Wheelock PA-250 Installation Instructions Manual

273 Branchport Avenue Long Branch, N.J. 07740 (908) 222-6880 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 ...

5. SPECIFICATIONS: Table: 1 Description PA-250 PA-500 Tolerance Comments 1. Power Output at 1KHz 250 Watts RMS 500 Watts RMS ±1dB 90-132VAC 50Hz/60Hz 2. Total Harmonic Distortion 1% at Full Rated Output at 1KHz ±1% Rated Output at 1KHz at 8 Ohms 3. Outputs 250 Watts 500 Watts 8 Ohms, 25V, 70.7V, 100V ±1dB ------ Inputs Line In ------ Isolated to 1500V 4. Impedance 10K Ohms ------ at 1KHz 5. Sensitivity 1V Line ±20% To Produce Rated Output 6. Frequency Response 50Hz-20KHz ±2dB Ref. 1KHz at 1W -3dB Roll-Off 7. Signal to Noise Ratio 75dB -3dB No "Hum" Not Weighted 8. Type of Input Unbalanced (10K Ohms) ------ ...

8. AUDIO OUT (SEE FIGURE 3): 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 (volume) 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 250 or 500 Watts for a ...

Figure 4: Cascading Amplifiers Note: Use shielded cable for all interconnections. OPERATION: WARNING: DO NOT OPEN COVER! NO USER SERVICEABLE INTERNAL COMPONENTS! REFER TO QUALIFIED SERVICE TECHNICIAN. IF UNIT IS OPENED, WARRANTY IS VOIDED. Figure 5: PA-250 or PA-500 Front Panel 11. POWER INDICATOR: Green LED indicator illuminates when AC power is applied to the amplifier. 12. VOLUME CONTROL: Adjusts the total output level of the amplifier. 13. OUTPUT PEAK INDICATOR: The indicator, as the amplifier output is increased, illuminates within 2dB of full rated output. Figure 6: PA-250 or PA-500 Rear Panel 14. POWER ON/OFF SWITC ...

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. 16. LINE LEVEL IN/OUT: LINE IN is a high impedance line level input into phono jack; 600 Ohm is a balanced screw terminal input. When a phono plug is inserted into the LINE IN phono jack the balanced input is disconnected. The BOOSTER OUT is the LINE IN signal buffered and available at a phono jack. 17. RACK MOUNT ATTACHMENT: 1. Mounting hardware for the PA-RMK is supplied. (2) Handle Bra ...

Limited Warranty Wheelock products must be used within their published specifications and must be PROPERLY specified, applied, installed, operated, maintained and operationally tested in accordance with these instructions at the time of installation and at least twice a year or more often and in accordance with local, state and federal codes, regulations and laws. Specification, application, installation, operation, maintenance and testing must be performed by qualified personnel for proper operation in accordance with all of the latest National Fire Protection Association (NFPA), Underwriters' Laboratories (UL), Underwriters’ ...