Enclosure Only, 10 and 12 Inch

Focal Subwoofer Boxes and Enclosures

Sealed and ported enclosures cut for Focal subwoofers, CNC-machined in Tullahoma, Tennessee.

Proline X subwoofer enclosures built for Focal subwoofers.

Enclosure Only, 10 and 12 Inch

The enclosures here are cut for Focal's SUB 25 KXE and SUB 30 KXE subwoofers and for the Flax Evo P 25 FSE, in wedge and down-fire shapes, sealed and ported, single and dual.

Every cabinet is machined in Tullahoma, Tennessee to the parameters Focal publishes for the driver it names. We build the box; you source the driver.

Focal enclosures in 10 and 12 inch, sealed and ported, wedge and down-fire, all on the Performance Optimized standard. Enclosure only.

Cut, assembled and finished in Tullahoma, Tennessee, to the parameters Focal publishes for each driver.

Driver parameters are taken from Focal published data. We build enclosures to those figures; we do not stock Focal drivers and make no claim to represent the brand.

Decision Shortcut

Find Your Match

Curated picks matched to common build goals

Best Value

Proline X PO 10-S W KXE sealed wedge, front baffle with gloss black insert and pre-wired leads, 20.4 by 13 inches.

Proline X

Focal SUB 25 KXE Box: Sealed 10" Wedge Enclosure

The entry point to the Focal range: a sealed wedge for the SUB 25 KXE with polyfill installed.

$ 269.99

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Best High-Output

Proline X PO 12-P W KXE ported wedge, front baffle with gloss black insert and pre-wired leads, 30 by 15.5 inches.

Proline X

Focal SUB 30 KXE Box: Ported 12" Wedge Enclosure

The SUB 30 KXE in a ported wedge tuned to 35 Hz, for more output around tuning.

$ 399.99

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Best Dual

Proline X PO 12D-S W KXE sealed wedge, front baffle with gloss black insert and pre-wired leads, 32 by 16 inches.

Proline X

Focal SUB 30 KXE Dual Box: Sealed 12" Wedge Enclosure

Two SUB 30 KXE in a sealed wedge at 2.50 cubic feet, shaped for a seat back.

$ 389.99

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Best for Flax Evo

A dark gray Proline PO 10-S DF FSE speaker cabinet shown on a dark promotional graphic with dimension labels: 30 inches wide, 6.1 inches tall, and feet adding 1.

Proline X

Focal Flax Evo P 25 FSE Box: Sealed 10" Down Fire Enclosure

The one cabinet cut for the Flax Evo P 25 FSE: a sealed down-fire at 0.80 cubic feet.

$ 259.99

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Every Focal Cabinet We Cut

Net volume and tuning as stated on each listing. All are Performance Optimized.

Focal cabinets currently listed. Net volume in cubic feet.
CabinetDriverNet volumeTuning
Wedge sealed 10SUB 25 KXE0.83Sealed
Wedge sealed dual 10SUB 25 KXE1.66Sealed
Down-fire sealed 10SUB 25 KXE1.18Sealed
Down-fire sealed dual 10SUB 25 KXE1.66Sealed
Down-fire ported 10SUB 25 KXE1.3834 Hz
Wedge sealed 12SUB 30 KXE1.30Sealed
Wedge sealed dual 12SUB 30 KXE2.50Sealed
Down-fire sealed 12SUB 30 KXE1.30Sealed
Wedge ported 12SUB 30 KXE1.5635 Hz
Down-fire ported 12SUB 30 KXE1.4034 Hz
Down-fire sealed 10Flax Evo P 25 FSE0.80Sealed

Shared across every cabinet: Langboard Elite MDF cut on ShopSabre routers in Tullahoma, Tennessee, a 1.5 inch double baffle, and a Proline X ABS and carbon fibre composite terminal cup pre-wired in 12-gauge OFC.

Focal Subwoofer Box Directory by Model

We build sealed and ported enclosures for 3 Focal subwoofer models, 10 to 12 inch, in down-fire and wedge styles from single, dual, triple and quad woofer cabinets. Open a model to see every box cut for it, with net volume, tuning and outside dimensions. Full specs and fitment notes are on each product page.

