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2013 BMW X3

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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 2013 BMW X3

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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Product Type
Subwoofer enclosures,
Subwoofers (1,127)
Amplifiers (924)
Subwoofers with a box (775)
Amplifiers with a wiring kit (437)
RCA cables and accessories (262)
Subwoofer enclosures (211)
Subwoofers with an amplifier and box (191)
Lighting accessories (176)
Subwoofer grilles (170)
Tweeters (Pro and special-fit) (151)
Amplifier wiring kits (140)
Speaker clamps and brackets (138)
Power and ground wire (130)
Batteries (128)
Fuses (123)
Backup cameras (119)
Speaker grilles (118)
Sound damping (105)
Subwoofers with an amplifier (101)
Alarm remote transmitters (97)
Handlebar and bar-mount speakers (97)
Line-out converters (90)
Fuse holders (81)
Speaker wire (73)
Ring terminals (63)
Replacement antennas (62)
Distribution blocks (58)
Light bars (58)
Connectors (56)
Speaker enclosures (52)
Tweeters (51)
Bluetooth adapters and transmitters (50)
Speaker spacers and rings (50)
Bass remotes (49)
Cables and interconnects (49)
Sound processors (39)
Dash cameras (38)
Trim rings and universal mounts (38)
Alarms (34)
Stereo remote controls (33)
Recone kits (31)
Rocker and Button switches (31)
Circuit breakers (30)
Primary/Remote wire (29)
Battery isolators and relays (28)
Battery terminals (26)
Exterior lighting (26)
Audio test equipment (25)
Installation accessories (25)
Trigger output and bypass modules (24)
Alarm accessories (23)
Antenna extension cables (23)
Speaker baffles (22)
Split loom and heat shrink (22)
Diodes and resistors (20)
Capacitors (19)
Knockout panels (18)
Equalizers (15)
Noise filters (15)
Terminal cups (14)
Battery terminal posts (13)
Rearview monitor and mirrors (13)
Adapters (12)
Headlight bulbs (11)
Radar and laser detectors (11)
Video adapters and switchers (11)
Speaker diaphragms (10)
Bass booster enhancers and processors (8)
Battery chargers (8)
Power inverters (8)
2-way and CB radios (7)
Amplifier mounting hardware (7)
Panel and clip removal tools (7)
Voltmeters (7)
Blindspot cameras and sensors (6)
Carpet (6)
Gauge adapters (6)
Grommets and firewall bushings (6)
Headlights (6)
Passive crossovers (6)
Sensors (6)
Box ports (5)
Knockout panel mount hardware (5)
Line drivers (5)
Power supplies (5)
Steering wheel adapters (5)
Active Crossovers (4)
Bass Blockers (4)
Big 3 upgrade kits (4)
License plates and frames (4)
Parking sensors (4)
Amplifier cooling fans (3)
Door panel clips (3)
In-motion video/navigation bypass (3)
Subwoofer (3)
Door actuators and poppers (2)
Radar detector mounts (2)
Rearview mirror mounts (2)
Video amplifiers (2)
Alarms with remote start (1)
Backup batteries (1)
Cable management (1)
Connector sets (1)
FM modulators and transmitters (1)
Multi-camera and DVR systems (1)
Overhead monitors (1)
Remote mount media players (1)
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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Condition
Availability
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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
Add to Cart

• 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

Belva BBX112BL (BLUE)

1.842 cu ft. Single 12" Ported Car Subwoofer Box Enclosure with Custom Blue Baffle

BBX112BL big DISCONTINUED
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Belva BBX112BL (BLUE)

1.842 cu ft. Single 12" Ported Car Subwoofer Box Enclosure with Custom Blue Baffle

• 12" Single Ported Subwoofer Enclosure
• 3/4" Medium Density Fiberboard Construction
• Blue Finish Panel
• Durable Black Carpet
• Pre-Lined with Poly-Fil
• Gold Speaker Terminals
• Total box volume: 1.842 Cubic Feet

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22

• 12" Single Ported Subwoofer Enclosure
• 3/4" Medium Density Fiberboard Construction
• Blue Finish Panel
• Durable Black Carpet
• Pre-Lined with Poly-Fil
• Gold Speaker Terminals
• Total box volume: 1.842 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 10AME

Empty Single 10" Shallow Sealed Subwoofer Enclosure

10AME big Out of stock
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Atrend 10AME

Empty Single 10" Shallow Sealed Subwoofer Enclosure

• 10" Single Shallow Sealed Subwoofer Enclosure
• 3/4" Medium Density Fiberboard (MDF) construction
• Shallow construction and downward firing design
• Miter and Dado construction
• Premium carpet finish
• Silver spring loaded terminal cups
• Glued and braced with fasteners
• Total box volume: 0.47 cubic feet

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List price $79.99
-12% $70.20
Add to Cart

• 10" Single Shallow Sealed Subwoofer Enclosure
• 3/4" Medium Density Fiberboard (MDF) construction
• Shallow construction and downward firing design
• Miter and Dado construction
• Premium carpet finish
• Silver spring loaded terminal cups
• Glued and braced with fasteners
• Total box volume: 0.47 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 10SME

Empty Single 10" Sealed Shallow Subwoofer Enclosure

10SME big Out of stock
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Atrend 10SME

Empty Single 10" Sealed Shallow Subwoofer Enclosure

• 10" Single Sealed Shallow Subwoofer Enclosure
• 3/4" Medium Density Fiberboard (MDF) construction
• Completely miter and dado end panels
• Premium carpeted finish
• Total box volume: 0.51 cubic feet

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6
$69.95
Add to Cart

• 10" Single Sealed Shallow Subwoofer Enclosure
• 3/4" Medium Density Fiberboard (MDF) construction
• Completely miter and dado end panels
• Premium carpeted finish
• Total box volume: 0.51 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 8TK

Empty Single 8" Truck Sealed Subwoofer Enclosure

8TK big Out of stock
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Atrend 8TK

Empty Single 8" Truck Sealed Subwoofer Enclosure

• 8" Single Truck Sealed 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: 0.27 cubic feet

Universal Icon Universal – fits most vehicles.

