GAI-Tronics PMA-300 Manuel - Page 7

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Model PMA-300 300 Watt Central Amplifier

Speaker Wiring Guidelines

Cable distance should be kept as short as possible to reduce power loss. The following chart illustrates
the correlation between four typical wire sizes and the distance that speakers with integral drivers or horns
with separate drivers can be placed from the central amplifier for a -1 dB loss (-20% power).
Speaker Wiring Guidelines For 300 Watt Central Amplifiers
Central
Amp Line
18 AWG (0.82mm
Voltage
100 V Line
319 feet (97 m)
70.7 V Line
162 feet (49.3 m)

Installation

WARNING
CAUTION
These installation instructions are for use by qualified service
personnel only. To reduce the risk of electric shock, DO NOT perform any servicing other
than that contained in the operating instructions unless you are qualified to do so.
1.
Ensure that the installation conforms with all applicable local electrical codes.
2.
Avoid running input and output signal cabling near high voltage/high electromagnetic sources.
3. When the SPEAKER OUT voltage connection being used is 100V, the amplifier's Speaker Out
wiring MUST conform to Class 1 wiring specification. When the SPEAKER OUT voltage
connection being used is 70V, Class 2 wiring specification is acceptable.
DANGER
4. Use in safe, non classified, non hazardous areas only
5. The total power distribution to the speakers MUST NOT exceed the amplifier's rated output wattage.
Rack Mount Installation
The power amplifier is designed to be mounted in a standard 19-inch equipment rack ONLY. Place the
amplifier in the desired rack location and secure with appropriate rack mounting hardware
(customer-supplied).
Due to the weight of the unit, supporting rails (customer supplied) mounted inside the equipment rack
MUST be used for adequate support of amplifier; however, do not block the heatsink fans preventing
adequate air circulation. Please refer to the equipment rack manufacturer for the appropriate support rails
to use.
f:\standard ioms - current release\instr. manuals (42004)\42004-667l2a.doc
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2
)
16 AWG (1.31mm
509 feet (155.1 m)
257 feet (78.3 m)
Please follow below recommendations / instructions for installation.
Do not install in a hazardous area.
Wire Size
2
) 14 AWG (2.08mm
810 feet (246.8 m)
409 feet (124.6 m)
.
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Pub.: 42004-667L2A
2
2
) 12 AWG (3.31mm
)
1,289 feet (392.8 m)
650 feet (198m)