AUSTRALIAN MONITOR AM22P Посібник з монтажу та експлуатації - Сторінка 9
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Speaker Connector Wiring Diagram
Connect the speaker/s based on your required operating mode as shown in the diagrams below
4/8 Ohm
Hum Problems
Most equipment is designed for minimum hum when used under ideal
conditions. When connected to other equipment, and to a safety earth in an
electrically noisy environment, problems may occur.
The three "E"s of hum and hum related noise which can plague your audio
system are:
a) Electrostatic radiation,
b) Electromagnetic radiation, and
c) Earth loops
Electrostatic radiation capacitively couples to system elements, causing an inter-
ference voltage that mainly affects higher impedance paths, such as amplifier
inputs. The source is generally a nearby high voltage, such as a mains lead or
a speaker lead. The problem can usually be reduced by moving the offending
lead away, or by providing additional electrostatic shielding (i.e. an earthed
conductor which forms a barrier to the field).
Electromagnetic radiation induces interference currents into system elements
that mainly effect lower impedance paths. Radio transmitters or stray magnetic
fields from mains transformers are often the cause of this problem. It is generally
more difficult to eliminate this kind of interference, but again, moving the source
away or providing a magnetic shield (i.e. a steel shield) should help.
AMP SERIES CONSTANT VOLTAGE INSTALLATION AUDIO POWER AMPLIFIERS INSTALLATION AND OPERATION MANUAL
70V
Earth loops can arise from the interfacing of the various pieces of equipment
and their connections to various safety earths.
This is by far the most common cause of hum, and it occurs when source
equipment and the amplifier are plugged into different points along the safety
earth where the safety earth wiring has a current flowing through it. The current
flowing through the wire produces a voltage drop due to the wire's resistance.
This voltage difference between the amp earth and source equipment earth
appears to the amplifier's input as a signal and is amplified as hum. There are
three things you can do to avoid earth loop problems:
Ensure the mains power for the audio system is "quiet" i.e. without
•
equipment on it such as air-conditioning, refrigeration or lighting which may
generate noise in the earth circuit.
Ensure all equipment within the system shares a common ground/ safety
•
earth point. This will reduce the possibility of circulating earth currents, as
the equipment will be referenced to the same ground potential.
•
Ensure that balanced signal leads connecting to the amplifier are connected
to earth at one end only.
INSTALLATION
100V
PAGE 9