Quantum Audio QW3000/12D4 User manual

Please Note: Our suggested box volumes are given as internal air requirements
TM
Recommended Enclosures
TM
DB Research L.L.P. • 302 Hanmore Industrial Parkway • Harlingen, TX 78550
ph: 877.787.0101 • fx: 956.421.4513 • www.dbdrive.net • tech Support: [email protected]
QW3000/12D4 - QW3000/15D4
Sealed Enclosure
Box Volume 1.40 cu ft.
Ported Enclosure
Box Volume 2.48 cu ft.
Box Tuning 39Hz
Port Diameter 4in
Port Length 6in
QW3000/12D4
Sealed Enclosure
Box Volume 2.33 cu ft.
Ported Enclosure
Box Volume 2.95 cu ft.
Box Tuning 39Hz
Port Diameter 6in
Port Length 13in
QW3000/15D4
USER MANUAL
Installation Instructions | Owners Manual
Due to continuous improvement of the product, specifications are subject to change without notice.
sealed ported
203 mm/ 8 in
346.40 mm / 13.63 in
390 mm / 15.35 in
165 mm / 6.49 in
275 mm / 10.82 in
316 mm / 12.44 in

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.
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 woodworking 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, specifications and design are subject to change without notice.
TM
(Re)
(fo)
(BL)
(Qms)
(Qes)
(Qts.)
(Vas)
(Cms)
(Mms)
(Sens.)
(Xmax)
6.8 Ω
37.36 Hz
19.5 N/A
5.54
0.94
0.81
32.1L
80.195u mm/N
226.28 gr
87.5 dB
0.60in
QW3000/12D4 QW3000/15D4
6.8 Ω
31.15 Hz
21.3 N/A
2.60
0.92
0.68
80.64L
82.520u mm/N
316.22 gr
86.8 dB
0.60in