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Macro-Tech 5000VZ 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, be-
cause 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 5000VZ 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
operation are shipped with 12 AWG, 20 amp line cords.
North American units configured for 120 VAC, 60 Hz
operation are provided with a 125 volt, 30 amp NEMA
TT30P plug. Units destined for other parts of the world
are provided without a plug. Whenever possible, con-
nect the power cord to an isolated power circuit with
adequate current (see Section 7 for detailed informa-
tion on current 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 volt-
age of 133 VAC for units configured for 120 VAC opera-
tion.
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 frequen-
cies. 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 in-
side the amplifier. The proper procedures are outlined
inside the top cover of the amplifier. Contact Crown’s
Technical 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 con-
verted to thermal energy in the AC cord and slightly
more power is available at low frequencies.
