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Sealed enclosures offer a range of performance 

profiles depending on the internal air volume. 

Larger enclosures will have a smoother more 

extended response while a small enclosure 

will have increased output in a more focused 

frequency range. Sealed enclosures are the 

simplest to construct but do require that the box 

be completely air tight.

• 

Use 3/4” MDF

• 

Make sure the woofer mounting panel is 

full width and height

• 

Glue all mating surfaces

• 

Use wood screws

• 

Use silicone caulk on all internal joints

The internal volume of the 

enclosure must be determined 

to insure proper performance. 

Simply measure height, width and 

depth of enclosure you intend 

to build. Subtract the material 

thickness. Multiply these numbers 

and divide by 1728 to get the 

volume in cubic feet.

For enclosures with an angled 

panel, measure the larger and 

smaller depths, add these 

together and divide by two. Use 

this averaged depth.

Enclosure 

Volume

D

H x W x D

1728

D1 + D2

2

 

Sealed

Enclosure types

Volume calculation

Subwoofer dimensions

CAUTION

Always consider consulting a professional audio installer 

before installing new subwoofers. High power audio 

systems have the ability create sound levels above 130dB. 

Extended exposure to high sound pressure levels can 

cause hearing damage.  

Always run any new wiring through safe areas that wont 

interfere with the normal operation of the vehicle.

Congratulations on your choice of a MB Quart subwoofer. 

This “Quick Start Installation” guide is meant to help you 

“hook up” and play music. For more detailed information 

on system setting, speaker and subwoofer configuration, 

and full specifications by model, visit the website at

MBQuart.com

It’s a good idea to confirm that you have purchased the 

correct size subwoofers to fit your vehicle. If you have any 

reservations about being able to complete the installation 

yourself, we recommend contacting a professional. Be careful 

as you go. Always disconnect the negative battery terminal 

before starting any electrical work on the vehicle.

FW1-254 FW1-304

Height

13.5”

13.5”

Width

13.5”

13.5”

Depth

10.5”

13.5”

Vb

0.70 ft

3

0.91 ft

3

F3

52.33

48.23

Qtc

1.006

1.151

Before you start

 

Sealed

Recommended enclosures

Enclosure construction

in(cm)

A

B

C

D

FW1-254

10.09”(25.6) 4.94”(12.54) 9.1”(23.1)

5.6”(14.4)

FW1-304

12.19”(30.9) 5.59”(13.53) 11.00”(28)

6.3”(16)

A

B

D

C

 

Vented

Vented designs are NOT recommended. This 

subwoofer is designed to perform in small 

sealed enclosures.

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