SKP Pro Audio EQD 312, User Manual

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Dynamics / Master Control Dual 31 Band Graphic Equalizers
The Dynamics / Master control section of the EQD 312 occupies the left side of the front
panel and contains the Limiter, Expander, Filter, Gain Control, HI Q switch, Range switch,
Bypass, Channel Master A, AHC, Program LEDs, Preset switch, Store switch, Output
Level Meter for both channels.
The Graphic Equalizer section contains Range LED indicators, 31 EQ encoders for each
channel and the 31 HI Q Active LED Indicators.
DYNAMICS / MASTER CONTROL
Output Level Meter
The output of each channel of the EQD 312 can be monitored by way of dual twenty
segment LED meters contained in the Dynamics / Master section. These meters display
the output of channels A and B, respectively, from –42dBu to +22dBu.
Filter – High Pass / Low Pass
HIGH PASS FILTER
The High Pass filter control is variable from 10Hz to 410Hz. The High Pass filter is always
active. Signals above the user-selected frequency point go through, i.e. pass unaffected.
The variable filter control can be rotated fully counter-clockwise (10Hz) to effectively take
it out of the spectral range of audio.
LOW PASS FILTER
The Low Pass filter control is variable from 10kHz to 20kHz. The Low Pass Filter allows
signals below the user-selected frequency to pass. The 20kHz position on the variable
frequency control is located at the fully clockwise position and is labeled OFF. Intuitively
the OFF label is correct as the bandwidth of the EQD 312 is 20Hz to 20kHz, therefore,
selecting 20kHz allows all frequencies from 20kHz and below to pass through unaffected,
effectively turning the Low Pass Filter “off”.
Expander
The Extender of EQD 312 is provided to eliminate the system noise. The way to use this
function is: choose a threshold for downward extension action, and a ratio for extension.
Threshold: this threshold ranges from –10dBu to OFF
Ratio: from 1:1 to
∞ :1.
Limiter
A “Brick Wall” Limiter is available to each channel of the EQD 312. The limiter will protect
system components and listeners from destructive transient by providing an electronic
barrier which signals rising above the user-determined threshold will not be allowed to
cross.
THRESHOLD
The Threshold control for the Limiter is calibrated from 0dBu to OFF.
Gain control
A Gain control on each channel of the EQD 312 is the last controller in the signal path and
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