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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 1000X. 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 illumi-
nated, the
“0”
LED will also go out on that channel. Excessive temperature conditions can occur in the
CS 1000X if either or both channels are continuously operated into less than
2-ohm
loads (or a short cir-
cuit), 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 1000X is a “redundant” amplifier, the
shutdown of one channel will not affect the operation 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 1000X 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. In the center of the
LED ladder, the calibration is percent of full power output. The top LED, labeled
lOO%,
will flash when the
CS 1000X has reached full RMS power output capability on that particular channel. Operation at power
output levels below 100% will naturally be indicated by lower LED readings. The lowest value indicated is
0.4% of full power, which corresponds to 2.0 watts RMS output into 4 ohms. Operation below that power
level will not be indicated, since the lowest LED is calibrated at 0% or standby. As mentioned, this LED
should be illuminated whenever the amplifier is operating with AC mains power applied under zero signal
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