Niles Audio SI-1230 manual Installation Considerations

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

Constant – The auto turn-on circuitry is off. The front panel master power switch operates the amplifier. In is “On”, Out is “Off”.

Audio Sense – The master switch on the 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 circuitry looks for a signal present at any of the audio inputs. If it detects a signal, the adjacent pair of amplifier channels (i.e. channel 1 & 2 , 3

&4, etc.) assigned to receive the input signals will turn on. Once the audio signal stops, the sensing circuit waits two minutes, then turns all amplifier channels off.

Figure 7

TURN ON MODE

AUDIO SENSE 3-30V

CONSTANTAC/DC TRIGGER INPUT

Important! The Front Panel

Power Switch must be in the ON (switch in) position for any of the three turn- on options to function

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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