User Manual
Section 2 - Operating Controls
Front Panels
131s- Single Channel 31 Band Graphic EQ |
215s- Dual Channel 15 Band Graphic EQ |
231s- Dual Channel 31 Band Graphic EQ
Input Gain Control
This control sets the signal level to the equalizer. It is capable of
EQ Bypass
This switch removes the graphic equalizer section from the signal path. The BYPASS switch does not, however, affect the INPUT GAIN, or LOW CUT filters.
EQ Bypass LED
This red LED lights when the EQ is in bypass mode. Note that bypass mode only effects the graphic equalizer section of the 2 Series EQs. The input gain and and low cut con- trols remain unaffected when the EQ is bypassed.
Boost/Cut Range Selection Switch and LEDs
This switch selects which of the two boost/cut ranges the equalizer will use, either ±6 dB or ±12 dB. The red LED lights when the ±12 dB range is selected.
Output Level Bar Graph
These four LEDs indicate output level of the equalizer. The red LED is 3 dB below clip- ping and is marked as +18 dBu. It monitors the level at the output of the equalizer after all other processing.
Clip LED
This LED lights whenever any internal signal level reaches 3 dB below clipping which may occur when any of the following happen: 1) the input signal is “hotter” than +18 dBu, 2) excessive gain is applied by the input gain control, or 3) excessive boost is applied using the frequency sliders.
Frequency Band Slider Controls
Each one of these slider potentiometers will boost or cut at its noted frequency by ±6 dB or ±12 dB, depending upon the position of the BOOST/CUT RANGE switch. When all
the sliders are in the center detented position the output of the equalizer is flat. The
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