Inter-m EQ-2131 Operating Manual page 8

GRAPHIC EQUALIZER
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. A single Peak Warning
Indicator is provided for the EQ-2131 and two are provided on the EQ-2231 and EQ-2215, one for each of
the two channels (Channel A and Channel B).
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. A single RANGE switch is provided for the EQ-2131 and two are provided on
the EQ-2231 and EQ-2215, one for each of the two channels (Channel A and Channel B). 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. A single CUT
ONLY switch is provided for the EQ-2131 and two are provided on the EQ-2231 and EQ-2215, one for
each of the two channels (Channel A and Channel B).
6. HIGH PASS FILTER
The position of this switch determines if the 80Hz High Pass Filter is applied to the signal. The switch will illuminate
when the High Pass Filter is engaged. A single HPF switch is provided on the EQ-2131 and two are provided on
the EQ-2231 and EQ-2215, one for each of the two channels (Channel A and Channel B). This feature is
effective at removing rumble or other low frequency information (below 80Hz) which may be undesirable.
7. BYPASS SWITCH
The position of this switch determines whether the product operates normally or allows the signal to bypass
all equalization settings and pass through unaffected. The switch will illuminate when it is in the BYPASS
mode. A single BYPASS switch is provided on the EQ-2131 and two are provided on the EQ-2231 and EQ-
2215, one for each of the two channels (Channel A and Channel B). In the event of a loss of power, the
product will default to BYPASS mode allowing the signal to pass.
8. POWER SWITCH
The position of this switch determines whether the power is ON or OFF. The power-on status is indicated by
the LED inside the switch. In the OFF position the input(s) are hard bypassed to the output(s) to allow the
signal to pass through unaffected as it does in BYPASS.
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EQ-2131/2231/2215