Behringer NU3000 Power Amplifier User Manual

1. Introduction

This manual provides essential information for the safe and efficient operation of your Behringer NU3000 Ultra-Lightweight, High-Density 3000 Watt Power Amplifier. Please read this manual thoroughly before operating the device to ensure proper usage and to prevent damage.

2. Important Safety Instructions

WARNING: To reduce the risk of electric shock, do not remove the cover (or back). No user-serviceable parts inside. Refer servicing to qualified service personnel.

• 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

The Behringer NU3000 Power Amplifier incorporates advanced technology for reliable and powerful audio performance. Key features include:

• Delivers 2 x 1500 Watts into 2 Ohms; 2 x 880 Watts into 4 Ohms; 3000 Watts into 4 Ohms (bridge mode) and weighs less than 7 lbs/3.3 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 Subwoofer/Satellite crossover for perfect subwoofer operation.

4. Setup

4.1 Unpacking

Carefully unpack your NU3000 amplifier. Inspect the unit for any signs of damage that may have occurred during transit. If damage is found, contact your dealer immediately. Retain the original packing materials for future shipping or storage.

4.2 Rack Mounting

The NU3000 is designed for standard 19-inch rack mounting. Ensure adequate ventilation around the unit. Do not block the front or rear ventilation openings.

4.3 Connections

Before making any connections, ensure the amplifier is powered off and disconnected from the mains supply.

Figure 4.3.1: Rear panel of the Behringer NU3000 Power Amplifier. This view displays the various input and output connectors, including XLR and 1/4-inch TRS inputs, speakON outputs, and the power inlet, along with mode switches and crossover controls.

4.3.1 Input Connections

Connect your audio source (mixer, preamplifier) to the INPUTS on the rear panel using balanced XLR or 1/4-inch TRS cables. The NU3000 features two input channels (CH A and CH B).

4.3.2 Output Connections

Connect your loudspeakers to the OUTPUTS using speakON connectors. Ensure your speakers' impedance matches the amplifier's output capabilities (2 Ohms, 4 Ohms, or 8 Ohms per channel, or 4 Ohms in bridge mode). Refer to the specifications for detailed impedance ratings.

4.3.3 Power Connection

Connect the supplied AC power cord to the POWER inlet on the rear panel and then to a grounded mains outlet. Ensure the voltage matches your local power supply.

5. Operating the NU3000

5.1 Front Panel Controls

Figure 5.1.1: Front panel of the Behringer NU3000 Power Amplifier. This image highlights the individual gain controls for Channel A and Channel B, along with the power button and LED indicators for signal, limit, and protection status.

• POWER Button: Press to turn the amplifier on or off.
• CH A / CH B GAIN Controls: Adjust the output level for each channel. Rotate clockwise to increase volume, counter-clockwise to decrease.
• SIGNAL LEDs: Indicate the presence of an audio signal.
• LIMIT LEDs: Illuminate when the output signal is approaching clipping. Reduce the gain if these LEDs are constantly lit.
• PROTECT LEDs: Indicate that the amplifier's protection circuitry is active due to overheating, short circuits, or other faults.

5.2 Rear Panel Controls and Switches

Refer to Figure 4.3.1 for the location of these controls.

• MODE Switch: Selects the operating mode:
  • DUAL: Each channel operates independently.
  • PARALLEL: Input A feeds both channels, which operate independently.
  • BRIDGE: Both channels combine to drive a single, higher-power output.
• CROSSOVER Switch: Activates the built-in subwoofer/satellite crossover.
  • FULLRANGE: Full frequency range output.
  • LF (Low Frequency): Output optimized for subwoofers.
  • HF (High Frequency): Output optimized for satellite speakers.

5.3 Basic Operation

1. Ensure all connections are secure and correct.
2. Set the CH A and CH B GAIN controls to their minimum (fully counter-clockwise) position.
3. Power on your audio source (mixer, etc.).
4. Press the POWER button on the NU3000 front panel. The POWER LED should illuminate.
5. Slowly increase the GAIN controls for CH A and CH B to the desired listening level. Monitor the LIMIT LEDs to avoid clipping.
6. When finished, reduce the GAIN controls to minimum, then power off the amplifier.

6. Maintenance

6.1 Cleaning

Clean the unit regularly with a soft, dry cloth. Do not use liquid cleaners or solvents. Ensure ventilation grilles are free from dust and debris to maintain proper airflow.

6.2 Storage

If storing the amplifier for an extended period, disconnect it from power, clean it, and store it in a dry, dust-free environment, preferably in its original packaging.

7. Troubleshooting

This section addresses common issues you might encounter with your NU3000 amplifier.

8. Specifications

Technical specifications for the Behringer NU3000 Power Amplifier:

9. Warranty and Support

For detailed warranty information and technical support, please refer to the official Behringer website or contact your local Behringer dealer. Keep your purchase receipt as proof of purchase for any warranty claims.