DB Research QUANTUM AUDIO QW3000-8D4

Need help?

Do you have a question about the DB Research QUANTUM AUDIO QW3000-8D4 and is the answer not in the manual?

Overview

Function Description
Important Technical Specifications
Usage Features
Maintenance Features

The provided document is an installation and owner's manual for the Quantum Audio QW3000-8D4 subwoofer.

Function Description

The Quantum Audio QW3000-8D4 is a high-performance car audio subwoofer component designed to enhance musical reproduction in a vehicle's sound system. It is intended to be integrated into either a new audio setup or added to an existing system to provide deep, impactful bass frequencies. The manual emphasizes that proper installation, enclosure size, and crossover frequency are crucial for maximizing the subwoofer's overall performance. It can be used in both sealed and ported enclosures, with specific recommendations provided for each type to achieve optimal sound.

Important Technical Specifications

The manual lists several key Thiele-Small parameters for the QW3000-8D4, which are essential for designing an appropriate enclosure:

(Re) DC Resistance: 6.4 Ω
(fo) Resonant Frequency: 40.731 Hz
(BL) Motor Strength: 19.316 N/A
(Qms) Mechanical Q: 4.149
(Qes) Electrical Q: 0.585
(Qts.) Total Q: 0.513
(Vas) Equivalent Air Volume: 7.257 L
(Cms) Mechanical Compliance: 114.534 µ M/N
(Mms) Moving Mass: 133.306 gr
(Sens.) Sensitivity: 81.1 dB
(Xmax) Linear Excursion: 15.24 mm

These parameters indicate that the QW3000-8D4 is a subwoofer designed for robust bass reproduction, with a relatively low resonant frequency and a good balance of Q values for versatile enclosure applications. The Xmax value suggests its capability for significant cone movement, contributing to powerful low-frequency output.

Usage Features

The QW3000-8D4 is designed for flexible integration into car audio systems. The manual provides specific recommendations for enclosure types and volumes:

Sealed Enclosure:
- Box Volume: 0.6 cu ft. / 16.99 L
- This type of enclosure typically offers tighter, more accurate bass response, suitable for audiophiles prioritizing sound quality over sheer volume.
Ported Enclosure:
- Box Volume: 0.9 cu ft. / 25.49 L
- Box Tuning: 38Hz
- Port Area: 7.7 sq in. / 45.6 cm²
- Port Length: 14.7 in / 37.44 cm
- A ported enclosure generally provides higher output and deeper bass extension, often preferred for those seeking more impactful and louder bass.

The manual includes detailed instructions on how to calculate both external and internal box volumes, which is crucial for users who choose to build their own enclosures. It recommends using 3/4" thick MDF (medium density fiberboard) and ensuring the enclosure is sealed airtight for optimal performance.

A significant safety warning is included, advising users about the dangers of exposure to high sound pressure levels, which can cause hearing loss or damage. It also cautions against listening to the system at loud levels while driving, as it can impair the ability to hear traffic sounds and emergency vehicles. Furthermore, it stresses the importance of securely fastening the subwoofer enclosure to the vehicle's frame or floorpan to prevent it from becoming a projectile in a collision.

Maintenance Features

While the manual does not explicitly detail "maintenance features" in the traditional sense (like cleaning instructions or part replacement), it strongly emphasizes proper installation and enclosure construction as key to the subwoofer's longevity and performance.

Professional Installation Recommendation: The manual highly recommends having the enclosure built by an authorized Quantum Audio retailer. This suggests that proper construction is vital and can be complex, implying that incorrect construction could lead to suboptimal performance or potential damage.
Enclosure Material: The recommendation to use 3/4" thick MDF and ensure an airtight seal for the enclosure is a preventative measure, ensuring the subwoofer operates within its designed parameters and is protected from external elements that could affect its performance or lifespan.
Warranty Information: The document instructs users to keep their sales receipt as it is necessary to establish the purchase date for warranty service. This implies that the product is covered by a warranty, and proper documentation is essential for any potential repairs or replacements. The enclosed warranty card would contain specific details regarding coverage and procedures.
Technical Support: Users are encouraged to contact the technical department for any additional questions after reviewing the provided information. This indicates ongoing support for troubleshooting and guidance, which can be considered a maintenance-related feature, helping users resolve issues and ensure the subwoofer continues to perform as intended.

In summary, the Quantum Audio QW3000-8D4 is a high-quality subwoofer component designed for car audio enthusiasts. Its performance is heavily reliant on correct enclosure design and installation, for which the manual provides comprehensive guidance and strong safety warnings. While direct maintenance steps are not listed, the emphasis on professional installation, proper enclosure construction, and available technical support all contribute to the long-term care and optimal functioning of the device.