7
Control Trigger and Muting
Each pair of amplifier channels has its own 1/8” (3.5mm) mono minijack control input / output (pass through)
to provide remote switching of the amplifier audio mute on/off feature. The control input circuit is designed to
work as a Tip Pos. (+) and Ring Neg. (-) mono minijack connection. A minimum of 5VDC @ 1 mA is recom-
mended, and is compatible with up to 24V AC or DC. A preamplifier’s control output, such as is provided with
the B&K series preamplifier, can be utilized to provide a control signal to the AV1230. When Local channel
control muting is desired, the proper Dip Switch configuration must be set with all Dip Switches in the off posi-
tion, as shown below.
To the Trigger Input
on the Next Amplifier
Control Input
From the Trigger Output
on the Previous
Preamplifier, Receiver or
Amplifier
ON: (ON is the factory default setting for all amplifier pairs)
Amplifier pairs with Dip Switch On set to ‘On’, have the remote Bus and Channel switching of the
amplifier audio mute on/off feature disabled. When remote amplifier audio muting is desired by
either the Bus or Local Channel control input, the Amp switch must be set to the ‘Off’ position.
BUS: (OFF is the factory default setting for all amplifier pairs)
Amplifier pairs (channels 1-2, 3-4 and 5-6), with Dip Switch Bus set to ‘On’, have their inputs
sourced from the audio signal present at the Bus input. When the Bus feature is not desired and
the amplifier pair is to be sourced at the Local audio inputs, the Bus switch must be set to the ‘Off’
position.
MONO: (OFF is the factory default setting for all amplifier pairs)
Amplifier pairs with Dip Switch Mono set to ‘On’, have the sum of the selected audio inputs, i.e..
Local or Bus, processed into a composite mono signal source for both amplifier channels. When
mono is not desired, or independent channel amplification of the amplifier pairs is necessary, the
Mono switch must be set to the ‘Off’ position.
SENSE: (OFF is the factory default setting for all amplifier pairs)
Amplifier pairs with Dip Switch Sense set to ‘On’ have the remote Master and Channel switching of
the amplifier audio mute on/off feature disabled. Amplifier pairs set to use Sense will mute automati-
cally after a delay of three minutes once no audio signal has been detected. The sense circuit mon-
itors the selected audio input, i.e. Local or Bus, mono or stereo. When remote amplifier audio mut-
ing is desired by either the Master or Local channel control input, the Sense switch must be set to
the ‘Off’ position. When the Amp On feature is desired, the automatic muting of the amplifier pairs is
not desired, or if the audio signal is erratic the Sense switch must be set to the “Off’ position.
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