Frequency Response; Phase Response ; Damping Factor:- Page 7

INSTALLED SOUND



SPECIFICATIONS

Frequency Response

 (at 1 watt, 20 Hz - 20 kHz): 

±0.5 dB.

Phase Response 

(at 1 watt, 10 Hz - 20 kHz): ±35°.

Signal to Noise Ratio below rated power

 (20 Hz to 

20 kHz): 100 dB unweighted.

Total Harmonic Distortion (THD) at  1 watt, from 

20 Hz to 20  kHz:

 < 0.05%.

Intermodulation Distortion (IMD) 60 Hz and 7 

kHz at 4:1, from 163 milliwatts to full bandwidth 

power:

 < 0.05% (typical).

Damping Factor:

 10 Hz to 400 Hz: >180.

Crosstalk 

(below rated power,  20 Hz to 1 kHz):

> 

80 dB.

Common Mode Rejection (CMR) 

(20 Hz to 1 kHz):

> 50 dB.

DC Output Offset 

(shorted input):

< ±5 mV.

Input Impedance 

(nominal): 20 kilohms balanced, 

10 kilohms unbalanced.

Maximum Input Level 

(before input compression): 

+ 20 dBu.

Load Impedance:

 (Note: Safe with all types of 

loads)

Stereo: 4/8 and 25 ohms (70V) 

Bridge Mono: 8/16 and 50 ohms (100V)

Voltage Gain (at maximum level setting), 1.4V 

sensitivity,

4/8 Ohm Operation: 20:1 (26 dB); 

70V Operation: 50:1 (34 dB) 

100V Operation: 71.4:1 (37 dB) 

AC Line Voltage and Frequency Configurations 

Available

 (±10%):

120V/60 Hz, 220/230/240V/50 

Hz.

Power Draw at Idle (120VAC mains, all channels 

in 4/8 ohm mode):

 58W.

Power Draw at Idle (120VAC mains, all channels 

in 70V mode): 

77W.

Cooling: 

Continuously variable speed forced air, 

front-to-back airflow.

Dimensions (Width, Height, Depth):

CTs 4200: 19 in. (48.3 cm) W x 3.5 in. (8.9 cm) 

H x 16.25 in. (41.3 cm) D.
CTs 8200: 19 in. (48.3 cm) W x 5.25 in. (13.3 

cm) H x 16.25 in. (41.3 cm) D.

Weight (Net, Shipping):

CTs 4200: 27 lb 8 oz (12.5 kg), 

32 lb (14.5 kg)
CTs 8200: 36 lb 6 oz (16.5 kg), 

47 lb (21.3 kg).

Front Panel Controls and Indicators

Bridge Mode Indicator:

 Yellow LED, one per 

channel pair, illuminates when the channel pair’s 

Mode Switch is set to the “Bridge” position. If Mode 

switch is changed while amplifier is powered up, 

Bridge LED will flash, indicating that the amplifier 

must be powered off and on to reset the Mode.

Ready Indicator:

 Green LED, one per channel, 

illuminates when the channel is initialized and ready 

to produce audio output.

C

rown’s CTs Multi-Channel Series offers wide flexibility for a wide range of installed sound applica-

tions. CTs Multi-Channel Series amplifiers offer independent selection of high- and low-impedance 

operation for each channel pair, making these amps ideal for multi-zone installations.

Signal Indicator:

 Green LED, one per channel, 

illuminates to indicate the presence of analog input 

signals above –40 dBu.

Clip Indicator: 

Red LED, one per channel, illumi-

nates when the THD of the channel’s output signal 

rises to a level typically considered as the onset of 

audible clipping. The Clip Indicator also will illumi-

nate during Thermal Level Control (TLC) or input 

overload.

Thermal Indicator:

 Red LED, one per channel, 

flashes when a state of thermal stress or overload 

has caused the channel to shut down. If the power 

supply goes into thermal overload, all channel LEDs 

will flash.

Fault Indicator:

 Red LED, one per channel, flashes 

when a fault condition has occurred in the channel. 

Ventilation Grille:

 Front-to-rear forced airflow.

Data Indicator:

 Yellow LED indicates IQ Loop data 

activity (if the amplifier is equipped with an IQ-MC 

module, and connected to an IQ Loop).

Power Indicator:

 Blue LED indicates amplifier has 

been turned on and AC power is available. Indica-

tor also flashes if the amplifier shuts off due to an 

under-/over-voltage condition on the AC mains.

Power Switch:

 Amplifier is on when the switch is in 

the IN position.

Back Panel Controls and Connectors

AC Power Cord Connector:

 IEC inlet, type 320;

100/120VAC units: 15A; 

220/230/240VAC units: 10A. 

Voltage is indicated above IEC inlet.

Output Connectors:

 One four-pole terminal strip 

for every two channels with touch-proof cover.  

Accepts up to 10 AWG terminal forks. 

Accessory Panel:

 CTs 4200 accepts an optional 

VCA-MC4A module. CTs 8200 accepts an optional 

VCA-MC8 module.

Channel Level Controls:

 One 21-position detented 

rotary potentiometer per channel, ranging from 

infinity (–70 dB) to 0 dB attenuation. 

Input Connectors:

 Removable Phoenix-style barrier 

connectors for balanced input. Also can be used as 

a CobraNet input or a backup for CobraNet. 

Mode Switch:

 Used on each consecutive pair of 

channels, this four-position switch is used to select 

the amplifier’s mode of operation: Dual 8/4 ohms, 

Dual 70V, Bridge-Mono 16/8 ohms, and Bridge-

Mono 100V. 

Cooling Vents:

 Front-to-rear forced airflow.

Options

Control Modules:

 VCA-MC4A: VCA module for CTs 

4200A. VCA-MC8: VCA module for CTs 8200.

Wall-mount level control panels for use with VCA 

module:

 1-VCAP: Single-gang panel with 1 VCA 

channel volume control. 4-VCAP: Two-gang panel 

with 4 VCA channel volume controls.

T-170V: 

This is an autoformer that allows 100V 

output from the amplifier, and allows other ampli-

fiers without direct constant voltage output to be 

easily integrated into distributed systems.

TP-170V: 

This is a rack-mountable panel with four 

autoformers as described above. 

Protection Systems

Thermal Level Control (TLC):

 If an amplifier chan-

nel starts to overheat, the TLC circuit will engage 

that channel’s input compressor. By compress-

ing 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.

FIT

 (Fault Isolation Topology): Isolates faults within 

affected channels.

Fault:

 If an amplifier channel requires service, the 

corresponding 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.

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 in the CTs 8200 can be set to 70 

Hz, or bypassed, with a service option.

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.  

Models

Under-Voltage 

Limit

Over-Voltage 

Limit

100VAC  

(CTs 8200 only)

90VAC

110VAC

120 VAC units

108VAC

132VAC

220V/230V/240V 

units

198VAC

264VAC

Power Fuse:

 A fuse protects the amplifier from 

excessive AC current draw.

Inrush Limiting:

 A soft-start circuit in the power 

supply minimizes the amplifier’s current draw 

during power-on.

Variable-speed Fan:

 Continuously variable speed 

fan directs the airflow through the amplifier for 

cooling.

Regulatory Certifications

Other Applications

8/07                                                           136318-1K