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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BBE EQA131, EQA-231, EQA215 manual Front and Rear Panel Controls, Power Switch
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EQA215, EQA131, EQA-231 specifications

The BBE EQA-231, EQA-131, and EQA-215 are advanced audio processing units designed for both professional and home studio applications. Renowned for their exceptional sound quality, these equalizers cater to a variety of needs, ensuring that audio engineers and musicians have the tools necessary for optimal sound shaping.

The BBE EQA-231 is a 31-band graphic equalizer, offering a comprehensive range of frequency adjustments. It features a frequency response of 20 Hz to 20 kHz, allowing for precise manipulation of sound across the entire audible spectrum. The EQA-231 utilizes BBE's proprietary Sonic Maximizer technology, which enhances the clarity and definition of audio. This technology acts as a harmonic enhancer, improving the listening experience by providing more punch and depth to mixes. Its dual-channel design ensures versatility, making it suitable for both stereo and mono applications.

The EQA-131 is a 15-band graphic equalizer, targeted at those who require a simpler yet effective solution for sound equalization. With a frequency range similar to that of the EQA-231, the EQA-131 allows users to control the sound effectively without overwhelming complexity. The unit boasts low-noise operational capabilities and effective control over feedback, making it ideal for live sound reinforcement as well as studio use.

The EQA-215, an advanced model, combines features from both the EQA-231 and EQA-131, providing a wide spectrum of controls with 15 bands per channel. Like its counterparts, the EQA-215 uses BBE’s Sonic Maximizer technology, enriching the audio signal and ensuring it retains clarity even at higher output levels. Additionally, its rugged design is tailored for road use, ensuring durability and reliability during live performances.

In summary, BBE's EQA series stands out for its advanced audio engineering, high-quality components, and user-friendly interfaces. Each model caters to different user preferences and requirements while maintaining the high standards of audio fidelity that BBE is known for. Whether for studio mixing, live sound applications, or personal use, the EQA-231, EQA-131, and EQA-215 provide powerful solutions for artists and audio professionals alike. These equalizers are essential tools for achieving balanced, clear, and dynamic sound in any setting.
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