DB Research Quantum Audio QWX4000/8D4 Service manual

TM
Please Note: Our suggested box volumes are given as internal air requirements
Recommended Enclosures
Installation Instructions / Owner’s Manual
QWX4000/8D4
QWX4000/10D4
QWX4000/12D4
QWX4000/15D4
Sealed Enclosure
Box Volume: .66 cu ft
Ported Enclosure
Box Volume: 1.16cu ft
Box Tuning: 38 Hz
Port Area: 9.62 sq in
Port Length: 16in
QWX4000/8D4
Sealed Enclosure
Box Volume: 1.34cu ft
Ported Enclosure
Box Volume: 1.57cu ft
Box Tuning: 38 Hz
Port Area: 12.57 sq in
Port Length 15 in
QWX4000/10D4
Sealed Enclosure
Box Volume: 1.50cu ft
Ported Enclosure
Box Volume: 1.85cu ft
Box Tuning: 35Hz
Port Area: 12.57sq in
Port Length 14in
QWX4000/12D4
Sealed Enclosure
Box Volume: 2.82cu ft
Ported Enclosure
Box Volume: 2.96cu ft
Box Tuning: 35Hz
Port Area: 19.63sq in
Port Length 11in
QWX4000/15D4
10.43”/ 265mm
6.74” / 171.4mm
9.25” / 235.10mm
12.48” / 317mm
6.69” / 170mm
6” / 155mm
6.37” / 161mm
11.14” / 283mm
5.76” / 146.33mm
6.37” / 162mm
8.56”/ 217.5mm
5.55” / 141mm
4.88” / 124mm
5.70” / 145mm
7.20” / 183mm
sealed ported
15.55”/ 395mm
7.92” / 201.20mm
7.25” / 184.20mm
6.37” / 162mm
13.85” / 351.68mm

Fs [Hz] 51.30 Hz
Re [Ohm] 3.4 ohm+3.4 ohm
BL 9.87 N/A
Cms 106.587 um/N
Mms 90.280 g
Sd 18.869 mM²
Qes 0.478
Qms 3.122
Qts 0.415
Vas 5.389 L
42.76 Hz
3.4 ohm+3.4 ohm
9.782 N/A
84.22 um/N
164.483 g
31.416 mM²
0.739
4.258
0.630
11.803
45.48 Hz
3.4 ohm+3.4 ohm
15.007 N/A
30.818 um/N
397.289 g
49.087 mM²
0.857
4.596
0.722
10.545
37.904 Hz
3.4 ohm+3.4 ohm
10.631 N/A
68.080 um/N
258.97 g
80.425 mM²
0.873
4.648
0.735
62.530
TM
INTRODUCTION
Congratulations on your purchase of a Quantum Audio state-of-the-art subwoofer
component. Your selection of a Quantum Audio car audio product indicates a true
appreciation of fine musical reproduction. Whether adding to an existing system or
including a Quantum Audio subwoofer in a new system, you are certain to notice
immediate performance benefits.
PRODUCT SPECIFICATIONS
KEEP YOUR SALES RECEIPT
Take this time to attach your sales receipt to the manual and put in a safe place. In
case of any unforeseen reason this product may need warranty service, your receipt
will be necessary to establish purchase date. For detailed warranty information
please refer to enclosed warranty card, or visit QuantumAudio.net.
RECOMMENDATION
WARNING!
A speaker’s performance is only as good as it’s enclosure. Proper installation,
enclosure size and crossover frequency will maximize the overall performance of
the subwoofer. To properly design and build an enclosure, knowledge of woodwork-
ing as well as the proper tools are required. We highly recommend that you have
your enclosure built by an authorized Quantum Audio retailer. However, if you
decide to install it yourself, we have included the parameters of each driver and
recommended enclosure sizes. If after reviewing the enclosed information you have
any addition questions, please feel free to contact our technical dept.
CALCULATING ENCLOSURES
It is difficult to give exact box dimensions that are universal for all cars and trucks.
It is for this reason that you must be able to calculate the space in which you have
available in order to achieve the proper air volume required.
It is recommended to build your enclosure from 3/4” thick MDF (medium density
fiberboard). Make sure the enclosure is sealed airtight.
Calculating External Volume
1.) To calculate box volume, measure the outside Width x Height x Depth of
the enclosure. Example 12” x 14” x 9”=1512 ÷ 1728” Cubic feet
2.) Next you must convert cubic inches into cubic feet. To do this, you must
divide the cubic inches total by 1728”. Example 1512 ÷ 1828=.875 Cubic feet
Calculating Internal Volume
1.) To calculate the internal (net) volume of the above box you must first multiply
the thickness of the wood you are using by Two(2). Example 3/4” x 2= 1.5“
2.) Next subtract 1.5 from each of the outside measurements of the box.
Width Height Depth
12 - 1.5 = 10.5 14 - 1.5 = 12.5 9 - 1.5 = 7.5
3.) Multiple the new totals (H x W x D) Example: 10.5 x 12.5 x 7.5 = .5696
4.) Next you must convert cubic inches into cubic feet. To do this, you must
divide the cubic inch total by 1728”. Example 984.375 ÷ 1728=.5696
cubic feet.
Exposure to high pressure levels can cause hearing loss or
damage. Listening to your system at loud levels while driving, will
impair your ability to hear traffic sounds and emergency vehicles.
Use common sense when listening to your system.
While installing your subwoofer enclosure in the vehicle. Securely
fasten it to the frame or floorpan. If the enclosure is not secured
properly, there is danger of it becoming a projectile in a collision.
Due to continuing product improvement, specications and design are subject to change without notice.
QWX4000/8D4 QWX4000/10D4 QWX4000/12D4 QWX4000/15D4