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Wheelock PA-250 Installation Instructions Manual

Booster amplifier
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273 Branchport Avenue
Long Branch, N.J. 07740
(908) 222-6880
GENERAL:
The Series PA-250 and PA-500 Watt Booster Amplifiers are designed to be driven from a line-level preamplifier source, (i.e. Series MX-8 Mixer or the
line output of any Wheelock paging amplifier). The PA-250 and 500 offers a choice of two different inputs, one low impedance balanced 600 Ohm input
and one high impedance unbalanced LINE IN input. Use of the LINE IN will automatically disconnect the balanced input. The input is buffered and
available at the BOOSTER OUT.
The amplifier features a VOLUME control and an OUTPUT PEAK indicator for the amplifier on the front panel. On the rear panel there is a power
ON/OFF switch with a switched auxiliary AC receptacle.
All inputs and outputs are connected at the rear panel. Screw terminals are used for the 600 Ohm input (see Figure 2). Phono jacks are used as input
and output for LINE IN and BOOSTER OUT (see Figure 2). The audio power output is connected via screw terminals (see Figure 3).
The amplifier operates from 115VAC, 60Hz and has a power consumption of 350 Watts and 700 Watts respectively. 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 amplifier is provided with five mounting feet for placement on a shelf and comes equipped with a Rack Mount Kit (PA-RMK) for mounting in
standard EIA 19" racks. Refer to Figure 7 for mounting instructions.
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.
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.
Copyright 1996 Wheelock, Inc. All rights reserved.
INSTALLATION INSTRUCTIONS
MODEL PA-250 AND PA-500
BOOSTER AMPLIFIER
Figure 1: Power Connections
P83243 C
Sheet 1 of 6

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Summary of Contents for Wheelock PA-250

  • Page 1 The Series PA-250 and PA-500 Watt Booster Amplifiers are designed to be driven from a line-level preamplifier source, (i.e. Series MX-8 Mixer or the line output of any Wheelock paging amplifier). The PA-250 and 500 offers a choice of two different inputs, one low impedance balanced 600 Ohm input and one high impedance unbalanced LINE IN input.

  • Page 2: Specifications

    BOOSTER OUT (SEE FIGURE 2): The BOOSTER OUT signal allows for cascading amplifiers. The BOOSTER OUT is the LINE IN signal buffered and available at the BOOSTER OUT phono jack. Figure 2: Input Connections for PA-250 and PA-500 OUTPUT CONNECTIONS (FIGURE 3): P83243 C...
  • Page 3 1) For 25V line divide all 70.7V lengths by 8. 2) For 100V line multiply all 70.7V lengths by 2.0. 3) To allow for future expansion and distribution cable line loss, it is recommended that the total system wattage should not exceed 85% of the amplifier’s rated output. (i.e. 212 and 425 Watts for the PA-250 and PA-500 respectively).

  • Page 4: Operation

    AUDIO OUT OUTPUTS: The audio output is available at the rated output of 250 Watts (PA-250) or 500 Watts (PA-500) 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 the audio shielded cable is to be terminated to this GND.

  • Page 5: 18. Troubleshooting

    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. LINE LEVEL IN/OUT: LINE IN is a high impedance line level input into phono jack;...

  • Page 6: Limitation Of Liability

    (as determined by date code). Correction of defects by repair or replacement shall be at Wheelock's sole discretion and shall constitute fulfillment of all obligations under this warranty.

This manual is also suitable for:

Pa-500

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