Installation Considerations - Niles SI-1230 Series 2 Installation Manual

INSTALLATION CONSIdERATIONS

Automating the turn-on of your SI-1230 is one of the easiest steps when installing
it in a distributed system. However, do not plug the main power cord into the
switched AC outlet of your preamplifier or receiver. The high power design of the
SI-1230 requires large amounts of current from its AC power source. Additionally, it
is always recommended to activate the system preamplifier/receiver before turning
on your SI-1230 in order to prevent system "turn-on thumps". In order to address
these important needs, the SI-1230 has three special turn-on modes that let you
turn the amplifier on only when it is needed. These three options are accessed by
the Turn-On Mode selector switch (see Figure 7).
Turn-On Modes
Figure 7
Constant – The auto turn-on circuitry is off. The
TURN ON MODE
front panel master power switch operates the
AUDIO SENSE
amplifier. In is "On", Out is "Off".
3-30V
AC/DC
CONSTANT
TRIGGER
Audio Sense – The master switch on the
INPUT
front panel must be in the "On" position. The
amplifier is off when there is no audio signal
present at any of the audio inputs, but the
sensing circuitry is on. The turn-on sensing
ImporTanT! The FronT Panel
circuitry looks for a signal present at any of the
Power SwiTch muST be in
audio inputs. If it detects a signal, the adjacent
The on (SwiTch in) PoSiTion
pair of amplifier channels (i.e. channel 1 & 2 , 3
For any oF The Three Turn-
& 4, etc.) assigned to receive the input signals
will turn on. Once the audio signal stops, the on oPTionS To FuncTion
sensing circuit waits two minutes, then turns all
amplifier channels off.
3-24 Volt Ac/Dc Opto-Isolated Voltage Trigger - The Power switch on the front
panel must be in the "On" position for the voltage trigger to function. When a
Trigger Plug is inserted into the rear panel connector and the sensing circuitry
detects a voltage, the amplifier is turned on. Once the Trigger voltage is turned off,
the sensing circuit instantly turns the amplifier off. The amplifier is off when there
is no 3-24V AC or DC voltage detected at the trigger input. Voltage triggers can
be supplied by Niles automated switchers, some video projectors, some surround
sound processors, or something as simple as a 12 volt AC wall adapter plugged
into the switched outlet of your stereo receiver. Linear DC wall adapters are not
recommended; the long discharge time of the DC adapter's filter capacitor will
delay the turn-off of the amplifier. Trigger sources must be 3-24VAC or DC, 20mA or
greater.
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