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Terminology
Mic Input Socket
Standard 3-Pin XLR socket wired as Pin 1=Chassis, Pin 2=hot (+), Pin 3=Cold (-).
Gain Control
This adjusts the gain of the input amplifier to match the signal level of the input. The gain is varied from –6dB
attenuation) to +63dB for signals plugged in to the xlr socket (Mic Input) and –10dB to +26dB for signals plugged into
the Line input jack.
100Hz High Pass Filter
The Hi-pass filter is used for reducing pop noise and rumble from microphone signals. It is a 2-pole (12dB per octave)
filter with a corner frequency set at 100Hz. The filter affects signals from both Mic XLR and Line jack socket.
HF EQ
The HF (High Frequency) equalizer affects the frequency response of the higher audible frequencies.
MF EQ
The MF (Mid Frequency) equalizer affects the middle of the audible frequency range. The frequency graduations on
the sweep control are the centre frequencies of the EQ. The range has been carefully chosen to cover “boomy”
frequencies around 120Hz to 250Hz which may need cutting back, or a lift at 2 to 3kHz may be required for
microphone intelligibility.
LF EQ
The LF (Low Frequency) equalizer affects the response at the low end of the audio range.
PAN
The pan control adjusts how the signal from the mono input channel is shared between the left and right sides of the
PGM bus and the MIX B bus. Set to the mid position, equal amounts of signal are fed to left and right, with pan set to
L, none is sent to the Right bus.
ON Switch
This mechanically latching switch operates the channel mute circuitry, turning the signal to the PGM, MIX B and Aux
buses on or off. The switch is illuminated green when pressed.
Fader
The 100mm fader controls the level of the channel signal to the left & right PGM bus, MIX B bus and post fade Aux.
CRM Speakers level
Adjusts the level of the signal to the control room speaker outputs from off (fully attenuated) to unity gain.
Control Room Phones level
Adjusts the level of the operators’ control room headphones from off (fully attenuated) to maximum. The
headphone amplifier has a gain of 12dB.
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Operating Levels
