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2003 Ford Focus

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Universal gear includes car amplifiers, subs, and other products that do not install in a specific location or require fitment to integrate with a vehicle.

Overview Upgrade your Stereo Upgrade your Speakers Add a Subwoofer Add an Amplifier Digital Sound Processors Audio Installation & Accessories Add a Backup Camera Dads & Grads Sale

Universal-Fit Audio for 2003 Ford Focus

When thinking of universal gear, we consider products like a car amp that gives more power to your speakers or subs, cell phone chargers, equalizers and sound processors, rear-seat entertainment and video monitors, as well as dash cameras.

Better sound with your factory radio

Better sound with a factory radio

Love your factory look or can't replace the stereo? We got you covered.

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Subwoofer enclosures ✕
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Subwoofer enclosures,
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Price Range
Number of Subwoofers
This value represents the number of subwoofers that the enclosure accommodates or that are included in the package or bundled kit.
Box Type
Represents the style of the enclosure. Be sure to purchase the appropriate enclosure type and internal volume that will be compatible with your subwoofer's recommendation.

Sealed - Sealed boxes are those that have no holes or vents in it. The only hole in a sealed box is where the subwoofer is installed. Smaller sealed boxes require more power than a larger sealed box. They provide a tight, accurate bass, while the larger sealed enclosures provide a "boomier" and louder bass.

Ported / Vented - Ported/Vented Enclosures provide an even boomier, louder bass, but less accurate then a small, sealed box. Ported enclosures typically require more airspace per sub and also less power output from an amplifier to perform correctly.

Bandpass - Bandpass enclosures make subwoofers perform efficiently, but loose. The bass is not as "boomy" as a ported enclosure nor as punchy as a sealed enclosure. Bandpass enclosures work well with lower to mid-level subwoofers.
Subwoofer Size
Refers to the diameter of the subwoofer, measured in inches.
Subwoofer Cutout Shape
This is the shape of the enclosures cutout hole and defines the style of subwoofer that can be installed.
Box Exterior Color
The color of the enclosure's exterior/outer finish.
Total Box Volume
The internal volume measurement in cubic feet before subwoofer magnet displacement.
Cutout Diameter or Length
The actual diameter of the hole in the subwoofer box. Length is the measured length per side of a square subwoofer or speaker opening.
Maximum Speaker Depth
Your subwoofer or speaker must not exceed this dimension in order to properly mount in this enclosure.
Box Style/Shape
The box style or shape refers to the actual shape of the box. Square and rectangular boxes are straight-edged boxes on all sides, whereas hatchback and truck style enclosures feature an angled front or back design that allows for installation in places short on depth such as single cab pickup trucks. You can also use such enclosures in hatchback cars or other vehicles where space is a premium. Tube and cylinder shaped boxes were made popular by Bazooka and are a great option for those looking for a nice amount of bass without sacrificing lots of space. They may even fit in locations that slim truck boxes cannot fit in. If the enclosure is vehicle specific, we encourage you to read the product description to find out which vehicles the enclosure is made for.
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Atrend WDX18SV

Empty Single 18" Vented Enclosure for DB Drive WDX WDXG2 G4 and Euphoria FX Series Subwoofers

WDX18SV big
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Atrend WDX18SV

Empty Single 18" Vented Enclosure for DB Drive WDX WDXG2 G4 and Euphoria FX Series Subwoofers

• 18" Single Ported Subwoofer Enclosure
• Fits DB Drive WDX, WDXG2, G4, and Euphoria FX series subwoofers
• 1" Medium Density Fiberboard (MDF) construction
• Miter and Dado construction
• Premium carpet finish
• Silver spring loaded terminal cups
• Glued and braced with fasteners
• Total box volume: 6 cubic feet

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$269.99

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Atrend 12RPS

Empty Single 12" Vented Enclosure for Rockford Fosgate P2 and P3 Series Subwoofers

12RPS big
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Atrend 12RPS

Empty Single 12" Vented Enclosure for Rockford Fosgate P2 and P3 Series Subwoofers

