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CHANNEL
A
lN!wT
--
SEN!3TlVITY
MADE
IN
U.S.A.
CHANNEL
0
INPUT
SENSITIVITY
CS”
12ooz
PROFESSIONAL STEREO POWER AMPLIFIER
DDTTM
ACTIVE
LEDs
(1)
The
DDTTM
active
LEDs
indicate when compression is taking place. As long as gain reduction is
occurring, the LED will continue to light, thereby giving a valuable indication of this unique
compression function. The DDT function can be defeated on both channels simultaneously by
selecting the defeat position on the DDT compression switch (7) located on the back panel of the
CS 1200X. When the compressor is defeated, the DDT active LED will indicate clipping, this
being the condition where the amp is failing to faithfully reproduce the input signal. A more
thorough discussion of the DDT function is included later in this manual.
HIGH TEMPERATURE
LEDs
(2)
These
LEDs
illuminate whenever the thermal logic system has determined that a particular
channel is operating above safe temperature limits and has shut down the unsafe channel. When
this LED is illuminated, the
“0”
LED will also go out on that channel. Excessive temperature
conditions can occur in the CS
1200X
if either or both channels are continuously operated into
less than
2-ohm
loads (or a short circuit), or if the ambient temperature of the air supply becomes
too hot to provide adequate cooling even under normal
2-ohm
or greater loading situations. Since
the CS 1200X is a “redundant” amplifier, the shutdown of one channel will not affect the opera-
tion of the other channel. When the unsafe channel has cooled down to safe limits, operation will
be restored in that channel. Normal operation is indicated when the high temperature LED is off
and the
“0”
LED is on. Continued operation under fault conditions will not harm the amplifier,
but because of the nuisance factor, steps should be taken to determine the problem and solve it.
LED ARRAYS (3)
The CS 1200X has a tri-colored LED array on each channel to indicate the output power level.
The LED array is calibrated in two different ways to offer maximum flexibility and ease of use.
To the left of each LED ladder, the calibration is percent of full power output. The top LED,
labeled
lOO%,
will flash when the CS 1200X has reached full RMS power output capability on
4