Input Sensitivity - Crown CTs 4200 Operation Manual

5 Advanced Features
and Options
5.3 Options choosing the Right Module
To order accessory modules for your amplifier,
Below are some available options. For current
please refer to the model tag (located on the back
options, visit the Crown website at www.
panel of the amplifier) for your amplifier's specific
crownau dio.com.
model number. Then refer to the chart below to select
5.3.1 Control Modules the correct accessory for your requirements.
Vca-Mc (Vca module): See Figure 5.3. Pro vides
independent remote level control for each channel.
VCA MODULE
4-pin removable Phoenix-style barrier connectors
provide the +10VDC control voltage, ground, and
CTs 4200 VCA-MC4
control lines for two amplifier chan nels. Thus, 4-
channel amplifiers use two connec tors; 8-channel
CTs 4200A VCA-MC4A
amplifiers use four connectors.
CTs 8200
VCA-MC8
CTs 8200A VCA-MC8
Figure 5.3 VCA-MC8 Module
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CTs Power Amplifiers
Wall-Mount level control panels for use with
Vca module:
1-VcaP: See Figure 5.4. Used in conjunction with a
VCA-MC module, this is a single-gang panel
pro viding remote volume control for one or more
CTs amplifier channels. The potentiometer on the
panel is wired directly to one of the VCA connectors
on the VCA-MC.
4-VcaP: See Figure 5.5. This is a two-gang panel
providing remote volume control for four or more
CTs amplifier channels. The potentiometers on the
panel are wired directly to the respective VCA
con nector on the VCA-MC.
Figure 5.4 1-VCAP Module
Refer to the VCA-MC Operation Manual for wiring of
the single or multiple channel level control.
Your amplifier may have come with a VCA-MC
module already factory-installed, or your choice of
MC modules can be easily added to the amplifier by
any authorized Crown Service Center. Contact
Crown Technical Support for more details.

5.3.2 input Sensitivity

The CTs 4200 and CTs 8200 have a fixed input
sen sitivity of 1.4V. A service option is available for
other input sensitivities.
Figure 5.5 4-VCAP Module
Operation Manual
CTs Power Amplifiers
6 Troubleshooting
CONDITION: Power indicator is off.
POSSIBLE REASON
• The amplifier has lost AC power.
• The amplifier's Power switch is off.
• The amplifier is not plugged into the
power receptacle.
• The amplifier output level is so high that
the power supply fuse has blown. Verify
that input levels and output impedances
are within safe ranges. Refer the unit to
an authorized Crown service center for
fuse replacement.
CONDITION: Power indicator is
flashing.
POSSIBLE REASON:
• The AC line voltage has dropped below
10% or has risen above 10% of the
nominal line voltage of the power supply.
Refer to section 5.1.6 for specific voltage
requirements.
Operation Manual
CONDITION: Fault indicator is on.
POSSIBLE REASON:
• The amplifier channel has stopped
oper ating. Return the unit to an
authorized Crown Service Center.
CONDITION: Distorted sound.
POSSIBLE REASON:
• Load is wired incorrectly or Dual/Bridge
mode switch is set incorrectly. Check
both.
• Input is overloaded by a signal level that is
too high. Turn down your amplifier level
controls, or turn down the input sig nal,
until the clip light goes out.
• Thermal Level Control (TLC) is active.
Note: If the signal sounds distorted even
though the Clip LED is off, the input signal is
distorted. Check gain staging and output
lev els of the mixer or preamp.
"Off/Flashing/On" above means that
the LED can be off, or flashing, or on.
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