• 12" Single Ported Subwoofer Enclosure
• Fits Rockford Fosgate P2 and P3 series subwoofers
• 3/4" Medium Density Fiberboard (MDF) construction
• Miter and Dado construction
• Premium carpet finish
• Silver spring loaded terminal cups
• Glued and braced with fasteners
• Total box volume: 1.6 cubic feet

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2
List price $119.99
-17% $99.99

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Atrend 10DQV

Empty Dual 10" Vented Subwoofer Enclosure

10DQV big
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Atrend 10DQV

Empty Dual 10" Vented Subwoofer Enclosure

• 10" Dual Ported Subwoofer Enclosure
• 3/4" Medium Density Fiberboard (MDF) construction
• Miter and Dado construction
• Premium carpet finish
• Silver spring loaded terminal cups
• Glued and braced with fasteners
• Total box volume: 2.5 cubic feet

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6
List price $154.99
-35% $99.99

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Atrend 10RPD

Empty Dual 10" Vented Enclosure for Rockford Fosgate P2 and P3 Series Subwoofers

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Atrend 10RPD

Empty Dual 10" Vented Enclosure for Rockford Fosgate P2 and P3 Series Subwoofers

• 10" Dual Ported Subwoofer Enclosure
• Fits Rockford Fosgate P2 and P3 series subwoofers
• 3/4" Medium Density Fiberboard (MDF) construction
• Miter and Dado construction
• Premium carpet finish
• Silver spring loaded terminal cups
• Glued and braced with fasteners
• Total box volume: 2.8 cubic feet

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1
List price $169.99
-35% $109.99

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Single 12" Subwoofer Angled Truck or Hatchback Box Enclosure (Open Box, Great)

1TRUCK12 - CARB Compliant, 5/8" MDF Shallow Sub Enclosure Lined with Polyfil

1TRUCK12 big
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Single 12" Subwoofer Angled Truck or Hatchback Box Enclosure (Open Box, Great)

1TRUCK12 - CARB Compliant, 5/8" MDF Shallow Sub Enclosure Lined with Polyfil

• 5/8" MDF (Medium Density Fiberboard)
• Perfect for Tight Spaces (trucks/hatchbacks)
• Fits Most 12" Subwoofers
• 0.75 CuFt
• fully carpeted
• Fully Caulked and Sealed Tight

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List price $95.99
-42% $55.99

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• 5/8" MDF (Medium Density Fiberboard)
• Perfect for Tight Spaces (trucks/hatchbacks)
• Fits Most 12" Subwoofers
• 0.75 CuFt
• fully carpeted
• Fully Caulked and Sealed Tight

Atrend 12SVN

Empty Single 12" Vented Enclosure for Alpine E-S-R-X Series Subwoofers

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Atrend 12SVN

Empty Single 12" Vented Enclosure for Alpine E-S-R-X Series Subwoofers

• 12" Single Ported Subwoofer Enclosure
• Fits Alpine E, S, R, and X series subwoofers
• 3/4" Medium Density Fiberboard (MDF) construction
• Miter and Dado construction
• Premium carpet finish
• Silver spring loaded terminal cups
• Glued and braced with fasteners
• Total box volume: 1.4 cubic feet

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List price $124.99
-12% $109.99

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Atrend A122-12V

Empty Dual 12" 3rd Row SUV Universal Vented Subwoofer Enclosure

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Atrend A122-12V

Empty Dual 12" 3rd Row SUV Universal Vented Subwoofer Enclosure

• 12" Dual Ported Subwoofer Enclosure
• 3/4" Medium Density Fiberboard (MDF) construction
• Universal fit for 3rd row SUV and behind rear seat
• Subwoofers fire down and vents fire upward
• Miter and Dado construction
• Premium tuff-coat spray liner finish
• Silver spring loaded terminal cups
• Glued and braced with fasteners
• Total box volume: 2.7 cubic feet

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List price $319.99
-11% $283.40

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(2)Single 12" Sealed Car Audio Subwoofer Sub Box Enclosures Pair

1TRUCK12 - CARB Compliant, 5/8" MDF Shallow Sub Enclosure Lined with Polyfil Package

1TRUCK12 2 Pack big
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(2)Single 12" Sealed Car Audio Subwoofer Sub Box Enclosures Pair

1TRUCK12 - CARB Compliant, 5/8" MDF Shallow Sub Enclosure Lined with Polyfil Package

• 5/8" MDF (Medium Density Fiberboard)
• Perfect for Tight Spaces (trucks/hatchbacks)
• Fits Most 12" Subwoofers
• 0.75 CuFt
• fully carpeted
• Fully Caulked and Sealed Tight

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Universal Icon Universal – fits most vehicles.

