wheelock PA-500, PA-250 INSTALLATION INSTRUCTIONS

273 Branchport Avenue
Long Branch, N.J. 07740

[phone]

INSTALLATION INSTRUCTIONS

MODEL PA-250 AND PA-500

BOOSTER AMPLIFIER

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

TECHNICIAN OR RETURN UNIT TO FACTORY.

. IN THE EVENT THE AMPLIFIER DOES NOT POWER UP, HAVE THE TROUBLE INVESTIGATED BY AN AUTHORIZED SERVICE

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.

Figure 1: Power Connections

P83243 C

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5. SPECIFICATIONS:

Table: 1

Description PA-250 PA-500 Tolerance Comments

1. Power Output
at 1KHz

2. Total Harmonic
Distortion

250 Watts RMS

3. Outputs 250 Watts 500 Watts

1% at Full Rated Output at 1KHz

500 Watts RMS

8 Ohms, 25V, 70.7V, 100V

±1dB

±1%

±1dB

90-132VAC
50Hz/60Hz

Rated Output

at 1KHz at 8 Ohms

------

Inputs Line In ------ Isolated to 1500V

4. Impedance 10K Ohms ------ at 1KHz

5. Sensitivity

6. Frequency
Response

7. Signal to Noise
Ratio

1V

50Hz-20KHz

75dB

Line ±20%

±2dB

-3dB

To Produce

Rated Output

Ref. 1KHz at 1W

-3dB Roll-Off
No "Hum"

Not Weighted

8. Type of Input Unbalanced (10K Ohms) ------ -----­ 9 Booster Out Buffered Line In (150 Ohms Z

10. Controls Volume Control Front Panel

11. Indicators Green LED - Power On

12. Regulation No Load to Full Output

13. RFI Protection RFI Test: Use CB Transmitter Output
in Same Room - Minimum 20 Ft. from

Less than 2dB

Amplifier - No Pickup.

Output Peak Indicator

14. Input Power 90V-132VAC 50/60Hz Power Factor

15. Consumption 350 Watts 700 Watts

16. Environmental 0 Degrees C-49 Degrees C

85% R.H. Noncondensing

17. Weight 21.1 25.2 lbs.

) Phono Jack

out

------ Amp

Do Not Operate with

NO LOAD

Front Panel

Stability

Amp

Stability

------

Corrected

------ ------

------

------ ------

------

18. Dimensions 3.5"(H) 17"(W) 14"(D) ------ Rack Mount 19"(W)

19. FCC Part 15

20. UL 813

21. CSA (Pending) CAN/CSA C22.2 No. 1-M-90

------ ------

------ ------

------ ------

INPUT CONNECTIONS:

6. LINE IN (SEE FIGURE 2):

Connect line level audio source (i.e. MIC/LINE mixer) to the LINE IN phono jack. For balanced line level

source, connect to 600 OHM terminal

block. Note: The 600 OHM from the terminal block is disconnected when a phone plug is inserted in the LINE IN phono jack.

7. 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.

OUTPUT CONNECTIONS (FIGURE 3):

Figure 2: Input Connections for PA-250 and PA-500

P83243 C

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