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Macro-Tech 5002VZ Power Amplifier
Reference Manual
the output of each channel. This makes installation con-
venient because there is only one fuse protecting the
loads on each output. The main disadvantage of this
approach becomes apparent if the fuse blows, because
none of the loads will receive any power.
A better approach is to fuse each driver independently.
This allows you to apply the most appropriate protec-
tion for the type of driver being used. In general, low-
frequency drivers (woofers) are most susceptible to
thermal damage and high-frequency drivers (tweeters)
are usually damaged by large transient voltages. This
means that your loudspeakers will tend to have better
protection when the woofers are protected by slow-blow
fuses and high-frequency drivers are protected by high-
speed instrument fuses.
3.4 AC Mains Power Requirements
Each
Macro-Tech 5002VZ
is supplied from the factory
with an appropriate AC cord. Units configured for 100
to 120 VAC operation are shipped with 10 AWG, 30 amp
line cords. Units configured for 200 to 240 VAC opera-
tion are shipped with 12 AWG, 20 amp line cords. North
American units configured for 120 VAC, 60 Hz opera-
tion are provided with a 125 volt, 30 amp NEMA TT30P
plug. Units destined for other parts of the world are pro-
vided without a plug. Whenever possible, connect the
power cord to an isolated power circuit with adequate
current (see Section 7 for detailed information on cur-
rent draw). Excessive line voltages of more than 11%
above the amplifier’s rated line voltage will activate the
overvoltage protection circuitry (refer to Section 4.3.2).
For example, do not exceed a line voltage of 133 VAC
for units configured for 120 VAC operation.
All specifications in this manual were measured using
120 VAC, 60 Hz power mains unless otherwise noted.
Specifications are derived using a mains voltage that is
accurate to within 0.5% and with THD less than 1.0%
under all testing conditions. Performance variations can
occur at other AC mains voltages and line frequencies.
In addition, line regulation problems will directly affect
the output power available from the amplifier.
A qualified technician can reconfigure your amplifier for
different AC voltages and frequencies by changing the
power supply connections on the control board inside
the amplifier. The proper procedures are outlined inside
the top cover of the amplifier. Contact Crown’s Techni-
cal Support Group for more information.
WARNING: Risk of severe electric shock. Only a
qualified technician should attempt to alter the line
voltage configuration.
Although this amplifier is rated for operation at 100 and
120 VAC, it is more efficient at 200, 208, 230 or 240 VAC.
At these higher voltages, less power is converted to
thermal energy in the AC cord and slightly more power
is available at low frequencies.
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