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Operation Manual
MA Series Power Amplifiers
page 10
3.7 Set Input Sensitivity
The input sensitivity switch inside the amplifier is
set to 0.775 volt RMS at the factory. (Factory set-
ting for international models is 1.4V). It can be
changed to 1.4 volts or a voltage gain of 26 dB. The
26 dB gain setting is equivalent to a sensitivity of
2.2 volts for the Macro-Tech 602, 2.6 volts for the
Macro-Tech 1202 and 3.1 volts for the Macro-Tech
2402.
To change the input sensitivity:
1. Turn off and unplug the amplifier from the AC
source.
2. Remove the input module on the back panel.
3. Locate the labeled access hole for the sensitivity
switch (Figure 3.9). The sensitivity switch will not
be visible because it is mounted below the hole.
Use your little finger to reach it.
4. Set the switch to the desired position.
5. Replace the input module.
3.8 Connect to AC Mains
Connect your amplifier's power cord to the AC
mains power source (power outlet).
WARNING: The third prong of this connector
(ground) is an important safety feature. Do
not attempt to disable this ground connec-
tion by using an adapter or other methods.
Amplifiers don't create energy. The AC mains volt-
age and current must be sufficient to deliver the
power you expect. You must operate your amplifier
from an AC mains power source with not more than
10% variation above or below the amplifier's speci-
fied line voltage and within the specified frequency
requirements (indicated on the amplifier's back
panel label). If you are unsure of the output voltage
of your AC mains, please consult your electrician.
3.9 Startup Procedure
Use the following procedure when first turning on
your amplifier:
1.Turn down the level of your audio source.
2.Turn down the Level controls of the amplifier.
3.Turn on the Power switch. The Enable indicator
next to the Power switch should glow. The amber
ODEP lights should also be glowing.
4.Turn up the level of your audio source to an opti-
mum level.
5.Turn up the Level controls on the amplifier until
the desired loudness or power level is achieved.
6.Turn down the level of your audio source to its
normal range.
If you ever need to make any wiring or installation
changes, don't forget to disconnect the power
cord.
For help with determining your system's optimum
gain structure (signal levels) please refer to the
Crown Amplifier Application Guide, available online
at www.crownaudio.com.
4 Operation
4.1 Precautions
Your amplifier is protected from internal and exter-
nal faults, but you should still take the following
precautions for optimum performance and safety:
1. Before use, configure your amplifier for proper
operation as described in the Setup section of
this manual. Improper wiring can result in
serious operating difficulties. For advanced
setup techniques, consult Crown's Amplifier
Application Guide available online at
www.crownaudio.com.
2. Use care when making connections, selecting
signal sources and controlling the output level.
The load you save may be your own!
3. Do not short the ground lead of an output cable
to the input signal ground. This may form a
ground loop and cause oscillations.
4. Never connect the output to a power supply,
battery or power main. Electrical shock may
result.
5. Tampering with the circuitry, or making unau-
thorized circuit changes may be hazardous and
invalidates all agency listings.
6. Do Not operate the amplifier with the IOC LED
constantly flashing bright green.
7. Do Not overdrive the mixer, which will cause
clipped signal to be sent to the amplifier. Such
signals will be reproduced with extreme accu-
racy, and loudspeaker damage may result.
8. Do Not operate the amplifier with less than the
rated load impedance. Due to the amplifier's
output protection, such a configuration may
result in premature clipping and speaker dam-
age.
Crown is not liable for damage that results from
overdriving oT*D0.001.2tema cmponentgs.