Focal Flax Evo P 25 FSE 2 boxes
BoxSeriesNet volumeTuningOutside dimensions
Down Fire Sealed, SinglePerformance Optimized0.754 ft³Sealed30" W x 15" D x 6.125" H
Down Fire Wide Sealed, SinglePerformance Optimized0.800 ft³Sealed41" W x 12" D x 6" H
Focal SUB 25 KXE 9 boxes
BoxSeriesNet volumeTuningOutside dimensions
Down Fire Ported, SinglePerformance Optimized1.38 ft³34.0 Hz31" W x 17.00" D x 7.75" H
Down Fire Sealed, SinglePerformance Optimized1.18 ft³Sealed30.00" W x 15.00" D x 8.27" H
Down Fire Wide Sealed, SinglePerformance Optimized1.300 ft³Sealed41" W x 12" D x 8.3125" H
Wedge Sealed, SinglePerformance Optimized0.83 ft³Sealed20.38" W x 13" H x 13.34" D, tapering to 8.61"
Down Fire Sealed, DualPerformance Optimized1.66 ft³Sealed30.00" W x 15.00" D x 11.23" H
Down Fire Wide Sealed, DualPerformance Optimized1.672 ft³ total / 0.836 ft³ per chamberSealed41" W x 12" D x 10.5" H
Wedge Sealed, DualPerformance Optimized1.66 ft³Sealed32.00" W x 15" H x 14.09" D, tapering to 8.63"
Wedge Wide Sealed, TriplePerformance Optimized2.50 ft³Sealed40" W x 17" H x 14.81" D, tapering to 8.62"
Wedge Wide Sealed, QuadPerformance Optimized3.33 ft³Sealed44" W x 17" H x 16.36" D, tapering to 10.17"
Focal SUB 30 KXE 9 boxes
BoxSeriesNet volumeTuningOutside dimensions
Down Fire Ported, SinglePerformance Optimized1.40 ft³34.0 Hz31" W x 17.50" D x 7.75" H
Wedge Ported, SinglePerformance Optimized1.56 ft³35.0 Hz30.00" W x 15.50" H x 15.39" D, tapering to 9.75"
Down Fire Sealed, SinglePerformance Optimized1.30 ft³Sealed30.00" W x 15.00" D x 8.99" H
Down Fire Wide Sealed, SinglePerformance Optimized1.539 ft³Sealed41" W x 14" D x 8.3125" H
Wedge Sealed, SinglePerformance Optimized1.30 ft³Sealed25.85" W x 15" H x 13.67" D, tapering to 8.21"
Down Fire Sealed, DualPerformance Optimized1.70 ft³Sealed30.00" W x 15.00" D x 11.73" H
Down Fire Wide Sealed, DualPerformance Optimized1.717 ft³ total / 0.858 ft³ per chamberSealed41" W x 14" D x 9.5625" H
Wedge Sealed, DualPerformance Optimized2.50 ft³Sealed32.00" W x 16" H x 17.44" D, tapering to 11.62"
Wedge Wide Sealed, TriplePerformance Optimized3.89 ft³Sealed44" W x 17" H x 18.11" D, tapering to 11.92"

Built to Focal's Published Figures

The KXE subwoofers
The SUB 25 KXE and SUB 30 KXE get the widest choice here: sealed wedges and sealed down-fires in single and dual, plus ported cabinets tuned between 34 and 35 Hz.

The Flax Evo P 25 FSE
The ten inch Flax Evo is cut as a sealed down-fire at 0.80 cubic feet, to the figures Focal publishes for that driver.

One construction standard
Every cabinet on this page is Performance Optimized: a 1.5 inch double baffle, cut to one driver rather than to a size class, with a 1-year limited warranty.

How to Choose

Start from the driver
Each cabinet is cut to one Focal model's published parameters, and the listing names it. The SUB 25 KXE and the Flax Evo P 25 FSE are both ten inch drivers that want different cabinets.

Then the alignment
Sealed is the smaller, more forgiving box and ships with polyfill installed. Ported gives more output around its tuning from a larger cabinet and ships without fill. The sealed and ported pages set the two side by side.

Then the shape
Wedge if the box goes against a seat back, down-fire if it sits on a floor.

Then source the driver
We do not stock Focal subwoofers. These cabinets are cut for a driver you already own or buy elsewhere. Other brands are on the subwoofer box hub.

