Neumann KH 120 A - Active Studio Monitor User Manual

1. Introduction and Overview

The Neumann KH 120 A is a compact, high-performance active studio monitor designed for professional audio applications. It serves effectively as a near-field loudspeaker or as a rear loudspeaker in larger multi-channel systems. Developed using advanced acoustic and electronic simulation technologies, the KH 120 A delivers reference-quality sound reproduction, making it ideal for critical listening, mixing, and mastering tasks in music, broadcast, project, and post-production studios.

Key features include a Mathematically Modeled Dispersion™ (MMD™) waveguide for smooth off-axis response, flexible acoustical controls for environmental adaptation, and bi-amplified Class-AB analog amplifiers ensuring exceptional transient response and dynamic range. Its robust aluminum cabinet minimizes resonances and provides efficient heat dissipation, while wide-range input gain and output level controls allow for easy integration with various signal sources.

This image displays the front of the Neumann KH 120 A studio monitor, highlighting its compact design and the distinct woofer and tweeter components.

2. What's in the Box

Upon unboxing your Neumann KH 120 A Studio Monitor, please verify that all the following components are included:

• Neumann KH 120 II Studio Monitor
• 2 Mains Cables
• 4 Self-adhesive feet
• Operating Manual (This document)
• Quick-start guide

3. Key Features

The Neumann KH 120 A Studio Monitor incorporates several advanced features designed for superior audio performance:

• Bi-amplified Design: Features 50W + 50W two-way monitoring with a 5.25-inch long-throw woofer and a 1-inch titanium fabric dome tweeter.
• Precision Manufacturing: Manufactured to ±0.5dB tolerance, ensuring perfectly matched pairs for superb sound staging and imaging.
• Robust Enclosure: Compact and rugged, non-resonant aluminum enclosure effectively eliminates unwanted cabinet-induced coloration.
• Wide Frequency Response: Offers a free-field frequency response of 52 Hz - 21 kHz, ±3 dB.
• Mathematically Modeled Dispersion™ (MMD™) Waveguide: Provides smoother off-axis response for a wider sweet spot.
• Acoustical Controls: Four-position bass, low-mid, and treble controls allow for precise tailoring of the output to suit various listening environments.
• Neumann Logo Indicator: A two-color and dimmable Neumann logo displays the operational status and activation of the extensive protection system.
• Front Panel Ports: Large front panel ports reduce bass compression and facilitate easier mounting in tight spaces.

4. Setup

Proper setup of your KH 120 A monitors is crucial for optimal performance. Consider the following guidelines:

• Placement: Position the monitors as a near-field setup, typically 1 to 2 meters from the listening position, forming an equilateral triangle with the listener. Ensure they are at ear height.
• Input Connections: Connect your audio source to the balanced XLR input on the rear panel of each monitor. The KH 120 A supports various input formats including XLR, RCA, and AES67.
• Power Connection: Use the provided mains cables to connect the monitors to a suitable power outlet.
• Acoustical Controls: Utilize the four-position switches on the rear panel to adjust Bass, Low-Mid, and Treble levels. These controls help compensate for room acoustics and speaker placement. Refer to the "Operating" section for detailed adjustment guidelines.
• Input Gain and Output Level: Adjust the wide-range input gain and output level controls to match the signal source and desired listening volume.
• Mounting: An extensive range of optional mounting hardware is available for versatile installation. Ensure any mounting solution is stable and secure.

The back panel of the KH 120 A monitor, featuring the power switch, power input, XLR input, and various acoustic control switches for bass, low-mid, and treble adjustments.

5. Operating

Once set up, operating the Neumann KH 120 A is straightforward:

• Power On/Off: Use the power switch located on the rear panel to turn the monitor on or off.
• Neumann Logo: The illuminated Neumann logo on the front indicates the monitor's status. A white light signifies normal operation, while a red light may indicate activation of the protection system (e.g., thermal limiting or peak limiting).
• Acoustical Control Adjustments:
  • Bass: Adjusts low-frequency response (0, -2.5, -5, -7.5 dB). Useful for compensating for room modes or proximity to walls.
  • Low-Mid: Adjusts lower-mid frequency response (0, -1.5, -3, -4.5 dB). Helps in controlling muddiness or clarity in the vocal range.
  • Treble: Adjusts high-frequency response (+1, 0, -1, -2 dB). Can be used to fine-tune brightness or reduce harshness.

  Experiment with these settings to achieve the most accurate and balanced sound for your specific listening environment.

• Output Level: The output level switch (94, 100, 108, 114 dB SPL) allows you to set the maximum sound pressure level (SPL) at 1 meter, providing flexibility for different room sizes and listening preferences.
• Input Gain: The input gain knob (0 dBu to -15 dBu) fine-tunes the input sensitivity to match the output level of your audio interface or mixer, preventing clipping and ensuring optimal signal-to-noise ratio.

6. Maintenance

To ensure the longevity and optimal performance of your Neumann KH 120 A Studio Monitors, follow these maintenance recommendations:

• Cleaning: Use a soft, dry cloth to clean the cabinet. For stubborn marks, a slightly damp cloth with mild soap can be used, but ensure no liquid enters the speaker grilles or ports. Avoid abrasive cleaners or solvents.
• Environment: Operate the monitors in a stable environment, away from direct sunlight, excessive heat, humidity, or dust. Ensure adequate ventilation around the rear heat sinks.
• Handling: Handle the monitors with care. Avoid dropping them or subjecting them to strong impacts.
• Cables: Periodically check all cables for wear and tear. Replace any damaged cables to prevent signal loss or electrical hazards.

7. Troubleshooting

If you encounter issues with your Neumann KH 120 A Studio Monitors, consider the following common troubleshooting steps:

• No Sound:
  • Check power connections and ensure the power switch is on.
  • Verify audio cable connections (XLR) at both the monitor and the audio source.
  • Ensure the input gain and output level controls are not set to minimum.
  • Check the audio source (e.g., audio interface, mixer) for proper output levels and settings.
• Distorted Sound:
  • Reduce the input gain or output level to prevent clipping. The Neumann logo turning red indicates the protection system is active due to high signal levels.
  • Check the audio source for excessive output levels.
  • Ensure cables are not damaged or improperly connected.
• Hum or Noise:
  • Ensure all audio connections are balanced (XLR).
  • Check for ground loops. Try connecting all audio equipment to the same power strip.
  • Move power cables away from audio signal cables.
• Uneven Sound (Stereo Pair):
  • Verify that the acoustical control settings (Bass, Low-Mid, Treble) are identical on both monitors.
  • Ensure both monitors are positioned symmetrically in your listening space.

If problems persist after attempting these steps, please refer to the "Warranty and Support" section for further assistance.

8. Specifications

This image illustrates the physical dimensions of the KH 120 A monitor, with measurements for its height (16.5 inches), width (11.1 inches), and depth (14.3 inches).

9. Warranty and Support

The Neumann KH 120 A Studio Monitor comes with a Limited Warranty. For specific terms and conditions of your warranty, please refer to the warranty documentation included with your product or visit the official Neumann website.

For technical support, service, or any inquiries regarding your Neumann product, please contact Neumann customer support directly. You can typically find contact information on the Neumann website or in the quick-start guide provided with your monitor.

When contacting support, please have your product model (KH 120 A) and serial number ready. The serial number is usually located on the rear panel of the monitor.