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29
List price $191.98
-53% $90.90

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NVX NE101S

Single 10" Sealed 3/4" MDF Black Carpeted Subwoofer Enclosure – 0.65 Cu. Ft. with Polyfil and NVX Logo

NE101S big Out of stock
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NVX NE101S

Single 10" Sealed 3/4" MDF Black Carpeted Subwoofer Enclosure – 0.65 Cu. Ft. with Polyfil and NVX Logo

• 10" Single Sealed Subwoofer Enclosure
• 3/4" Medium Density Fiberboard (MDF) construction
• Internal box volume: .65 cubic feet
• Premium Black Carpet with Black NVX Logo

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1
List price $83.99
-17% $69.99
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• 10" Single Sealed Subwoofer Enclosure
• 3/4" Medium Density Fiberboard (MDF) construction
• Internal box volume: .65 cubic feet
• Premium Black Carpet with Black NVX Logo

Atrend 12SMV

Empty Single 12" Shallow Vented Subwoofer Enclosure

12SMV big Out of stock
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Atrend 12SMV

Empty Single 12" Shallow Vented Subwoofer Enclosure

• 12" Single Shallow Ported Subwoofer Enclosure
• 3/4" Medium Density Fiberboard (MDF) construction
• Recessed side-panel design
• Miter and Dado construction
• Premium carpet finish
• Silver spring loaded terminal cups
• Glued and braced with fasteners
• Total box volume: 0.59 cubic feet

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2
List price $89.99
-16% $75.40
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• 12" Single Shallow Ported Subwoofer Enclosure
• 3/4" Medium Density Fiberboard (MDF) construction
• Recessed side-panel design
• Miter and Dado construction
• Premium carpet finish
• Silver spring loaded terminal cups
• Glued and braced with fasteners
• Total box volume: 0.59 cubic feet

Atrend 12DVR - Black Carbon Fiber

Empty Dual 12" Vented Subwoofer Enclosure (Black)

12DVR - BLACK carbon fiber big Out of stock
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Atrend 12DVR - Black Carbon Fiber

Empty Dual 12" Vented Subwoofer Enclosure (Black)

• 12" Dual Ported Subwoofer Enclosure
• 3/4" Medium Density Fiberboard (MDF) construction
• Premium plush black carpet finish
• Carbon fiber pattern
• Signature miter and dado construction
• Bonded using proprietary trick glue
• Total box volume: 3.6 cubic feet

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11
List price $309.99
-40% $184.99
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• 12" Dual Ported Subwoofer Enclosure
• 3/4" Medium Density Fiberboard (MDF) construction
• Premium plush black carpet finish
• Carbon fiber pattern
• Signature miter and dado construction
• Bonded using proprietary trick glue
• Total box volume: 3.6 cubic feet

Atrend 12JLS

Empty Single 12" Sealed Enclosure for JL Audio WX-W0-W1-W3 Series Subwoofers

12JLS big Out of stock
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Atrend 12JLS

Empty Single 12" Sealed Enclosure for JL Audio WX-W0-W1-W3 Series Subwoofers

• 12" Single Sealed Subwoofer Enclosure
• Fits JL Audio WX-W0-W1-W3 series subwoofers
• 3/4" Medium Density Fiberboard (MDF) construction
• Miter and Dado construction
• Premium charcoal carpet finish
• Silver spring loaded terminal cups
• Glued and braced with fasteners
• Total box volume: 1.05 cubic feet

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1
List price $119.99
-13% $104.00
Add to Cart

