Crown Audio S Series - Manual (Page 11)

page 11
S-Series Power Amplifiers
Operation Manual
2.8 Connect to AC Mains
Connect your amplifier to the AC mains power
source (power outlet) with the supplied AC power
cordset. First, connect the IEC end of the cordset to
the IEC connector on the amplifier; then, plug the
other end of the cordset to the AC mains.
WARNING: The third prong of this connec-
tor (ground) is an important safety feature.
Do not attempt to disable this ground con-
nection by using an adapter or other meth-
ods.
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 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.
2.9 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 Power indicator-
should glow.
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.
2.7 Input Sensitivity Switch
A two-position Input Sensitivity switch is located
on the back panel near the input connectors
(Figure 2.12). Your amplifier is shipped from the
factory with this switch set to the 1.4V position.
At this setting, a 1.4V input signal will drive the
amplifier to full power into an 8-ohm load when
the level controls are turned to maximum. This
setting works best when the amplifier is being
driven by equipment with a +4 dBu output — an
output level at which most professional equip-
ment operates.
If required, the Input Sensitivity switch can be
moved to the 26-dB position, so that the ampli-
fier provides a fixed voltage gain of 20 (or 26 dB:
1 volt in, 20 volts out). This setting works best
with output levels of +10 dBu (2.5 volts RMS) or
more. Some brands of DJ mixers, in particular,
have output levels in this range.
Selecting the correct sensitivity will allow your
equipment to operate at its optimum level and
improve the signal-to-noise of the system.
Make sure the amplifier is turned off and
the level controls are turned down before
you change the switch setting.
Figure 2.12 Location of Input Sensitivity Switch
2 Setup
Sensitivity Switch