1. Product Overview
The Behringer 676 is a professional-grade tube preamplifier and limiting amplifier designed to enhance audio signals with warmth, clarity, and dynamic control. It features a vacuum tube preamp, FET-style compressor, and Midas transformers, making it suitable for a wide range of audio applications, from studio recording to live sound.
2. Setup Guide
Before operating your Behringer 676, please follow these setup instructions carefully to ensure proper functionality and safety.
2.1 Unpacking
- Carefully remove the unit from its packaging.
- Inspect the unit for any signs of damage during transit. If damage is found, contact your dealer immediately.
- Retain the original packaging for future transport or storage.
2.2 Connections
Ensure the unit is powered off before making any connections.
- Audio Input: Connect your microphone, instrument (e.g., guitar), or line-level source to the appropriate input jacks on the rear panel. The front panel offers HI-Z input for instruments.
- Audio Output: Connect the main output of the 676 to your audio interface, mixer, or power amplifier using balanced XLR or TRS cables.
- Power: Connect the supplied AC power cable to the unit's power inlet and then to a suitable AC power outlet.
3. Operating Instructions
This section details the functions of the front panel controls for the Behringer 676.
3.1 Preamplifier Section (Left Panel)
- GAIN Knob: Adjusts the input gain from -10 to +10. Use this to set the initial signal level.
- Input Select Switches: Selects the input type.
- MIC: For microphone inputs (impedance options: 500, 2.0K).
- LINE: For line-level inputs (impedance: 47K).
- HI-Z: For high-impedance instruments like guitars (impedance: 2.2M).
- PAD Switch: Engages a -15dB attenuation pad for hot input signals.
- OUT Ø / IN Ø Switches: Controls the phase of the output signal. OUT Ø inverts the phase, IN Ø maintains normal phase.
- LEVEL Knob: Adjusts the output level of the preamplifier section from 0 to 10.
3.2 Equalizer Section (Middle-Left Panel)
- HIGH Knob: Boosts or cuts high frequencies from -9 to +9. Selectable frequencies include 4.5K, 7K, and 10K.
- LOW Knob: Boosts or cuts low frequencies from -9 to +9. Selectable frequencies include 70, 100, and 200.
3.3 Limiting Amplifier Section (Right Panel)
- ATTACK Knob: Adjusts the time it takes for the compressor to react to signals above the threshold, from SLOW to FAST.
- RELEASE Knob: Adjusts the time it takes for the compressor to return to its normal state after the signal falls below the threshold, from SLOW to FAST.
- INPUT Knob: Controls the signal level entering the compressor from 0 to 10.
- OUTPUT Knob: Controls the final output level of the limiting amplifier from 0 to 10.
- METER Switch: Selects what the VU meter displays:
- PRE: Input level before compression.
- GR: Gain Reduction (amount of compression applied).
- COMP: Output level after compression.
- RATIO Knob: Sets the compression ratio, from 1 (no compression) to ALL (limiting). Other options include 4, 8, 12, 20.
- VU Meter: Displays the selected signal level or gain reduction.
3.4 Global Controls (Middle Panel)
- JOIN/SPLIT Switch: Determines if the preamplifier and limiting amplifier sections operate independently (SPLIT) or as a combined unit (JOIN).
- ON/48 V Switch: Activates the unit's power (ON) and provides 48 V phantom power for condenser microphones.
- POWER Switch: Turns the unit on or off.
4. Maintenance
Proper maintenance ensures the longevity and optimal performance of your Behringer 676.
- Cleaning: Use a soft, dry cloth to clean the exterior of the unit. Avoid abrasive cleaners or solvents.
- Ventilation: Ensure adequate ventilation around the unit to prevent overheating. Do not block ventilation openings.
- Storage: When not in use for extended periods, store the unit in a cool, dry place, preferably in its original packaging.
- Tube Replacement: The vacuum tube inside the unit has a finite lifespan. If you notice a degradation in sound quality, consult a qualified technician for tube replacement.
5. Troubleshooting
This section provides solutions to common issues you might encounter with your Behringer 676.
| Problem | Possible Cause | Solution |
|---|---|---|
| No power | Power cable disconnected; Power switch off; Blown fuse | Check power cable connection; Ensure power switch is ON; Replace fuse if necessary (consult manual for fuse type). |
| No audio output | Incorrect input/output connections; Gain/Level knobs too low; Incorrect input selection | Verify all audio connections; Increase GAIN and LEVEL knobs; Ensure correct input (MIC/LINE/HI-Z) is selected. |
| Distorted audio | Input signal too hot; Gain/Level too high; Faulty cable | Engage PAD switch; Reduce GAIN or INPUT/OUTPUT levels; Try a different cable. |
| No phantom power | 48V switch off | Ensure the 48V switch is engaged. |
6. Technical Specifications
| Feature | Specification |
|---|---|
| Product Dimensions | 21.42 x 6.1 x 9.84 inches |
| Item Weight | 11.44 pounds |
| Item Model Number | 0838-ABC |
| Brand | Behringer |
| Compatible Devices | Guitar |
| Connectivity Technology | AUX |
| Number of Channels | 2 |
| Manufacturer | Behringer |
| Date First Available | March 13, 2025 |
7. Warranty and Support
Behringer products are designed for reliability and performance. For information regarding warranty coverage, product registration, or technical support, please refer to the official Behringer website or contact their customer service. Protection plans may also be available for extended coverage.
For the most up-to-date support resources, visit the official Behringer website: www.behringer.com
