Plena Mixer AmplifierSystem Overview en 11
3.3The Plena Mixer Amplifier
The Plena Mixer Amplifier is a high performance, professional public address unit for mixing up to four separate microphone/line signals, and one music signal.
The volume of each microphone/line signal can be individually adjusted to obtain the required mix; the mixed output is controlled via the master volume control and separate high/low tone controls. The unit is easy to use, and provides a crisp call or clear music. The amplifier also has enhanced features such as priority, labeling, and setting indicators.
All Microphone/line inputs can be switched between microphone level and line level sensitivity. The inputs are balanced but can also be used unbalanced. Phantom power can be selected via a DIP switch to provide power to condenser microphones. Input channel 1 can take priority over all other microphone and music input:
–Input 1 can be activated by contact closure on a PTT (push to talk). A chime can be configured to precede an announcement.
Users can create a custom label for inputs and music sources. The label can be attached to the special holder at the front of the mixer amplifier. Colored pins can also be inserted at various positions around the volume and tone dial controls to indicate favorite settings for a particular application.
An LED meter monitors the master output before the zone selection. This signal is also present on the headphone connector below the output meter. For total reliability and ease of use, a limiter is integrated into the output stage to restrict output if the user applies too much signal.
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