Crown-audio CTs 8200 User Manual download pdf (Page 14)

Operation Manual

CTs Multi-Channel Power Amplifiers

page 14

NOTE: For more information about these Crown

amplifier features, please visit the Crown web-

site at www.crownaudio.com.

5.1 Protection Systems

Your Crown amplifier provides extensive protection and

diagnostic capabilities, including thermal level control,

fault indicators, automatic high-pass filtering, DC pro-

tect, AC under-/over-voltage protection, inrush limiting,

and variable-speed fans.

5.1.1 Thermal Level Control (TLC)

If an amplifier channel starts to overheat, the TLC circuit

will engage that channel’s input compressor. By com-

pressing the input, the amplifier 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

flash brightly to alert the user that a state of thermal

stress or overload has cause the channel to shut down.

5.1.2 Fault

If an amplifier channel requires service, the correspond-

ing Fault indicator will illuminate to alert the user of this

condition. If this occurs, return the amplifier to the Crown

factory or to an authorized Crown service center.

5.1.3 Fault Isolation Topology (FIT)

Crown’s new FIT (Fault Isolation Topology) design iso-

lates channel-specific 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 amplifiers

in the business!

5.1.4 35-Hz High-Pass Filter

A fixed 35-Hz (70-Hz in CTs 4200) high-pass filter per

channel pair is automatically inserted when the mode

switch is set to either of the constant-voltage settings.

The high-pass filter corner frequency can be set to 70 Hz,

or bypassed, with a service option.

5.1.5 AC Under-/Over-Voltage

Protection

If the AC line voltage varies out of an acceptable range,

the amplifier’s power supply turns off and the blue Power

LED flashes. The amplifier will turn back on when the AC

line voltage returns to safe operating levels. Figure 5.1

provides voltage limits for all amplifier AC voltage con-

figurations. Also, the amplifier must be run within the

specified mains frequency requirements (indicated on the

amplifier’s back panel label). If you are unsure of the out-

put voltage of your AC mains, consult your electrician.

5.1.6 Power Fuse

A fuse protects the amplifier from excessive AC current

draw.

5.1.7 Inrush Limiting

A soft-start circuit in the power supply minimizes the

amplifier’s current draw during power-on.

5.1.8 Variable-speed Fans

Continuously variable speed fans direct the airflow

through the amplifier for cooling.

Models

Under-Voltage

Limit

Over-Voltage

Limit

100VAC

(CTs 8200 only)

90VAC 110VAC

120 VAC units 108VAC 132VAC

220V/230V/

240V units

198VAC 264VAC

5.2 Advanced Features

5.2.1 Switching Power Supply

Crown’s new Switching Power Supply minimizes the

amplifier’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 first

convert the AC up to a much higher frequency, thereby

reducing waste.

The power supply is voltage-specific, allowing use in

regions using 120V/60Hz, 220V/50Hz, 230V/50Hz,

240V/50Hz, and 100V/50Hz AC mains.

5.2.2 Mode Switch

Each consecutive pair of channels has one four-position

switch that selects the amplifier’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.

Be sure to turn off the amplifier before changing

the Mode-switch setting.

5.2.3 Bridge Mode Indicator

This yellow LED indicates when the amplifier’s mode

switch is set to the Bridge position. Each consecutive pair

of channels has one Bridge LED.

5 Advanced Features

and Options

Figure 5.1 AC Under-Voltage and

Over-Voltage Limits for Various Amplifier

Models

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 31 32

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Crown-audio CTs 8200 User Manual Page 14

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