The output end of the range

15 Inch Subwoofer Boxes

Fifteen inch cabinets, mostly wedge, CNC-cut in Tullahoma, Tennessee.

15 inch Subwoofer Enclosure - Audio Intensity

The output end of the range

A fifteen is not a louder twelve. It moves substantially more air for the same excursion, which means it reaches its output with less cone travel and less distortion, and it asks for a cabinet volume that rules out most of the places a twelve would go.

Sealed and ported, mostly wedge, machined in Tullahoma, Tennessee, to the parameters published for the driver each cabinet names.

15 inch cabinets in stock | sealed and ported | wedge leads the range | single and dual | driver-matched and direct fit | cut in Tullahoma

Cut, assembled and finished in Tullahoma, Tennessee, on ShopSabre routers from Langboard Elite MDF.

Net volume for a driver-matched cabinet is calculated from the parameters the driver manufacturer publishes for that model. Universal-cutout cabinets are cut to a standard cutout and a stated volume range instead.

Decision Shortcut

Find Your Match

Curated picks matched to common build goals

Best 15 Inch Sealed

Proline X Performance P15-S Sealed Enclosure for 15-inch Subwoofers

Proline X

Proline X P15-S | Single 15" Sealed Subwoofer Enclosure | V3

Performance Series single 15 inch sealed V3. Universal fit for any standard 15 inch driver, the most accessible 15 inch option.

$ 219.99

View Details

Best 15 Inch for SPL

Proline X placeholder graphic reading Photos Coming Soon over a United States flag, product photography pending.

Proline X

Proline X Enclosure | X Series | Fits Kicker Solo X 15" Subwoofer

Professional Series ported enclosure for the Kicker Solo X 15. Competition-grade construction with double-baffle and Solo X-matched threaded inserts.

$ 999.99

View Details

Best 15 Inch for ResoNix Owners

Proline X Micro Series 15" Sealed Enclosure - Fits ResoNix GUS 15 - Proline X Subwoofer Enclosures for car audio systems

Proline X

Proline X Micro Series 15" Sealed Enclosure | Built for ResoNix GUS-15

Built for the ResoNix GUS 15. We build for drivers we don't sell, no questions asked. Stack-fab construction, GUS 15 matched.

$ 349.99

View Details

Shop the Lineup

←
→

All products loaded

15 Inch Enclosures by Series

The series decides how the cabinet is built and how much bracing it carries. At this size the bracing is doing real work, because the panel areas are large and the pressures are high.

Every active 15 inch cabinet in stock, 29 August 2026.
SeriesFront baffleCutoutBest for
Performance Optimized1.5 in doubleCut to one driverYou know the driver and want the box matched to it
ProfessionalDouble or tripleCut to one driverReference builds where the cabinet is the point
Micro Series1.5 inCut to one driverThe rare shallow-mount fifteen, where depth is fixed by the vehicle
Performance0.75 in singleUniversalA universal cutout when the driver is not decided
Vehicle SpecificVaries by platformCut to one driverDirect fit in a named vehicle and year range

Shared across every row: Langboard Elite MDF cut on ShopSabre routers in Tullahoma, Tennessee. Plush black carpet. A Proline X ABS and carbon fibre composite terminal cup with stainless hardware, pre-wired in 12-gauge OFC. Construction method varies by series and is stated on each product page.

The Only Size Where Wedge Is the Majority

On every other page the wedge is a minority shape. At fifteen inches it is the most common one here, and that follows directly from the geometry: a cabinet this tall has to lean on something, and a taper on the rear panel turns dead space behind a seat back into usable volume.

The baffle stays vertical, so the driver still fires forward. What the taper buys is depth at the bottom of the cabinet where the vehicle has room for it, and clearance at the top where it does not.

How to Choose a 15 Inch Enclosure

Confirm the volume before anything else

This is the size where the cabinet decides whether the build is possible. Published external dimensions are on every listing and they are the first thing to check, not the last.

Then pick the shape

Wedge if there is a seat back or bulkhead to sit against, which is the common case at this size. Standard front-firing if the space is a plain rectangle. Down-fire only where the floor is flat and the extra height is available.

Then sealed or ported

Sealed keeps a fifteen tight and controlled in the smallest cabinet the alignment allows. Ported adds output around the tuning frequency and adds volume to do it. At this size that extra volume is what usually settles it.

Then match the amplifier honestly

A fifteen reaches its output with less cone travel than a twelve, which makes it easy to underestimate what it wants. Work from the driver RMS at your final wired impedance rather than from peak figures.

Single or dual

A dual fifteen is something you plan the vehicle around. Each chamber is still cut to the volume the driver wants, so the cabinet is genuinely large rather than a single split in half.

Volume, Then Shape, Then Driver

Volume is the constraint, not depth

At smaller sizes mounting depth eliminates the most options. At fifteen inches it is sheer cabinet volume. Measure the whole opening, not just the face, and remember a ported fifteen needs room for the port on top of its net volume.

Then the shape the space allows

Wedge is the most common shape here because a cabinet this tall usually has to lean on something. Standard front-firing works where the space is a plain rectangle deep enough to take it. Down-fire is rare at this size, because the feet clearance adds to a height that is already the problem.

Then the driver model

Two fifteen inch drivers want different volumes and the gap between them is larger in absolute terms than at any smaller size, so getting the model right matters more here. The product page names the driver each cabinet was cut for.

Wedge Leads at Fifteen Inches and Nowhere Else

A cabinet this tall usually has to lean on something, and a taper on the rear panel turns dead space behind a seat back into usable volume. The baffle stays vertical so the driver still fires forward. That is why the shape that is a minority at every other size is the majority at this one.

