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DUAL 31- BAND GRAPHIC EQUALIZER
5
EQ-2231A
Front Panel
Front Panel
1. EQ BOOST / CUT CONTROL
These 45mm sliders control the amount of boost or cut applied to the indicated center frequency.
2. INPUT GAIN CONTROL
The position of the Input Gain slider determines the overall signal to the circuitry. The “0” position of each slider
indicates the position where no cut or boost occurs. This position (also known as unity gain) is the optimum
position.
3. PEAK WARNING INDICATOR
This LED illuminates red whenever the corresponding input signal is within 6dB of clipping. During normal
operation, the Peak Warning Indicator will remain off or only rarely illuminate.
4. RANGE SWITCH
The position of this switch determines if the slider controls operate over a ±6dB or a ±12dB range in the
boost/cut mode. In the CUT ONLY mode, the position of this switch changes the adjustments from -12dB to -
24dB. In most cases, the ±6dB (-12dB in cut only) range is sufficient. Excessive adjustments may indicate a
problem elsewhere in the system that requires attention. The RANGE switch will illuminate when engaged,
effectively doubling the normal range of the slider controls.
5. CUT ONLY SWITCH
The position of this switch determines whether the corresponding slide controls perform a boost/cut or cut
only function. The switch will illuminate when the switch is in the CUT ONLY mode. In this mode, the “0”
position of the sliders is at the top of the range and any adjustment of the sliders will only attenuate the level
as indicated by the red CUT ONLY graphics. Usually -12dB of attenuation is sufficient. However the RANGE
switch can be employed to provide up to -24dB of attenuation if more than -12dB is needed.
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