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CONNECTING AN EXTERNAL DC SOURCE
FOR A 21 AUTOMATIC TURN ON-OFF
8
1
2
YOU SHOULD KNOW
If the device you want to use to control your A 21 doesn’t have a 2.5 mm trigger output
connector, you can cut one plug off the cable and terminate the end as required. The lead
with the red stripe is positive and the lead without the stripe is negative.
CONTROL
COMPONENT
Input
1
2
2.5 mm sub-mini plug
If you want to automatically turn on and off the A 21 with an external DC voltage, choose
the DC Triggering option by moving the Auto Turn On switch on the rear panel to its lower
12V position.
What You’ll Need:
• A cable with a 2.5 mm sub-mini plug on each end (provided)
• A “control” component with +9Vdc to +12Vdc trigger voltage
Before Connecting
Remove Power to all the components in your audio system.
Make sure the Auto Turn On switch on the A 21 rear panel is in its 12V (down) position.
To Connect
Plug one end of the trigger wire into the 12V Input jack on the A 21.
Plug the other end of this wire into the external DC source.