Definitive Technology Descend DN8 8-inch Subwoofer User Manual

Introduction

This manual provides comprehensive instructions for the installation, operation, and maintenance of your Definitive Technology Descend DN8 8-inch Subwoofer. Please read this manual thoroughly before using your subwoofer to ensure optimal performance and longevity. The Descend DN8 is engineered to deliver powerful, clear bass for both movies and music, featuring advanced 3XR Architecture and a 500W peak Class D amplifier.

What's in the Box

Carefully unpack your subwoofer and verify that all items are present:

• Definitive Technology Descend DN8 Subwoofer
• Power Cord
• Quick Start Guide
• Registration Card

Product Overview

The Descend DN8 subwoofer incorporates innovative technologies to deliver exceptional bass performance:

• 3XR Architecture: Features an 8-inch driver coupled with two 8-inch pressure-coupled bass radiators, providing three times the bass-radiating surface area of a traditional ported 8-inch subwoofer. This design delivers deeper, louder, and clearer bass without port noise.
• 500W Peak Class D Amplifier: A powerful and efficient amplifier ensures dynamic, distortion-free bass reproduction.
• Compact Design: Engineered to fit into various living spaces while delivering substantial low-frequency output.

Setup

1. Placement

The placement of your subwoofer significantly impacts its performance. Experiment with different locations to find the best sound for your listening environment. Generally, placing the subwoofer in a corner can enhance bass output, but may also lead to a 'boomy' sound. Placing it along a wall can provide a more balanced response. Consider the following dimensions for placement:

2. Connections

The Descend DN8 offers versatile connection options for integration into your home theater system.

• LFE Input: For receivers or processors with a dedicated subwoofer output (LFE/SUB OUT), connect a single RCA cable (not included) from the LFE/SUB OUT of your receiver to the LFE IN on the subwoofer.
• Stereo Line Level RCA Inputs: For receivers or preamplifiers without a dedicated LFE output, connect RCA cables (not included) from the LEFT and RIGHT pre-out jacks of your receiver to the LEFT and RIGHT RCA inputs on the subwoofer.
• High Level Inputs: Connect speaker wires from your amplifier's speaker outputs to the High Level Inputs on the subwoofer. This method is often used for stereo music systems.

3. Power Connection

Once all audio connections are made, connect the supplied power cord to the subwoofer's power inlet and then to a wall outlet. Do not connect to a switched outlet on your receiver.

Operating

1. Power On/Off

The subwoofer features a power toggle switch with 'Auto On/Off' and 'DC Control' options:

• Auto On/Off: In this mode, the subwoofer will automatically power on when an audio signal is detected and enter standby mode after a period of inactivity.
• DC Control: If your receiver or processor has a 12V DC trigger output, connect it to the DC IN port on the subwoofer. This allows the subwoofer to power on and off in sync with your main system.

2. Controls

Adjust the following controls on the rear panel to integrate the subwoofer with your main speakers and room acoustics:

• Volume: Adjusts the overall output level of the subwoofer. Start with a moderate setting and fine-tune during calibration.
• Low Pass Filter: Controls the upper frequency limit of the subwoofer. Set this to blend smoothly with your main speakers. A common starting point is 80Hz, but it may vary depending on your main speakers' low-frequency extension. If using a receiver with bass management, set the low pass filter on the subwoofer to its maximum setting (or LFE if available) and manage crossover frequencies through your receiver.
• Phase Control (0/180°): Adjusts the phase of the subwoofer's output relative to your main speakers. Experiment with both 0° and 180° settings to achieve the most impactful and coherent bass. The correct setting will result in stronger, more defined bass at the listening position.

3. System Calibration

For optimal performance, it is highly recommended to calibrate your subwoofer with your audio system. Many modern AV receivers include automatic room correction systems (e.g., Audyssey MultEQ XT32) that can simplify this process. Follow your receiver's instructions for running its calibration routine after connecting the subwoofer.

Maintenance

To maintain the appearance and performance of your Descend DN8 Subwoofer:

• Cleaning: Use a soft, dry cloth to clean the cabinet. Avoid using harsh chemicals, solvents, or abrasive cleaners.
• Grille: The fabric grille can be gently vacuumed to remove dust.
• Placement: Ensure the subwoofer is placed on a stable surface and away from direct sunlight, heat sources, or excessive moisture.

Troubleshooting

If you encounter issues with your subwoofer, refer to the following common solutions:

• No Sound:
  • Ensure the power cord is securely connected and the subwoofer is powered on.
  • Check all audio cables for secure connections.
  • Verify that your receiver's subwoofer output is enabled and the volume is not muted.
  • Adjust the subwoofer's volume control.
• Weak or Undefined Bass:
  • Adjust the subwoofer's volume and low pass filter settings.
  • Experiment with the Phase Control (0° or 180°).
  • Try repositioning the subwoofer in the room.
  • If using a receiver, ensure its bass management settings are correctly configured.
  • Check the input sensitivity setting if available (some models may ship with a lower default setting, as noted in user reviews, adjust to 0 dB for full output).
• Boomy or Overpowering Bass:
  • Reduce the subwoofer's volume.
  • Adjust the low pass filter to a lower frequency.
  • Try moving the subwoofer away from corners or walls.
  • Run your receiver's room correction system if available.

Specifications

Warranty and Support

The Definitive Technology Descend DN8 Subwoofer comes with an Extended Warranty. For specific details regarding your warranty coverage, please refer to the Registration Card included in your product packaging or visit the official Definitive Technology website. For technical support or service inquiries, please contact Definitive Technology customer service.