Crown CTs 4200 Operation Manual page 7

4 Operation
4.2 Front Panel Controls
and Indicators
Note: cTs 8200 is shown. Some cTs 4200
features are in different locations.
a. Bridge Mode indicator
Yellow LED, one per channel pair,
illumi nates 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,
indicat ing that the amplifier must be
powered off and on to reset the Mode.
B. Ready indicator
Green LED, one per channel, illuminates
when the channel is initialized and ready to
produce audio output.
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F. Fault indicator
c. Signal indicator
Green LED, one per channel, illuminates to
Red LED, one per channel, illuminates
indicate the presence of input signals
when the amplifier output channel has
above –40 dBu.
stopped operating.
d. clip indicator g. Ventilation grille
Red LED, one per channel, illuminates
Front-to-rear forced airflow.
when the THD of the channel's output
sig nal rises to a level typically considered
H. data indicator
as the onset of audible clipping. The Clip
Yellow LED indicates IQ Loop data activity
Indicator also will illuminate during
(if the amplifier is equipped with an IQ-MC
Ther mal Level Control (TLC) or input
module, and connected to an IQ Loop).
overload.
i. Power indicator
e. Thermal indicator
Blue LED indicates amplifier has been
Red LED, one per channel, flashes when
turned on and AC power is available.
the channel has shut down due to thermal
Indi cator also flashes if the amplifier shuts
stress or overload. If the power supply
off due to an under/over-voltage condition
goes into thermal overload, all channel
on the AC mains.
LEDs will flash.
J. Power Switch
Amplifier is on when the switch is in the IN
position.
Figure 4.1 CTs 8200 front panel.
CTs Power Amplifiers CTs Power Amplifiers
4 Operation
4.3 Back Panel Controls
and Connectors
Note: cTs 8200 is shown. Some cTs 4200
features are in different locations.
K. ac Power cord connector
Standard IEC type 320 inlet.
120V models: 15-amp.
220-240V models: 10-amp.
Voltage is indicated above IEC inlet.
L. Output connectors
One four-pole terminal strip for every two
chan nels with touch-proof cover. Accepts up to
10 AWG terminal forks. To connect outputs, first
remove the touch-proof cover plate covering the
terminal strip by removing the screw which
holds it in place.
Operation Manual Operation Manual
M. accessory Panel P. Mode Switch
CTs 4200: Accepts an optional IQ-MC4A or Used on each consecutive pair of channels, this
VCA-MC4A module. four-position switch is used to select the
ampli fier's mode of operation: Dual 8/4 ohms,
CTs 8200: Accepts an optional IQ-MC8 or
Dual 70V, Bridge-Mono 16/8 ohms, and
VCA-MC8 module (explained in Section 5.3.1,
Bridge-Mono 100V.
Control Modules).
iMPORTaNT: Be sure to power off the
N. channel Level controls amplifier before change the Mode-
switch setting. If this is not done, the Bridge
One 21-position detented rotary potentiometer
light will flash to indicate that the power must be
per channel, ranging from infinity (-70 dB) to
cycled off and back on to reset the mode.
0 dB attenuation. Refer to Section 5.2.4 for
pre cise dB attenuation increments for each
Q. cooling Vents
detent.
Front-to-rear forced airflow.
O. input connectors
Removable Phoenix-style barrier connectors for
balanced input.
Figure 4.2 CTs 8200 back panel (shown with touch-proof cover removed).
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