DB Research Hypnotic HW12D4 Service manual

Installation Instructions / Owner’s Manual
Sealed Enclosure
Box Volume 1.15cu ft.
Ported Enclosure
Box Volume 1.42cu ft.
Box Tuning 39Hz
Port Diameter 4in
Port Length 18in
HW12D4
Please Note: Our suggested box volumes are given as internal air requirements.
HW12D4
Recommended Enclosures
PORTEDSEALED
12.40in./315mm
10.82in./275mm
5.51in./140mm
5.73in./145.5mm
5.53in./140.5mm
5.31in./135mm

Congratulations on your purchase of a HYPNOTIC state-of-the-art subwoofer com-
ponent. Your selection of a HYPNOTIC car audio product indicates a true apprecia-
tion of fine musical reproduction. Whether adding to an existing system or including
a HYPNOTIC subwoofer in a new system, you are certain to notice immediate
performance benefits.
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.
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 wood -
working as well as the proper tools are required. We highly recommend that you
have your enclosure built by an authorized HYPNOTIC 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.
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” cubic inches
2.) Next you must convert cubic inches into cubic feet. To do this, you must
divide the cubic inches total by 1728”. Example 1512” ÷ 1728=.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 = 984.375
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.
(FS) 32.810 Hz
(Qts) 0.833
(Qms) 3.926
(VAS) 79.838 L
(Xmax) 12 mm
(Pe) 350/1500
(Re) 3.2Ω x 2
(QES) 1.057
(SPL) 86.1 dB
(Cms) 199.456 mm/N
(BL) 12.134 N/A
(Mms) 117.969 g
INTRODUCTION
KEEP YOUR SALES RECEIPT
RECOMMENDATION
CALCULATING ENCLOSURES
PRODUCT SPECIFICATIONS
HW12D4
WARNING!
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.