA type phono plug. Note that AUX 1 is automatically soft muted by any active MIC or TEL input. Neither AUX 2 nor AUX 3 is muted by paging inputs. The LIMITER circuit does not affect any of the AUX inputs.
9. LINE OUT (SEE FIGURE 2):
The LINE OUT is the mixed audio signal which can be selected either before the TREBLE/BASS controls (PRE-EQ), or after TREBLE/BASS
controls (POST-EQ). The LINE OUT (PRE-EQ/POST-EQ) select is on the rear of the unit adjacent to the LINE OUT phono jack. The LINE OUT signal is pre-master and is unaffected by changes in the MASTER gain control.
10. PATCH OUT - PATCH IN AND TAPE OUT (SEE FIGURE 2):
The PATCH OUT signal is the mixed audio signal before the TREBLE/BASS and MASTER gain controls to the amplifier. The TAPE OUT signal is
the same as the PATCH OUT but reduced 10dB for line matching to various recording formats. The PATCH OUT signal is available for external audio processing, for example, an outboard 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 processed audio to be applied at PATCH IN. When using external audio processing, the TREBLE/BASS controls should be set to the center or balanced position.
Note: The insertion of a phono plug in either the PATCH OUT or PATCH IN phono jack will disconnect the internal mixed audio from the TREBLE/BASS and the MASTER gain controls.
P83242 C
Sheet 3 of 9
OUTPUT CONNECTIONS (SEE FIGURE 3):
11. AUDIO OUT:
Connect (2) output wires from the speaker load, to the COM screw terminal and the selected constant voltage terminal, (i.e. 25V, 70.7V or 100V).
The constant voltage distribution method facilitates the use of multiple speakers in parallel with a single amplifier. Note that each speaker must have its own 25V, 70.7V or 100V line-matching transformer. Select the wattage tap on the line matching transformer of each speaker, for the power (gain) desired. An 8 Ohm speaker load may be connected to the COM and the 8 Ohm terminals. The audio output is available at the rated output of 125 Watt for an 8 Ohm load, for a 25V, 70.7V or 100V. The GND and COM terminals of the AUDIO OUT terminal block are chassis ground. The shield of audio output shielded cable should be terminated to this GND (if applicable).
Note: The wattage rating of the speaker loads should not exceed total power rating of the amplifier. The following Table 2 below will provide the appropriate line loss that should be calculated on to those expected speaker loads.
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