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I

NTRODUCTION

Congratulations on your purchase of a DB Drive state-of-the-art subwoofer compo-

nent. Your selection of a DB Drive car audio product indicates a true appreciation of 

fine musical reproduction.  Whether adding to an existing system or including a DB 

Drive subwoofer in a new system, you are certain to notice immediate performance 

benefits. 

P

RODUCT SPECIFICATIONS

K

EEP 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.

R

ECOMMENDATION

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 wood-

working as well as the proper tools are required.  We highly recommend that you 

have your enclosure built by an authorized DB Drive retailer.  However, if you decide 

to install it yourself, we have included the parameters of each driver and recom-

mended enclosure sizes. If after reviewing the enclosed information you have any 

addition questions, please feel free to contact our technical dept.  

C

ALCULATING 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.

(FS)

(Qts.)

(Qms)

(VAS)

(Xmax)

(Re)

(Pe)

(QES)

(Sens)

27.80Hz 

0.37            

3.45            

42.77L            

0.78inV

6.44Ω            

900/1800  

0.42          

85.30dB

K7 12D4

25.74Hz 

0.45         

4.06           

104.34L            

0.78in

6.43Ω            

900/1800

0.51         

87.33dB

K7 15D4

30.57Hz

0.36 

3.47            

19.63L            

0.78in

6.43Ω            

900/1800    

0.40

83.30dB

K7 10D4

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