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Turn On Options
For convenience, there are three ways the A 31 can be turned on and off:
• Manually, by pressing the On-Off (Power) button on the front panel.
• Automatically, when an audio signal is present at any of the audio Input jacks.
• Automatically, when a suitable trigger voltage is applied to the 12V input jack.
Note: When either automatic turn on option is selected the front panel
On-Off button is disabled so that power on/off is determined solely by
the triggering preamp, receiver or active audio signal.
Manual Position
When the Turn On Options switch is in its Manual position, the Turn On
Options function is disabled and the A 31 must be turned on and off manually
by pressing the On-Off button on its front panel every time you wish to use
your audio system.
Audio Position (Automatic on/off)
When the Turn On Options switch is set to its Audio position, the A 31 will be turned on only
when an audio signal is present at any of the Input jacks. After the audio signals cease the
A 31 will remain on for about 8 minutes before shutting off. This prevents unintended turn-off
during pauses in your music or movies.
Note: The Audio position of the Turn On Options switch disables the
front panel On-Off button.
Turn On Threshold
This knob sets the audio signal level required for the A 31 to automatically turn on when
the Turn On switch is set to the Audio position. Fully counter-clockwise is the most
sensitive setting and therefore is labeled “Quieter.” Fully clockwise will require a higher
audio signal voltage and is therefore labeled “Louder.” In most systems the best results
will be with the Turn On Threshold knob set towards the Quieter position. In some
systems the A 31 might turn on if there is transient noise in the AC line, even when an
audio signal is not present. Similarly, the A 31 might never shut off even after waiting
more than 10 minutes. In this case, try setting the knob towards the Louder position.
Note: When the Turn On Options switch is set to Audio the A 31 will turn itself on
immediately when you connect its AC cord, even without any audio signal
present. This is normal.
Note: If the A 31 is driving only the sub(s), surround, center, or rear channels you will
achieve more consistent automatic turn on by using the 12V DC trigger. At the
beginning of most films the sub, center and surround levels are lower than the
minimum level required by the Audio sensing circuit.
12V Position (Automatic on/off)
When the Turn On Options switch is set to its 12V position, the A 31 is turned on and off only
with an external +9 V to + 12 V voltage from your preamp or AV Receiver. When the external
voltage ceases the A 31 will turn off immediately. The 12V switch position disables the front
panel On-Off button.