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Mode/Gain Selection Switch (100V, 70V, LowZ)
The three-position gain select switch found on the rear panel of the CKd is
used to set the overall gain and protection thresholds (ACL & IGM) of the
amplifier channels. The '100V' position set's the channel gain to x50 with a
2.0V sensitivity. The '70V' position set's the channel gain to x50 with a 1.414V
sensitivity. The 'LowZ' position set's the channel gain to x40 with a 1.4V
sensitivity for 8 Ohms and 1.0V sensitivity for 4 Ohms loads. The protection
limiter thresholds are adjusted accordingly.
In '100V
and '70V' modes, a 70 Hertz, third order, high pass filter is
automatically engaged.
control of the HPF can be done through software control. The HPF has two
modes:
Auto Mode: (default) filter is automatically engaged / disengaged
depending on the Mode/Gain switch.
Discrete Mode: HPF can be engaged / disengaged independent of the
Mode/Gain switch.
Sequential Turn-On/Turn-Off (STO)
CKd Power Processing amplifiers come standard with Sequential Turn-
On/Turn-Off (STO) circuitry. If the amplifier front power switch is set to
"remote," a single SPDT toggle switch or two SPST momentary switches can
be used to turn the amplifier on and off. Using the same switch(es), additional
amplifiers can be turned on/off sequentially by daisy chaining the STO "Out"
terminals of one amplifier to the STO "In" terminals of a subsequent amplifier.
The standard turn-on delay time between amplifiers is approximately 100ms;
turn-off delay time is 200ms. Note: when using NexSys
hardwiring for manual switch closure between amplifiers should be used
cautiously. If the switch closure output is wired up, it WILL cause the next
amp to switch, regardless of which source (hardware switch or NexSys
STO command) has initiated the command.
Standard Sequential Turn-On/Turn-Off Wiring
For non-NexSys remote turn-on, a single SPDT toggle switch or two SPST
momentary switches can be used. In either case, the switch(es) are wired to
the "STO In" connector on the amplifier's rear panel and the amplifier's front
panel power switch must be set to "Remote." With an SPDT toggle, the center
tap of the switch must be wired to the "Com" pin on the connector, one of the
end taps must be wired to the "On" pin, and the other end tap must be wired to
the "Off" pin. When the switch shorts the "On" and "Com" pins, the amplifier will
turn-on. Likewise, throwing the switch and shorting the "Off" and "Com" pins
turns the CKd off. See the diagram below:
CKd Series Owners Manual v1e
In 'LowZ' mode, the HPF is disengaged.
SPDT Switch
Com
On
To STO In
Com
of next amp
Off
CKd Owner's Manual
Further
or NWare
control,
Page 12
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