Three Drivers, One Cabinet

Triple 12 Inch Subwoofer Boxes

Triple 12 inch subwoofer boxes, CNC-cut in Tullahoma, Tennessee.

Triple 12 inch subwoofer box built by Proline X in Tullahoma, Tennessee

Three Drivers, One Cabinet

Three twelves is what people reach for when the whole back wall of the cab is available and they want all of it working. It is a little less cone area than two fifteens, and the cabinets run the full practical width, so the opening settles this one before anything else does.

Every cabinet on this page is sealed and holds three 12 inch drivers, each in its own chamber behind a bonded full-height divider. The driver-matched cabinets are cut from the parameters the driver's maker publishes. Each listing states the net volume for the whole cabinet and the figure per chamber, which is what one driver actually works into.

Sealed triple 12 inch cabinets, wedge, 44 inches wide.

Cut, assembled and finished in Tullahoma, Tennessee. Shipping included.

Driver-matched cabinets are cut from the parameters each driver's maker publishes. Enclosure only unless the listing says loaded.

Decision Shortcut

Find Your Match

Curated picks matched to common build goals

Best Value

Proline X PO 12T-S W 2XL1204D sealed wedge enclosure, product photos pending. Placeholder graphic reading Photos Coming Soon.

Proline X

PowerBass 2XL-1204D Triple Box: Sealed 12" Wedge Wide Enclosure

The lowest-priced triple 12 inch cabinet in stock, $489.99.

$ 489.99

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Best for SQ

Proline X PO 12T-S W 12W7AE sealed wedge enclosure, product photos pending. Placeholder graphic reading Photos Coming Soon.

Proline X

JL Audio 12W7AE Triple Box: Sealed 12" Wide Wedge Enclosure

Each driver gets its own sealed chamber, cut from the parameters JL Audio publishes for this driver, so none of the three loads another.

$ 639.99

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Top of the Range

Proline X PO 12T-S W 312E sealed wedge enclosure, product photos pending. Placeholder graphic reading Photos Coming Soon.

Proline X

DD Audio 312e Triple Box: Sealed 12" Wedge Wide Enclosure

Cut for the DD Audio, at the top of this page's price ladder. Check its cutout and mounting depth on the listing against the driver you own.

$ 639.99

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Every Triple 12 Inch Build, Side by Side

The series decides the build standard and the warranty term. Prices are the lowest in stock in each series today.

Triple 12 inch cabinets by series, 12 November 2026.
SeriesChambersShapesFitWarrantyFrom
Performance OptimizedA sealed chamber per driverWedgeDriver-matched1 year limited$489.99

Every cabinet is Langboard Elite MDF, carpeted, with an ABS or carbon fibre terminal cup.

The Triple 12 Inch Range at a Glance

Performance Optimized (a sealed chamber per driver): wedge, cut for Alpine, American Bass, Arc Audio, AudioControl, Audiofrog, DD Audio and more. From $489.99.

Pricing across the page runs from $489.99 to $639.99, shipping included. The cabinets sit on one platform 44 inches wide, and every listing prints its full external dimensions. Browse the full lineup above.

Driver-matched

Performance Optimized triples

Triple 12 inch·From $489.99

Sealed, a chamber per driver. Wedge, cut to a named driver.

1 year limited warranty on Performance Optimized

Construction and chamber layout are stated on each product page.

Categories

Keep Reading

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

Triple 12 Inch Subwoofer Box Questions

Do the three drivers share one chamber?

No. Two bonded full-height dividers split the cabinet into three sealed chambers, so each driver gets its own air space and its own polyfill. The listing states the total net volume and the figure per chamber.

Is the net volume per driver or for the whole box?

The headline figure is for the whole cabinet. Each listing also gives the per-chamber volume, which is what one driver is working into and the number the alignment was solved from.

How wide is a triple 12 inch box?

Every cabinet here is 44 inches wide. Three 12 inch cutouts plus the baffle material and dividers between them do not fit across less, so there is no narrower version. Measure the narrowest point of your opening at seat-back height before anything else.

What impedance will three subwoofers give me?

Each chamber has its own terminal cup, so you choose the coil wiring on each driver and then how the three cups are joined. With the cups in parallel, three dual 4 ohm drivers reach 2.67 ohms with the coils in series or 0.67 ohms with them in parallel; dual 2 ohm drivers reach 1.33 ohms or 0.33 ohms. Joining the three cups in series instead multiplies where parallel divides, and takes the same drivers to 24 and 6 ohms, or 12 and 3. Match the final load to the amplifier's minimum stable impedance rather than chasing the lowest figure. Calculate impedance for multiple subwoofers works through any set.

Can I run different subwoofers in one cabinet?

No. Run three of the same model at the same impedance. Each chamber is cut to one driver's parameters, so a different driver in one of them changes both the volume it is working into and the load on its own cup.

Are there ported triple 12 inch boxes?

Not from us. At three drivers the extra volume a port needs no longer fits in the space that made the high driver count worth doing. Vented builds are single and dual cabinets, on the ported page.

Is a triple 12 better than two fifteens?

They move close to the same air. Three twelves spread it over more motors with less moving mass on each, which starts and stops faster and shares the heat; Two fifteens get there with fewer drivers to buy, mount and wire, and a simpler final impedance. What will physically go in the space usually settles it. The dual subwoofer setup guide covers the trade in detail.

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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Last updated November 12, 2026