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D Series Power Amplifiers
page 9
Operation Manual
2.7 Connect to AC Mains
Connect your amplifier to the AC mains power
source (power outlet) with the supplied AC
power cordset.
WARNING: The third prong of this con-
nector (ground) is an important safety
feature. Do not attempt to disable this
ground connection by using an adapter
or other methods.
Amplifiers don’t create energy. The AC mains
voltage 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 a 10% variation above or a 15%
variation below the amplifier’s specified line
voltage and within the specfied 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.
2.7.1 AC Mains Voltage Configura-
tion
North American 120 VAC, 60 Hz units have a
standard three wire, grounded AC plug as
specified by UL requirements. The 120 volt
models and the European models have the
appropriate plug. The other 200, 220 and 240
volt models have a North American 120 volt
plug. The installer must cut off the plug and
supply and install a plug appropriate for the
installation. Note: Crown assumes no liability
whatsoever for ungrounded operation, nor for
violation of UL or local electrical codes.
120 VAC, 60 Hz North American units do not
have a convertible transformer, and cannot be
used at other voltages and frequencies. Interna-
tional units can be operated with an AC mains
frequency of 50 to 400 Hz, and can be config-
ured by an authorized Crown Service Center for
five different line voltages: 100, 120, 200, 220
and 240 VAC. The back panel sticker indicates
the unit’s factory configuration.
To alter your amplifier’s AC mains voltage con-
figuration, take the unit to an authorized Crown
Service Center.
2.8 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 ampli-
fier.
3. Turn on the “Power” switch. The Power
indicator should glow.
4. Turn up the level of your audio source to
an optimum 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 installa-
tion changes, don’t forget to disconnect the
power cord.
For help with determining your system’s opti-
mum gain structure (signal levels) please refer
to the Crown Amplifier Application Guide,
available online at www.crownaudio.com.
2 Setup