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CTs Power Amplifi ers
Operation Manual
3.7 Connect to AC Mains
On the back panel, check whether your amplifi er is labeled
for 120V or 220-240V AC mains. Connect your amplifi er to
the corresponding AC mains power source (power out let)
with the supplied AC power cordset. First, connect the IEC
end of the cordset to the IEC connector on the ampli fi er.
Then, with the amplifi er in the OFF position, plug the other
end of the cordset into the AC mains.
WARNING: The third prong of this connector
(ground) is an important safety feature. Do not
attempt to disable this ground connection by
using an adapter or other methods.
Amplifi ers don’t create energy. The AC mains voltage and
current must be suffi cient to deliver the power you expect.
Check the amplifi er’s back-panel label which specifi es the
required AC mains voltage and frequency. The AC mains
voltage must be no more than 15% above the required
voltage, and no less than 25% below the required voltage.
The AC mains frequency must be within the required
fre quency range. If you are unsure of the output voltage of
your AC mains, please consult your electrician.
3.8 Startup Procedure
Use the following procedure when fi rst turning on your
amplifi er:
1. Turn down the level of your audio source.
2. Turn down the level controls of the amplifi er.
3. Turn on the “Power” switch. The Power indicator
should glow. Wait for the “Ready” LED to illuminate.
4. Turn up the level of your audio source to an optimum
level.
5. Turn up the Level controls on the amplifi er until the
desired loudness or power level is achieved. Verify
that the Signal LED is fl ashing.
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 turn off the amplifi er and discon nect the
power cord.
For help with determining your system’s optimum gain
structure (signal levels) please refer to the Crown Ampli fi er
Application Guide, available online at
www.crownaudio.com.
4 Operation
4.1 Precautions
Your amplifi er is protected from internal and external
faults, but you should still take the following precautions
for optimum performance and safety:
1. Before use, your amplifi er fi rst must be confi gured for
proper operation, including input and output wiring
hookup. Improper wiring can result in serious
operat ing diffi culties. For information on wiring and
confi g uration, please consult the Setup section of this
manual or, for advanced setup techniques, consult
Crown’s Amplifi er 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 unauthorized
circuit changes may be hazardous and invalidates all
agency listings.
6. Do not operate the amplifi er with the red Clip LEDs
constantly fl ashing.
7. Do not overdrive the mixer, which will cause clipped
signal to be sent to the amplifi er. Such signals will be
reproduced with extreme accuracy, and loudspeaker
damage may result.
8. Do not operate the amplifi er with less than the rated
load impedance. Due to the amplifi er’s output
protec tion, such a confi guration may result in
premature clipping and speaker damage.
Remember: Crown is not liable for damage that results
from overdriving other system components.
3 Setup