Wedge or Down-Fire

Wedge: against a seat back
The rear panel is tapered to sit flush against a raked seat back or a truck cab wall. That recovers airspace a square box would waste in the same spot. See every brand's wedge cabinets.

Down-fire: on a flat floor
The cone faces the floor, with the gap set by the cabinet's feet rather than left to chance. It suits an SUV or hatch cargo floor where height is short. See every brand's down-fire cabinets.

Cut for One Driver, Not a Size Class

A ten inch Focal cabinet here is not a general ten inch box. Each is cut to the published alignment of the driver it names, so the net volume and the baffle cutout are right for that model rather than approximated for a family of them.

Enclosure Only

We do not stock Focal subwoofers. These cabinets are built to Focal's published figures for a driver you already own or buy elsewhere, and any warranty on the driver itself runs through Focal.

The Focal Range at a Glance

SUB 25 KXE (10 inch): a sealed wedge and a sealed down-fire, each in single and dual, and a ported down-fire tuned to 34 Hz.

SUB 30 KXE (12 inch): a sealed wedge in single and dual, a sealed down-fire, a ported wedge tuned to 35 Hz and a ported down-fire tuned to 34 Hz.

Flax Evo P 25 FSE (10 inch): a sealed down-fire.

Driver-matched

Performance Optimized Series

The whole range

Every Focal cabinet here: a 1.5 inch double baffle, cut to one driver's published alignment rather than a size class.

1-year limited warranty

Two shapes

Wedge and down-fire

10 and 12 inch

Wedges for seat backs and cab walls, down-fires for flat cargo floors, sealed and ported, single and dual.

Sealed and ported

Enclosure only

You source the driver

Box only

We sell no Focal drivers. The cabinet is built to Focal's published figures for a subwoofer you buy elsewhere.

No driver

Each product page states how that cabinet is built and which Focal model it was cut for.

Categories

Keep Reading

Supporting guides to help you design, build, and tune your system.

Focal Subwoofer Box Questions

Which Focal subwoofers do these boxes fit?

The SUB 25 KXE and SUB 30 KXE, and the Flax Evo P 25 FSE. Each product page names the driver its cabinet was cut for. Match the model rather than the size, because the two Focal tens here want different cabinets.

Do you sell Focal subwoofers?

No. We build the enclosure to the figures Focal publishes and you source the driver. Any warranty on the driver itself runs through Focal.

Should I choose sealed or ported for my KXE?

Sealed is the smaller, more forgiving box and holds its output below tuning. Ported gives more output around its tuning, 34 or 35 Hz here, from a larger cabinet. Our EBP calculator is a quick first check on which alignment a driver favours.

Wedge or down-fire?

Wedge if the box goes against a seat back or a truck cab wall; its tapered rear panel recovers airspace there. Down-fire if it sits on a flat cargo floor, with the floor gap set by the cabinet's feet.

Do the sealed boxes come with polyfill?

Yes. Every sealed cabinet ships with polyfill installed. The ported cabinets ship without it, so the tuning on the listing is the tuning you get.

What warranty do these cabinets carry?

Every Focal cabinet here is Performance Optimized, which carries a 1-year limited warranty on the enclosure from the date of purchase.

Subwoofer Boxes by Brand

Every box is cut to one driver's published specs. Pick the brand your subwoofer comes from.

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Amplifiers to Power These Drivers

Monoblock Power for the Subwoofers Above

Monoblock amplifiers spec'd for the RMS power requirements and impedance characteristics of the subwoofers in this collection. Match RMS to RMS, set gain correctly, get the most out of your driver.

Rainbow Audio Dream 0.5K Mono Class D Amplifier

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Rainbow Audio Dream 0.5K Mono Class D Amplifier

$ 89.99 $ 399.99
US Acoustics Lisa 4 Channel Class AB Amplifier 4 x 50w US Acoustics

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US Acoustics Lisa | 4 Channel Class AB Amplifier | 4 x 50w

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US Acoustics Wendy 2 Channel Class AB Amplifier 2 x 75w US Acoustics

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US Acoustics Wendy | 2 Channel Class AB Amplifier | 2 x 75w

$ 159.99
Prodigy Audio 600 Watt 4 Channel Amplifier NBM100.4 - Prodigy Amplifier for car audio systems

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Prodigy Audio 600 Watt 4 Channel Amplifier | NBM100.4

$ 225.99 $ 270.99

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Last updated September 26, 2026