BBE EQA131 Front And Rear Panel Controls, Power Switch, Filter Level Controls, Bypass Switch

FRONT AND REAR PANEL CONTROLS

1. Power Switch

This switch is pressed to turn power ON, pressing the switch again turns the power off.

Always turn on your equalizer BEFORE your power amplifiers are turned on, and always turn off equalizer AFTER your power amplifiers have been turned off.

2. Filter Level Controls

Each of these sliders control the output level of each of the 31 (or 15) bandpass filters.

Center detent position is grounded for guaranteed flat response.

3. Filter Range Switch & Indicators

The gain range of the filter sliders is switchable (as a group) from +/-6dB to +/-12dB for maximum boost/cut capability. When this switch is in the "OUT MOST" position, at 6dB, the green LED will illuminate. When it is in the "IN MOST" position, at 12dB, the yellow LED will illuminate.

4. Bypass Switch

When it is the "IN MOST" position, equalizer is bypassed. Its associated LED indicates status. (See 8. Bypass indicator)

5. HPF Frequency Control (EQA 231 and EQA131)

To cut down unwanted signal, this control determines the roll-off frequency of the High-Pass Filter. The roll-off frequency can be adjusted from 10Hz to 250Hz by turning this knob. Because of its high roll-off slope, the HPF can be efficiently used to cut down the "HUM" from preceding instruments, or to prevent low-frequency resonance.

6. LPF Frequency Control (EQA 231 and EQA131)

To cut down unwanted signal this control determines the roll-off frequency of the Low-pass filter. The roll-off frequency can be adjusted from 3KHz to 40KHz by turning the knob. Because of its high roll-off slope, this LPF can be efficiently used to cut down the high- frequency noise from preceding instruments, or especially used to roll-off high-frequency sound to obtain a more natural sound in acoustic situations.

7. Level Control

This controls the level of the incoming signal. Turn this control down if the PEAK LED illuminates steadily. Unity gain can be set by turning this knob its center detent position.

8. Bypass Indicator

When the green LED is illuminated this indicates that the unit or channel is in the bypass mode. Signal is routed directly from the input to the output without passing through any circuit (often referred to as "hard-wire bypass").

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