Behringer Ultragraph Pro FBQ3102 31-Band Stereo Graphic Equalizer User Manual

1. Introduction

The Behringer Ultragraph Pro FBQ3102 is a professional 31-band stereo graphic equalizer designed for both live sound and studio applications. It features a unique FBQ Feedback Detection System, a dedicated mono subwoofer output with adjustable crossover frequency, and sweepable high and low cut filters for each channel. This manual provides essential information for the proper setup, operation, and maintenance of your FBQ3102.

2. Important Safety Instructions

• Read these instructions.
• Keep these instructions.
• Heed all warnings.
• Follow all instructions.
• Do not use this apparatus near water.
• Clean only with a dry cloth.
• Do not block any ventilation openings. Install in accordance with the manufacturer’s instructions.
• Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including amplifiers) that produce heat.
• Do not defeat the safety purpose of the polarized or grounding-type plug. A polarized plug has two blades with one wider than the other. A grounding-type plug has two blades and a third grounding prong. The wide blade or the third prong are provided for your safety. If the provided plug does not fit into your outlet, consult an electrician for replacement of the obsolete outlet.
• Protect the power cord from being walked on or pinched, particularly at plugs, convenience receptacles, and the point where they exit from the apparatus.
• Only use attachments/accessories specified by the manufacturer.
• Use only with the cart, stand, tripod, bracket, or table specified by the manufacturer, or sold with the apparatus. When a cart is used, use caution when moving the cart/apparatus combination to avoid injury from tip-over.
• Unplug this apparatus during lightning storms or when unused for long periods of time.
• Refer all servicing to qualified service personnel. Servicing is required when the apparatus has been damaged in any way, such as power-supply cord or plug is damaged, liquid has been spilled or objects have fallen into the apparatus, the apparatus has been exposed to rain or moisture, does not operate normally, or has been dropped.

3. Key Features

• Professional 31-band stereo graphic equalizer suitable for live and studio applications.
• Integrated FBQ Feedback Detection System for identifying critical frequencies and functioning as an audio analyzer.
• Dedicated mono subwoofer output with adjustable crossover frequency.
• Sweepable high and low cut filters on each channel to remove unwanted frequencies like floor rumble or tape hiss.
• Servo-balanced inputs and outputs with 1/4" TRS and gold-plated XLR connectors.
• High-accuracy 12-digit LED input/output metering and input gain control for precise level setting.
• Ultra low-noise audio operational amplifiers for outstanding sound performance.
• Relay-controlled hard bypass for automatic bypass in case of power loss and to prevent switch-on thumps.

4. Controls and Connectors

4.1 Front Panel Overview

The front panel provides access to all equalization controls, metering, and the FBQ system. Each of the two channels features 31 frequency bands, input/output level controls, and filter adjustments.

Image 4.1.1: Front view of the Behringer Ultragraph Pro FBQ3102 graphic equalizer. This image displays the dual 31-band faders, input/output level meters, gain controls, and the FBQ feedback detection system indicators for both stereo channels.

• Input/Output Level Meter: 12-segment LED display for monitoring signal levels.
• Input Gain Control: Adjusts the input sensitivity for each channel.
• Low Cut Filter: Sweeps from 10 Hz to 400 Hz, removing unwanted low frequencies.
• High Cut Filter: Sweeps from 2.5 kHz to 30 kHz, removing unwanted high frequencies.
• FBQ Switch: Activates the FBQ Feedback Detection System.
• Range Switch: Selects the fader boost/cut range (±6 dB or ±12 dB).
• Bypass Switch: Engages or disengages the equalizer effect for A/B comparison.
• Frequency Faders: 31 faders per channel for adjusting specific frequency bands. LEDs on these faders indicate feedback frequencies when FBQ is active.

4.2 Rear Panel Overview

The rear panel houses all audio input and output connections, as well as the power input.

Image 4.2.1: Rear view of the Behringer Ultragraph Pro FBQ3102, showing the power input, power switch, and various audio input and output connectors including XLR and 1/4" TRS for both channels, and the mono subwoofer output with its dedicated level and crossover frequency controls.

