Crown Audio CTs Series (Multi-Channel) - Manual (Page 7)

Operation Manual
CTs Power Amplifiers
page 12 page 13
CTs Power Amplifiers
Operation Manual
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.
c. Signal indicator
Green LED, one per channel, illuminates to
indicate the presence of input signals
above –40 dBu.
d. clip indicator
Red LED, one per channel, illuminates
when the THD of the channel’s output
sig nal rises to a level typically considered
as the onset of audible clipping. The Clip
Indicator also will illuminate during
Ther mal Level Control (TLC) or input
overload.
e. Thermal indicator
Red LED, one per channel, flashes when
the channel has shut down due to thermal
stress or overload. If the power supply
goes into thermal overload, all channel
LEDs will flash.
F. Fault indicator
Red LED, one per channel, illuminates
when the amplifier output channel has
stopped operating.
g. Ventilation grille
Front-to-rear forced airflow.
H. 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).
i. Power indicator
Blue LED indicates amplifier has been
turned on and AC power is available.
Indi cator also flashes if the amplifier shuts
off due to an under/over-voltage condition
on the AC mains.
J. Power Switch
Amplifier is on when the switch is in the IN
position.
Figure 4.1 CTs 8200 front panel.
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.
M. accessory Panel
CTs 4200: Accepts an optional IQ-MC4A or
VCA-MC4A module.
CTs 8200: Accepts an optional IQ-MC8 or
VCA-MC8 module (explained in Section 5.3.1,
Control Modules).
N. channel Level controls
One 21-position detented rotary potentiometer
per channel, ranging from infinity (-70 dB) to
0 dB attenuation. Refer to Section 5.2.4 for
pre cise dB attenuation increments for each
detent.
O. input connectors
Removable Phoenix-style barrier connectors for
balanced input.
P. Mode Switch
Used on each consecutive pair of channels, this
four-position switch is used to select the
ampli fier’s mode of operation: Dual 8/4 ohms,
Dual 70V, Bridge-Mono 16/8 ohms, and
Bridge-Mono 100V.
iMPORTaNT: Be sure to power off the
amplifier before change the Mode-
switch setting. If this is not done, the Bridge
light will flash to indicate that the power must be
cycled off and back on to reset the mode.
Q. cooling Vents
Front-to-rear forced airflow.
4 Operation
Figure 4.2 CTs 8200 back panel (shown with touch-proof cover removed).