Extron Electronics MVC 121 Plus User Guide - Manual (Page 17)

Operation
This section describes the operation of the MVC 121 Plus, including:
• MVC 121 Plus Operation
• DSP Processing/Signal Flow
• Filter Processor Block
• Mic/Line Input Signal Chain
• Mixer
• Output Channels
MVC 121 Plus Operation
The MVC 121 Plus can be configured using a PC running Windows XP or better and the
DSP Configurator software (available on the included disc or at
www.extron.com ), or the
Extron SIS Simple Instruction Set using HyperTerminal or DataViewer.
The MVC 121 Plus is configured for immediate operation, with all inputs mixed to the
outputs. However, input gain must be set, especially for the microphone inputs, before the
device will function at optimal levels.
The front panel small rotary encoders control level at the mix-points, not at the input gain
stage. Mix-points have a gain range of −24 dB to +12 dB. In some instances, the mix-point
gain range may be too great, allowing for settings that are too loud or too soft, and in
some instances the loudest settings may cause feedback or clipping. Soft limits can be
applied to the mix-point gain ranges, limiting the gain range for smoother operation.
Mix-point levels and Variable output levels may be set using the front panel rotary
controls. Input gain should be set using the DSP Configurator software, which provides
metering in dBFS that will assist you in configuring the device for optimal operation. The
MVC 121 Plus is a digital device, therefore optimal operating levels are close to 0 dBFS
without ever going over 0 dBFS (0 dB “full scale” on the input or output meters). Levels
above 0 dBFS cause clipping, which is always audible on a digital device.
Soft limits may also be applied to the Variable output, which will prevent the volume from
becoming too loud or too soft. The Fixed output, while not affected by the front panel
Volume control, does include a gain stage that is configured with the DSP Configurator
software. The Fixed output gain setting can be used to optimize the level going to, for
example, a recording device or ALS system.
Lastly, the input signal chain provides a Filter/EQ block. Use these processors to optimize
the tonal quality of your source devices. A high-pass filter applied to a microphone will
reduce thumps and pops, while the parametric EQ can be used to give a talker more
presence, or to remove frequencies that are likely to cause feedback.
MVC 121 Plus • Operation 11