• Power Switch: Turns the unit on or off.
• AC Input: Standard IEC connector for the power cable.
• Inputs (Channel 1 & 2): Balanced XLR and 1/4" TRS connectors for audio input.
• Outputs (Channel 1 & 2): Balanced XLR and 1/4" TRS connectors for audio output.
• Sub Out: Mono XLR output for connecting a subwoofer.
• Subwoofer Level Control: Adjusts the output level of the subwoofer signal.
• Subwoofer Crossover Frequency Control: Sets the crossover point for the subwoofer output.

5. Setup

Proper setup ensures optimal performance and prevents damage to your equipment.

5.1 Power Connection

1. Ensure the FBQ3102's power switch is in the OFF position.
2. Connect the supplied AC power cable to the IEC input on the rear panel of the unit.
3. Plug the other end of the power cable into a suitable AC power outlet.

5.2 Audio Connections

The FBQ3102 features servo-balanced inputs and outputs, supporting both balanced XLR and 1/4" TRS connections. Unbalanced connections can also be used, with the unit automatically adjusting the signal level.

1. Connect the output of your mixing console or audio source to the INPUTS (Channel 1 and 2) on the rear panel of the FBQ3102 using XLR or 1/4" TRS cables.
2. Connect the OUTPUTS (Channel 1 and 2) of the FBQ3102 to the inputs of your power amplifier or next device in the signal chain using XLR or 1/4" TRS cables.
3. For subwoofer integration, connect the SUB OUT (XLR) to the input of your active subwoofer or subwoofer amplifier.

Note: Always make sure all audio connections are secure before powering on the unit.

6. Operating Instructions

6.1 Basic Equalization

1. Power on your audio system, ensuring the FBQ3102 is the last device to be turned on and the first to be turned off.
2. Set all frequency faders to the 0 dB (center) position.
3. Adjust the INPUT GAIN controls so that the input/output level meters show a healthy signal without clipping (red LEDs).
4. Use the RANGE switch to select either ±6 dB or ±12 dB adjustment range for the frequency faders. Start with ±6 dB for finer control.
5. Adjust the individual FREQUENCY FADERS to shape your sound. Boost frequencies to emphasize them or cut frequencies to reduce unwanted elements.
6. Use the BYPASS switch to compare the equalized sound with the original signal.

6.2 FBQ Feedback Detection System

The FBQ system helps identify and eliminate feedback frequencies quickly.

1. Press the FBQ switch to activate the feedback detection system.
2. When feedback occurs, the LEDs on the corresponding frequency faders will illuminate brightly, indicating the problematic frequencies.
3. Gently lower the faders of the illuminated frequencies until the feedback is eliminated.
4. In normal operation (FBQ active), the fader LEDs can also indicate frequency ranges with the highest energy levels, functioning as an audio analyzer.

6.3 High and Low Cut Filters

These filters help remove undesirable frequencies outside the main audio range.

• Turn the LOW CUT knob clockwise to gradually remove low-end rumble or unwanted bass frequencies.
• Turn the HIGH CUT knob counter-clockwise to remove hiss or harsh high frequencies.

6.4 Subwoofer Output Control

The dedicated subwoofer output allows for precise bass management.

• Adjust the SUBWOOFER LEVEL control to set the desired volume for your subwoofer.
• Use the SUBWOOFER CROSSOVER FREQUENCY control to define the upper frequency limit for the subwoofer signal. This ensures that only low frequencies are sent to the subwoofer, optimizing system performance.

6.5 Hard Bypass Function

The relay-controlled hard bypass ensures signal integrity and safety.

• In the event of power loss or faulty power delivery, the equalizer automatically switches to bypass mode, allowing the audio signal to pass through unaffected.
• During power-up, a slight delay prevents dangerous switch-on thumps, protecting connected equipment.

7. Maintenance

• Cleaning: Clean the unit with a soft, dry cloth. Do not use liquid cleaners or solvents.
• Ventilation: Ensure adequate ventilation around the unit to prevent overheating. Do not block ventilation openings.
• Storage: If storing the unit for an extended period, disconnect it from power and store it in a dry, dust-free environment.
• Servicing: Refer all servicing to qualified service personnel. Do not attempt to service the unit yourself.

8. Troubleshooting

9. Technical Specifications

Note: Specifications are subject to change without notice.

10. Warranty and Support

For detailed warranty information, terms, and conditions, please refer to the official Behringer website or the warranty card included with your product. For technical support, service, or spare parts, please contact your authorized Behringer dealer or visit the Behringer support page online.

You can find more information and support resources on the official Behringer website: www.behringer.com