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Operation Manual
CTs Power Amplifi ers
page 38
3.7 Connect to AC Mains 
Connect your amplifi er 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 amplifi er; then, plug the other end of 
the cordset to the AC mains. 
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.
Amplifi ers don’t create energy. The AC mains volt age 
and current must be suffi cient to deliver the power you 
expect. If the AC line voltage varies out of an acceptable 
range, the amplifi er’s power supply turns off and the 
blue Power LED fl ashes. The amplifi er will turn back on 
when the AC line voltage returns to safe operating 
levels. Figure 3.10 pro vides voltage limits for all 
amplifi er AC voltage con fi gurations. Also, the amplifi er 
must be run within the specifi ed mains frequency 
requirements (indi cated on the amplifi er’s back panel 
label). If you are unsure of the output voltage of your 
AC mains, please consult your electrician.
Models
Under-Voltage
Limit
Over-Voltage
Limit
100VAC 
(CTs 8200  
only)
90VAC
110VAC
120 VAC units
108VAC
132VAC
220V/230V/
240V units
198VAC
264VAC
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 
indica tor  should  glow. 
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.
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 Amplifi er Application Guide, available online 
at www.crownaudio.com.
3 Setup
Figure 3.10  AC Under-Voltage and Over-Voltage 
Limits for Various Amplifi er Models