INSTALLATION CONSIDERATIONS
Automating the turn-on of your SI-1260 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-1260 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-1260 in order to prevent system “turn-on thumps”. In order to address these important needs, the SI-1260 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 10).
Important! The Front Panel Power Switch must be in the ON (switch in) position for any of the three turn-on options to function (refer to page 23 for more information concerning the Front Panel Power Switch).
Turn-On Modes
Constant: The auto turn-on circuitry is "OFF". The front panel master power switch operates the amplifier. When the switch is in, the amp is "ON", when it is out, the amp is "OFF".
Audio Sense: The amplifier is "OFF" when there is no audio signal present at any of the 16 inputs, but the sensing circuitry is active. The turn-on sensing circuitry looks for a tiny amount of audio 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, 5/6, etc.) assigned to receive the input signals will switch "ON". Once the audio signal stops, the sensing circuit waits approximately 2-minutes, then switches all amplifier channels "OFF".
3-30V AC/DC Trigger Input: The amplifier is "OFF" when a 3 to 30-Volt AC or DC signal is not applied to the voltage trigger input. Once the sensing circuitry detects such a voltage, all adjacent pairs of amplifier channels that are receiving an audio signal switch "ON". Once the voltage is removed, the Voltage Trigger circuit instant- ly switches the amplifier "OFF". Voltage triggers may be supplied by Niles automat- ed switchers, some video projectors, some surround sound processors, or a 12 Volt DC wall adapter (Niles FG00665) plugged into the switched outlet of your stereo receiver.
If you are using a wall adapter or external power supply to provide the trigger, it doesn't have to be very large (a minimum current capability of 2.5-milliamps for a 3 Volt trigger increasing up to a minimum of 38 milliamps for a 30-Volt trigger).
