Owner's Manual

10
Turn On Options
The setting of the rear panel Turn On Options switch determines how the amplifier turns on and off.
Setting the Turn On Options switch to Audio or 12 V disables the A 23+’s front panel Power button.
There are three positions for this switch:
Manual:
When the Turn On Options switch is set to Manual the A 23+ is turned
on and off manually only by pressing the Power button on its front
panel every time you want to listen to music.
Audio:
When the Turn On Options switch is set to the Audio position, the A
23+ will be turned on automatically when an audio signal is present at
the L or R Input jacks. After the audio signal ceases the amplifier will
remain on for about 10 minutes before shutting itself off. This prevents
unintended turn-off during pauses in your music...
12 V Trigger:
When the Turn On Options switch is set to its 12 V position, the A 23+
is turned on and off only with an external +9 V to +12 V DC voltage.
When the external voltage ceases the amp will turn off within a few
seconds. The 12 V turn on trigger circuit in the A 23+ requires a mere
5mA from the 12 V trigger source.
Turn On Threshold
This knob sets the audio signal level required for the A 23+ to automatically turn on when the Turn On
Options switch is set to the Audio position. Fully counter-clockwise is the most sensitive setting and therefore
is labeled “Quieter.” Fully clockwise requires 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 at or towards the Quieter
position. In some systems the A 23+ might turn itself on if there is a transient noise in the AC power line,
even when an audio signal is not present. Similarly, the A 23+ might never shut off even after waiting more
than 10 minutes. In this case, try rotating the knob towards the Louder position.