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3
List price $79.99
-13% $69.99
Notify Me

• 8" Single Truck Sealed 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: 0.27 cubic feet

Atrend E10TKV

Empty Single 10" Truck Vented Subwoofer Enclosure

E10TKV big Out of stock
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Atrend E10TKV

Empty Single 10" Truck Vented Subwoofer Enclosure

• 10" Single Truck 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: 0.52 cubic feet

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List price $84.99
-11% $75.40
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• 10" Single Truck 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: 0.52 cubic feet

Atrend E12TKV

Empty Single 12" Universal Truck Style Ported Subwoofer Enclosure

E12TKV big Out of stock
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Atrend E12TKV

Empty Single 12" Universal Truck Style Ported Subwoofer Enclosure

• 12" Universal Truck Style Single Ported Subwoofer Enclosure
• 3/4" Medium Density Fiberboard (MDF) construction
• Total box volume: 0.70 cubic feet
• Premium carpeted finish
• Made in the USA

Universal Icon Universal – fits most vehicles.

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List price $79.99
-6% $75.40
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• 12" Universal Truck Style Single Ported Subwoofer Enclosure
• 3/4" Medium Density Fiberboard (MDF) construction
• Total box volume: 0.70 cubic feet
• Premium carpeted finish
• Made in the USA

Atrend 12TK

Empty Single 12" Truck Sealed Subwoofer Enclosure

12TK big Out of stock
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Atrend 12TK

Empty Single 12" Truck Sealed Subwoofer Enclosure

• 12" Single Truck Sealed 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: 0.27 cubic feet

Universal Icon Universal – fits most vehicles.

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5
List price $99.99
-40% $59.95
Add to Cart

• 12" Single Truck Sealed 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: 0.27 cubic feet

Atrend 10SAL

Empty Single 10" Medium Sealed Subwoofer Enclosure

10SAL big Out of stock
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Atrend 10SAL

Empty Single 10" Medium Sealed Subwoofer Enclosure

• 10" Single Medium Sealed 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: 1 cubic feet

Universal Icon Universal – fits most vehicles.

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7
List price $79.99
-13% $69.99
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• 10" Single Medium Sealed 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: 1 cubic feet

Atrend 10SMV

Empty Single 10" Shallow Vented Subwoofer Enclosure

10SMV big Out of stock
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Atrend 10SMV

Empty Single 10" Shallow Vented Subwoofer Enclosure

• 10" Single Shallow Ported Subwoofer Enclosure
• 1" 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: 0.42 cubic feet

Universal Icon Universal – fits most vehicles.

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List price $79.99
-12% $70.20
Notify Me

• 10" Single Shallow Ported Subwoofer Enclosure
• 1" 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: 0.42 cubic feet

Atrend 15SQKV

Empty Single 15" Vented Enclosure for Kicker L7R and L7S Series Subwoofers

15SQKV big Out of stock
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Atrend 15SQKV

Empty Single 15" Vented Enclosure for Kicker L7R and L7S Series Subwoofers

• 15" Single Ported Subwoofer Enclosure
• Fits Kicker L7R and L7S 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: 3 cubic feet

Universal Icon Universal – fits most vehicles.

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3
List price $119.99
-8% $109.99
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• 15" Single Ported Subwoofer Enclosure
• Fits Kicker L7R and L7S 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: 3 cubic feet

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 E8ST

Empty Single 8" Truck Sealed Subwoofer Enclosure

E8ST big Out of stock
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Atrend E8ST

Empty Single 8" Truck Sealed Subwoofer Enclosure

• 8" Single Truck Sealed Subwoofer Enclosure
• 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: 0.4 cubic feet

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$59.80
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• 8" Single Truck Sealed Subwoofer Enclosure
• 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: 0.4 cubic feet

Dual 10" 3/4 MDF Sealed Subwoofer Enclosure (Belva MDFD10)

Dual 10-inch Sealed Car Sub Box Made with 3/4" MDF and lined w/ Polyfil (1.6 cu ft Airspace - 10SQB)

MDFD10 big Out of stock
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Dual 10" 3/4 MDF Sealed Subwoofer Enclosure (Belva MDFD10)

Dual 10-inch Sealed Car Sub Box Made with 3/4" MDF and lined w/ Polyfil (1.6 cu ft Airspace - 10SQB)

• 3/4" Medium Density Fiberboard Construction
• Durable Black Carpeting
• Pre-Lined with Poly-Fil
• Gold Speaker Terminals

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45
List price $109.99
-18% $89.99
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• 3/4" Medium Density Fiberboard Construction
• Durable Black Carpeting
• Pre-Lined with Poly-Fil
• Gold Speaker Terminals

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

Atrend WDX18SV

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

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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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• 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

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

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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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