1. Introduction
This manual provides essential information for the safe and efficient operation of your Behringer NU4-6000 Ultra-Lightweight, High-Density, 6000-Watt 4-Channel Power Amplifier. Please read it thoroughly before use and retain it for future reference.
Key Features:
- Delivers 4 x 1600 Watts into 2 Ohms, 2 x 3000 Watts into 4 Ohms, weighing less than 12 lbs / 5.5 kg.
- Ultimate reliability through revolutionary cool-running High-Density Class-D technology with "near-zero" thermal buildup.
- Ultra-efficient switch-mode power supply for noise-free audio, superior transient response, and low power consumption.
- "Zero-Attack" limiters offer maximum output level with reliable overload protection.
- Built-in stereo crossover with low-cut, high-cut, and full range mode.
2. Setup
2.1 Unpacking and Placement
Carefully unpack the amplifier and inspect it for any signs of damage. Place the amplifier in a well-ventilated area, preferably in a standard 19-inch equipment rack. Ensure adequate airflow around the unit to prevent overheating.
2.2 Front Panel Overview
- Power Switch: Turns the amplifier ON/OFF.
- Channel Gain Controls: Adjust the input sensitivity for each of the four channels.
- Signal LEDs: Indicate the presence of an input signal.
- Clip LEDs: Illuminate when the output signal is clipping, indicating potential distortion. Reduce the input level if these LEDs light up frequently.
- Power LEDs: Indicate the operational status of each channel.
2.3 Rear Panel Overview and Connections
- Inputs (CH A, CH B, CH C, CH D): XLR and 1/4-inch TRS combo jacks for connecting audio sources.
- Outputs (CH A, CH B, CH C, CH D): Speakon connectors for connecting speakers.
- Mode Switches: Select between Stereo, Parallel, or Bridged operation for each pair of channels (A/B and C/D).
- Crossover Switches: Select between Full Range, Low-Cut (for subwoofers), or High-Cut (for top speakers) for each pair of channels.
- Power Input: Standard IEC power connector.
- Circuit Breaker: Provides overload protection.
2.4 Connecting Audio Sources and Speakers
Ensure the amplifier is turned OFF before making any connections.
- Input Connections: Connect your audio source (mixer, preamplifier, etc.) to the XLR or 1/4-inch TRS combo inputs on the rear panel. Use balanced cables for optimal noise rejection.
- Speaker Connections: Connect your passive speakers to the Speakon outputs. Ensure correct polarity (+ to + and - to -).
- Mode Selection: Use the mode switches to select the desired operation:
- Stereo: Each channel operates independently, driving a separate speaker.
- Parallel: Input signal from Channel A is sent to both Channel A and Channel B outputs (and similarly for C/D), allowing both channels to drive speakers with the same mono signal.
- Bridged: Combines the power of two channels (A+B or C+D) to drive a single, higher-power speaker (typically a subwoofer). Ensure the speaker impedance is compatible with bridged mode (usually 4 or 8 Ohms).
- Crossover Settings: Use the crossover switches to optimize the frequency response for your speakers:
- Full Range: Sends the full audio spectrum to the speakers.
- Low-Cut: Filters out low frequencies, ideal for top speakers when used with subwoofers.
- High-Cut: Filters out high frequencies, ideal for subwoofers.
2.5 Setup Demonstration Videos
Video 1: General setup guide for Rockville RPA series amplifiers. While a different model, the connection principles for mixers and speakers are similar and can provide helpful visual guidance.
Video 2: Setup instructions for Rockville D Series Amplifiers. This video demonstrates various connection types and modes that are applicable to the Behringer NU4-6000.
3. Operating Instructions
3.1 Powering On and Initial Level Setting
- Ensure all gain controls on the amplifier are set to their minimum position.
- Turn on your audio source equipment first.
- Flip the Power Switch on the Behringer NU4-6000 to the ON position. The Power LEDs should illuminate.
- Slowly increase the gain controls for each channel until the desired volume is reached. Monitor the Signal and Clip LEDs to avoid distortion.
3.2 Understanding "Zero-Attack" Limiters
The "Zero-Attack" limiters are designed to provide maximum output level with reliable overload protection. They automatically detect when the signal is approaching clipping and dynamically reduce the gain to prevent distortion and protect your speakers.
3.3 Class-D Technology and Switch-Mode Power Supply
The NU4-6000 utilizes revolutionary High-Density Class-D amplifier technology, which ensures cool-running operation with "near-zero" thermal buildup. Coupled with an ultra-efficient switch-mode power supply, the amplifier delivers noise-free audio, superior transient response, and low power consumption, making it ideal for extended use.
3.4 Product Overview Video
Video 3: Product video for Rockville D Series Amps. This video provides a general overview of amplifier features and operation, which can be helpful for understanding the NU4-6000's functionalities.
4. Maintenance
To ensure the longevity and optimal performance of your Behringer NU4-6000 amplifier, follow these maintenance guidelines:
- Cleaning: Regularly clean the exterior of the amplifier with a soft, dry cloth. Avoid using abrasive cleaners or solvents. Ensure ventilation grilles are free from dust and debris to maintain proper airflow.
- Ventilation: Always operate the amplifier in a well-ventilated environment. Do not block the ventilation openings. Overheating can severely damage the unit.
- Power Cord: Inspect the power cord periodically for any damage. Replace immediately if frayed or broken.
- Storage: When not in use for extended periods, store the amplifier in a cool, dry place, away from direct sunlight and extreme temperatures.
5. Troubleshooting
If you encounter issues with your Behringer NU4-6000, refer to the following common troubleshooting steps:
- No Power:
- Check if the power cord is securely connected to both the amplifier and a working power outlet.
- Verify that the power outlet is active.
- Check the circuit breaker on the rear panel; reset if tripped.
- No Sound:
- Ensure all audio input and speaker output cables are correctly and securely connected.
- Verify that the input source is active and sending a signal.
- Check the gain controls on the amplifier; ensure they are not set to minimum.
- Confirm that the correct mode (Stereo, Parallel, Bridged) is selected for your setup.
- Distorted Sound / Clip LED On:
- Reduce the input gain on the amplifier or the output level from your audio source.
- Ensure your speakers are correctly matched to the amplifier's impedance and power output.
- Overheating:
- Ensure the amplifier has adequate ventilation and that no vents are blocked.
- Check speaker impedance; operating with too low an impedance can cause overheating.
- Reduce the overall volume or continuous high-power operation.
If the problem persists after trying these steps, please contact Behringer customer support.
6. Specifications
| Specification | Value |
|---|---|
| Model | NU4-6000 |
| Output Power (2 Ohms) | 4 x 1600 Watts |
| Output Power (4 Ohms) | 2 x 3000 Watts |
| Amplifier Type | Class-D |
| Power Supply | Switch-Mode |
| Item Weight | 12.35 pounds (5.6 kg) |
| Product Dimensions | 19.02 x 12.91 x 3.5 inches (483 x 328 x 89 mm) |
| Built-in Crossover | Yes (Low-Cut, High-Cut, Full Range) |
| Limiters | "Zero-Attack" Limiters |
7. Warranty and Support
Behringer products are designed for reliability and performance. For detailed warranty information, please refer to the warranty card included with your product or visit the official Behringer website. If you require technical support, service, or have any questions regarding your NU4-6000 amplifier, please contact Behringer customer support through their official channels.
