Daisy-chaining Mixers
When more than four microphones are needed, it is possible to daisy-chain multiple
SmartMixers together through the Link In/Out connectors on the backs of the units (Fig. 2).
Connect Mixer #1 Link Out jack to Mixer #2 Link In jack, etc. Mixer #1 output contains only
audio from the first four microphones; Mixer #2 output then contains audio from all the
microphones plugged into Mixer #1 and the microphones plugged into Mixer #2. The last
mixer in the chain contains audio from all preceding mixers. The combined output is then
taken from the last mixer in the chain. Because lockout information is passed between mixers
through Link In/Out, the last-microphone-on condition is not violated. Thus only one
microphone per installation will stay on when no one is speaking.
Note that one or more mixers can be switched to “Manual” mode without affecting the
automatic operation of any other mixers in the chain.
Rack Mounting
Provided with each mixer are two rack ears, one long and one short, and six self-tapping
screws to attach the ears to the unit. When using more than one SmartMixer in a system, it
may be advantageous to mount two mixers in a 1U rack space. This can be accomplished using
the two short rack ears and an optional joining plate (Model AT8628), which allows two units
to be connected side-by-side in a single rack space.
Security Caps
For permanent installations where microphone selections, positions and acoustic conditions
are constant, it may be advantageous to remove the front panel knobs and install security
caps to prevent unauthorized adjustments. To install, simply press the caps into place,
covering the Gain and Threshold controls. Place the provided sticker over the Master Level
access opening in the panel. The system should be tested carefully before installing the security
caps because they are intended to be “permanent” and are very difficult to remove.
If removal of installed security caps becomes necessary, first remove the two screws on each
side of the unit and remove the top cover. Then remove the six screws that attach the front
panel: four on top and two underneath. Remove the front panel. With the panel removed, the
two locking tabs on each security cap can be accessed. The cap can be released by carefully
squeezing the two tabs together.
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