• 12" Single Sealed Subwoofer Enclosure
• Fits JL Audio WX-W0-W1-W3 series subwoofers
• 3/4" Medium Density Fiberboard (MDF) construction
• Miter and Dado construction
• Premium charcoal carpet finish
• Silver spring loaded terminal cups
• Glued and braced with fasteners
• Total box volume: 1.05 cubic feet

Atrend 10TKV

Empty Single 10" Truck Vented Subwoofer Enclosure

10TKV big Out of stock
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Atrend 10TKV

Empty Single 10" Truck Vented Subwoofer Enclosure

• 10" Single Truck Ported Subwoofer Enclosure
• 3/4" Medium Density Fiberboard (MDF) construction
• Universal truck (wedge) enclosure design
• Miter and Dado construction
• Premium carpet finish
• Silver spring loaded terminal cups
• Glued and braced with fasteners
• Total box volume: 0.52 cubic feet

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3
List price $99.99
-10% $89.99
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• 10" Single Truck Ported Subwoofer Enclosure
• 3/4" Medium Density Fiberboard (MDF) construction
• Universal truck (wedge) enclosure design
• Miter and Dado construction
• Premium carpet finish
• Silver spring loaded terminal cups
• Glued and braced with fasteners
• Total box volume: 0.52 cubic feet

Atrend 12TKLV

Empty Single 12" Truck Large Vented Subwoofer Enclosure

12TKLV big Out of stock
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Atrend 12TKLV

Empty Single 12" Truck Large Vented Subwoofer Enclosure

• 12" Single Truck Large Ported Subwoofer Enclosure
• 3/4" Medium Density Fiberboard (MDF) construction
• Universal truck (wedge) enclosure design
• Miter and Dado construction
• Premium carpet finish
• Silver spring loaded terminal cups
• Glued and braced with fasteners
• Total box volume: 0.51 cubic feet

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7
List price $179.99
-28% $129.99
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• 12" Single Truck Large Ported Subwoofer Enclosure
• 3/4" Medium Density Fiberboard (MDF) construction
• Universal truck (wedge) enclosure design
• Miter and Dado construction
• Premium carpet finish
• Silver spring loaded terminal cups
• Glued and braced with fasteners
• Total box volume: 0.51 cubic feet

Atrend 10TKT

Empty Triple 10" Sealed Truck Subwoofer Enclosure

10TKT big Out of stock
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Atrend 10TKT

Empty Triple 10" Sealed Truck Subwoofer Enclosure

• 10" Triple Sealed Truck Subwoofer Enclosure
• 3/4" Medium Density Fiberboard (MDF) construction
• Miter and Dado construction
• Premium black carpet finish
• Silver spring loaded terminal cups
• Glued and braced with fasteners
• Total box volume: 1.86 cubic feet

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• 10" Triple Sealed Truck Subwoofer Enclosure
• 3/4" Medium Density Fiberboard (MDF) construction
• Miter and Dado construction
• Premium black carpet finish
• Silver spring loaded terminal cups
• Glued and braced with fasteners
• Total box volume: 1.86 cubic feet

Atrend 12W7SV

Empty Single 12" Vented Enclosure for JL Audio W7/W7AE Series Subwoofers

12W7SV big Out of stock
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Atrend 12W7SV

Empty Single 12" Vented Enclosure for JL Audio W7/W7AE Series Subwoofers

• 12" Single Ported Subwoofer Enclosure
• Fits JL Audio W7/W7AE series subwoofers
• 1" Medium Density Fiberboard (MDF) construction
• Miter and Dado construction
• Premium carpet finish
• Silver spring loaded terminal cups
• Glued and braced with fasteners
• Total box volume: 2.3 cubic feet

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7
List price $234.99
-23% $179.99
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• 12" Single Ported Subwoofer Enclosure
• Fits JL Audio W7/W7AE series subwoofers
• 1" Medium Density Fiberboard (MDF) construction
• Miter and Dado construction
• Premium carpet finish
• Silver spring loaded terminal cups
• Glued and braced with fasteners
• Total box volume: 2.3 cubic feet

Atrend SPL-12SV

Empty Single 12" SPL Vented Subwoofer Enclosure

SPL-12SV big Out of stock
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Atrend SPL-12SV

