Nakamichi NBF618S-II Under Seat Active Subwoofer Enclosure User Manual

Introduction

This manual provides comprehensive instructions for the installation, operation, and maintenance of your Nakamichi NBF618S-II Under Seat Active Subwoofer Enclosure. Please read this manual thoroughly before using the product to ensure proper function and to prevent damage.

Safety Information

Always observe the following safety precautions:

• Do not disassemble or modify the unit. This may cause electric shock or product malfunction.
• Ensure proper wiring and connections to prevent short circuits and electrical hazards.
• Install the unit in a location that does not obstruct driving or interfere with vehicle safety systems.
• Avoid exposing the unit to excessive moisture, dust, or extreme temperatures.
• Disconnect the vehicle's battery before performing any wiring or installation.

Package Contents

Verify that all items are present in the package:

• Nakamichi NBF618S-II Under Seat Active Subwoofer Enclosure
• Remote Control
• Wiring Harness
• Mounting Hardware
• User Manual (this document)

Note: The primary included component listed is "Under Seat Active Subwoofer Enclosure". Other items like remote control, wiring, and mounting hardware are typically included with such products for installation and operation.

Features

The Nakamichi NBF618S-II offers the following key features:

• Compact Design: At just 72mm in height, the NBF618S-II is designed to fit conveniently beneath most vehicle seats, including those with electrical components.
• High Power Output: Delivers 100W RMS power with a peak power of 650W, driving a 6x8 inch woofer for enhanced bass.
• Versatile Input Compatibility: Supports both high-level and low-level inputs, making it compatible with both factory-installed and aftermarket head units.
• Adjustable Bass Boost: Features a bass boost function (0 to -12dB) for customized low-frequency response.
• Integrated Low Pass Filter: Includes a variable low pass filter (50Hz-180Hz) to optimize sound output.

Specifications

Setup and Installation

Proper installation is crucial for optimal performance and safety. It is recommended that installation be performed by a qualified professional.

1. Choosing a Mounting Location

The NBF618S-II is designed for under-seat installation. Ensure the chosen location:

• Provides adequate clearance for the unit and its wiring.
• Does not obstruct any vehicle controls or safety mechanisms.
• Allows for proper ventilation around the unit.

Image Description: A three-quarter view of the Nakamichi NBF618S-II active subwoofer, showing its compact rectangular shape. Dimensions are overlaid on the image: 11.42 inches (depth), 8.27 inches (width), and 2.87 inches (height), illustrating its suitability for under-seat placement.

2. Wiring Connections

Before making any connections, disconnect the negative terminal of the vehicle's battery.

1. Power Connection: Connect the power wire directly to the positive terminal of the vehicle's battery. Use an appropriate gauge wire and an inline fuse (20A recommended) as close to the battery as possible.
2. Ground Connection: Connect the ground wire to a clean, unpainted metal surface of the vehicle chassis. Ensure a solid, low-resistance connection.
3. Remote Turn-On Connection: Connect the remote turn-on wire to the remote output of your head unit. This wire signals the subwoofer to turn on and off with your car's audio system.
4. Audio Input Connection:
   • Low-Level Input (RCA): If your head unit has RCA pre-outs, connect them to the RCA inputs on the subwoofer.
   • High-Level Input: If your head unit does not have RCA pre-outs, use the high-level input (speaker level) connections. Connect the speaker wires from your head unit to the corresponding inputs on the subwoofer's wiring harness.

Image Description: A top-down, slightly angled view of the Nakamichi NBF618S-II active subwoofer. The top surface features a protective metal grille, and the side panel shows various input/output connections and control knobs, including RCA inputs, power terminals, and adjustment dials.

3. Mounting the Subwoofer

Secure the subwoofer firmly to the vehicle floor using the provided mounting hardware. Ensure it is stable and will not shift during vehicle operation.

Operating the Subwoofer

Once installed, adjust the subwoofer settings for optimal audio performance.

• Gain Control: Adjust the gain control to match the output level of your head unit. Start with the gain at minimum and slowly increase it until the bass blends well with the rest of your audio system without distortion.
• Low Pass Filter (LPF): Set the LPF to filter out frequencies above the desired subwoofer range. A common starting point is between 80Hz and 100Hz. Adjust to blend seamlessly with your main speakers.
• Bass Boost: Use the bass boost control to enhance low frequencies. Use sparingly to avoid distortion and speaker damage.
• Phase Switch: If available, adjust the phase switch (0° or 180°) to ensure the subwoofer's output is in phase with your main speakers, providing a more cohesive sound.
• Remote Level Control: Use the wired remote control (if included) to conveniently adjust the subwoofer's output level from the driver's seat.

Maintenance

Regular maintenance helps prolong the life and performance of your subwoofer.

• Cleaning: Use a soft, dry cloth to wipe the exterior of the unit. Do not use abrasive cleaners or solvents.
• Ventilation: Ensure the ventilation grilles are free from dust and debris to prevent overheating.
• Connections: Periodically check all wiring connections to ensure they are secure and free from corrosion.

Troubleshooting

If you experience issues with your Nakamichi NBF618S-II, refer to the following common problems and solutions:

If the problem persists after attempting these solutions, contact Nakamichi customer support or a qualified car audio technician.

Warranty and Support

Nakamichi products are designed and manufactured to the highest quality standards. For information regarding warranty coverage, technical support, or service, please refer to the warranty card included with your product or visit the official Nakamichi website. Keep your purchase receipt as proof of purchase for warranty claims.

For further assistance, you may contact Nakamichi customer service through their official channels.