Crown Audio CTS4200A Manuel D’Utilisation

Your Crown amplifi er provides extensive protection and 
diagnostic capabilities, including thermal level control, 
fault indicators, automatic high-pass fi ltering, DC pro tect, 
AC under-/over-voltage protection, inrush limiting, and 
variable-speed fans.

If an amplifi er channel starts to overheat, the TLC circuit 
will engage that channel’s input compressor. By 
com pressing the input, the amplifi er will not generate as 
much heat and will have a chance to cool down. The 
degree of compression is proportional to the amount of 
overheating. If the channel becomes too hot for safe 
operation even after full TLC limiting, the channel will 
shut off, and the Thermal Indicator for that channel will 
fl ash brightly to alert the user that a state of thermal stress 
or overload has cause the channel to shut down.

If an amplifi er channel requires service, the correspond-
ing Fault indicator will illuminate to alert the user of this 
condition. If this occurs, return the amplifi er to the Crown 
factory or to an authorized Crown service center.

Crown’s new FIT (Fault Isolation Topology) design 
iso lates channel-specifi c faults, and prevents them from 
affecting remaining channels. If a CTs multi-channel amp 
is powering multiple zones, and a channel fails, the other 
zones continue to operate. FIT makes the CTs 4200 and 
CTs 8200 the most trustworthy multi-channel amplifi ers 
in the business!

A fi xed 35-Hz (70-Hz in CTs 4200) high-pass fi lter per 
channel pair is automatically inserted when the mode 
switch is set to either of the constant-voltage settings. The 
high-pass fi lter corner frequency can be set to 70 Hz, or 
bypassed, with a service option.

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 5.1 
provides 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 (indicated on the 
amplifi er’s back panel label). If you are unsure of the 
out put voltage of your AC mains, 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

A fuse protects the amplifi er from excessive AC current 
draw.

A soft-start circuit in the power supply minimizes the 
amplifi er’s current draw during power-on.

Continuously variable speed fans direct the airfl ow 
through the amplifi er for cooling.

Crown’s new Switching Power Supply minimizes the 
amplifi er’s weight.

Typical non-switching power supplies require large, 
heavy transformers in order to produce the required 
power at the output stage. These transformers must be 
large to absorb the substantial waste that occurs when 
operating at 50 to 60 Hz (standard AC supplied by the 
power company).

By contrast, switching power supplies can operate with a 
much smaller (and lighter) transformer because they fi rst 
convert the AC up to a much higher frequency, thereby 
reducing waste. 

The power supply is voltage-specifi c, allowing use in 
regions using 120V/60Hz, 220V/50Hz, 230V/50Hz, 
240V/50Hz, and 100V/50Hz AC mains.

Each consecutive pair of channels has one four-position 
switch that selects the amplifi er’s mode of operation. The 
switch positions are:

Dual mode for 4 or 8 ohm operation.

Dual mode for 70V constant-voltage 

opera tion.

Bridge-Mono mode for 8 or 16 ohm opera tion.

Bridge-Mono mode for 100V constant-voltage 

operation.

This yellow LED indicates when the amplifi er’s mode 
switch is set to the Bridge position. Each consecutive pair 
of channels has one Bridge LED.

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