Empty Single 12" SPL Vented Subwoofer Enclosure

• 12" Single Ported Subwoofer Enclosure
• 3/4" Medium Density Fiberboard (MDF) construction
• Miter and dado enclosure construction
• Specially formulated proprietary trick glue
• Coated tough coat spray liner guard finish
• Total box volume: 2.69 cubic feet

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7
List price $369.99
-51% $179.99
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• 12" Single Ported Subwoofer Enclosure
• 3/4" Medium Density Fiberboard (MDF) construction
• Miter and dado enclosure construction
• Specially formulated proprietary trick glue
• Coated tough coat spray liner guard finish
• Total box volume: 2.69 cubic feet

Belva Sub Box 1SV12G (Gray)

Single 12" Vented MDF Enclosure

1SV12G big Out of stock
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Belva Sub Box 1SV12G (Gray)

Single 12" Vented MDF Enclosure

• Single 12" Vented MDF Enclosure
• Holds one 12" subwoofer
• 3/4 MDF (Medium Density Fiberboard) Construction
• Durable gray carpeting
• Gold Terminals
• Internal Box Volume: 1.8 cubic ft.

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98
List price $109.99
-45% $59.99
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• Single 12" Vented MDF Enclosure
• Holds one 12" subwoofer
• 3/4 MDF (Medium Density Fiberboard) Construction
• Durable gray carpeting
• Gold Terminals
• Internal Box Volume: 1.8 cubic ft.

Atrend 12DSRF

Empty Dual 12" Small Sealed Enclosure for Rockford Fosgate Prime R2 Series Subwoofer

12DSRF big Out of stock
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Atrend 12DSRF

Empty Dual 12" Small Sealed Enclosure for Rockford Fosgate Prime R2 Series Subwoofer

• 12" Dual Small Sealed Subwoofer Enclosure
• Fits Rockford Fosgate Prime R2 series subwoofers
• 3/4" Medium Density Fiberboard (MDF) construction
• Miter and Dado construction
• Premium black carpet finish
• Silver spring loaded terminal cups
• Glued and braced with fasteners
• Total box volume: 3 cubic feet

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List price $219.99
-18% $179.40
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• 12" Dual Small Sealed Subwoofer Enclosure
• Fits Rockford Fosgate Prime R2 series subwoofers
• 3/4" Medium Density Fiberboard (MDF) construction
• Miter and Dado construction
• Premium black carpet finish
• Silver spring loaded terminal cups
• Glued and braced with fasteners
• Total box volume: 3 cubic feet

Atrend 12TKD

Empty Dual 12" Truck Sealed Subwoofer Enclosure

12TKD big Out of stock
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Atrend 12TKD

Empty Dual 12" Truck Sealed Subwoofer Enclosure

• 12" Dual Truck Sealed Subwoofer Enclosure
• 3/4" Medium Density Fiberboard (MDF) construction
• Universal truck (wedge) enclosure design
• Miter and Dado construction
• Premium black carpet finish
• Silver spring loaded terminal cups
• Glued and braced with fasteners
• Total box volume: 1.38 cubic feet

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7
List price $174.99
-20% $139.95
Add to Cart

• 12" Dual Truck Sealed Subwoofer Enclosure
• 3/4" Medium Density Fiberboard (MDF) construction
• Universal truck (wedge) enclosure design
• Miter and Dado construction
• Premium black carpet finish
• Silver spring loaded terminal cups
• Glued and braced with fasteners
• Total box volume: 1.38 cubic feet

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    • Vehicle produced after 2005: Inside driver's side door
    • Vehicle produced before 2005: Rear passenger doorjamb, glove box, center console, or engine compartment
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    Modern vehicles often require specific brackets, wiring harnesses, and mounting solutions. A fit guide ensures:

    • You see only parts engineered for your exact vehicle
    • You avoid incompatible radios, speakers, or wiring
    • Installation is smoother, faster, and frustration-free
    • You get the correct accessories the first time

    Whether you're replacing a factory stereo or upgrading your entire audio system, the Fit Finder eliminates uncertainty.

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