Plan the Space Before the Driver

Net volumes at this size run to figures that will not fit a sedan trunk without planning, and a ported fifteen needs room for the port on top of its net volume. Measure the whole opening rather than the face, and settle the cabinet before you settle the driver.

Driver-Matched, and Volumes That Need Planning

Performance Optimized is the bulk of the range, cut to one driver on a 1.5 inch double baffle. Professional sits above it with heavier baffle and bracing work for the drivers that justify it, and Micro Series covers the rare shallow-mount fifteen. There is a direct-fit under-seat build as well, which is unusual enough to be worth its own look.

Net volumes here run to figures that will not fit a sedan trunk without planning. That is the trade a fifteen asks for, and it is why the shape and the space matter more on this page than the driver brand does.

Driver-matched

Performance Optimized Series

The bulk of the range

The bulk of the fifteen inch range. Each cabinet is cut to one driver published parameters on a 1.5 inch double baffle, mostly as a wedge.

Cut to one driver

Reference build

Professional Series

Reference builds

Heavier baffle and internal bracing, which does real work at this size because the panel areas are large and the pressures are high.

Cut to one driver

Shallow mount

Micro Series

Shallow-mount builds

The rare shallow-mount fifteen, stack-fabricated with dowel reinforcement for a space whose depth the vehicle decides.

Cut to one driver

Baffle thickness and construction method vary by series. Each product page states how that cabinet is built and, where it is driver-matched, which model it was cut for.

Categories

Keep Reading

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

15 inch Subwoofer Box Questions

Is a 15 inch subwoofer worth it over a 12?

If you have the volume for it. A fifteen moves substantially more air for the same excursion, so it reaches its output with less cone travel and less distortion. What it asks for is cabinet volume, and a fifteen in a box too small for it will be beaten by a twelve in the right one.

Why are most of these wedge shaped?

Geometry. A cabinet this tall usually has to lean on something, and a taper on the rear panel turns dead space behind a seat back into usable volume while keeping the baffle vertical so the driver still fires forward. At smaller sizes the wedge is a minority shape; at fifteen inches it is the common one.

How much space does a 15 inch box need?

More than most vehicles have without planning for it, and a ported fifteen needs room for the port on top of its net volume. Published external dimensions are on every listing. This is the size where the space decides whether the build is possible at all.

Can a 15 go under a seat?

In specific trucks, with a shallow-mount driver and a cabinet cut for that exact cab, yes. There is a direct-fit under-seat build in this range. Do not assume the same is possible with a conventional fifteen inch driver, because the geometry only works when the driver is shallow enough.

What amplifier does a 15 need?

Work from the driver RMS at your final wired impedance rather than from peak figures. A fifteen reaches its output with less cone travel than a twelve, which makes it easy to underestimate what it wants. A monoblock rated at the driver RMS at that impedance is the standard approach.

Are these sealed or ported?

Mostly sealed, with a ported group for the drivers built to take that loading. Every sealed cabinet ships with polyfill already installed. Ported cabinets need more airspace again for the same driver, which is a real consideration at this size.

Related Collections

If the volume is not there

Browse curated picks that work with the products above.

Proline X E12-S Sealed Enclosure

Proline X

Proline X E12-S Sealed Enclosure

$ 129.99 $ 159.99
Proline X Performance Wedge P12-WS III Sealed Enclosure for 12" Subwoofers Proline X

Proline X

Proline X Performance Wedge P12-WS III Sealed Enclosure for 12" Subwoofers

$ 169.99 $ 179.99
Proline X down fire subwoofer enclosure in black plush carpet, unloaded, interior baffle engraved PDF 12-S 1.1FT.

Proline X

Proline X P12-S DF | Single 12" Sealed Down Fire Subwoofer Enclosure

$ 179.99
Proline X Performance P12 - S Sealed Enclosure for 12-inch Subwoofers

Proline X

Proline X P12-S | Single 12" Sealed Subwoofer Enclosure | V3

$ 179.99

View all 12 inch subwoofer boxes | Need a custom build? Contact us

Related Collections

The shape that leads at this size

Browse curated picks that work with the products above.

Proline X Performance Wedge P12-WS III Sealed Enclosure for 12" Subwoofers Proline X

Proline X

Proline X Performance Wedge P10-WS III Sealed Enclosure for 10" Subwoofers

$ 159.99 $ 179.99
Proline X Performance Wedge P12-WS III Sealed Enclosure for 12" Subwoofers Proline X

Proline X

Proline X Performance Wedge P12-WS III Sealed Enclosure for 12" Subwoofers

$ 169.99 $ 179.99
Dual Arc Audio X2 12 + Matching Proline X Enclosure Bundle, Box 50% Off - Proline X Subwoofer Enclosures for car audio systems

Proline X

Proline X Performance Wedge P12-WDS III Sealed Enclosure for Dual 12" Subwoofers

$ 229.99
A Proline PO 10-S W CompQ subwoofer enclosure shown on a dark promotional graphic with dimensions labeled 26.25 inches by 18 inches and feature text on the left.

Proline X

Performance Optimized Wedge Sealed 10" Enclosure | Kicker CompQ 10

$ 229.99

View all wedge subwoofer boxes and enclosures | Need a custom build? Contact us

Related Collections

Pairs Well With This Collection

Browse curated picks that work with the products above.

Professional Series 6.5 inch Subwoofer Box

Proline X

Professional Series 6.5 inch Subwoofer Ported Box

$ 199.99
Professional Series Dual 6.5 inch Subwoofer Box

Proline X

Professional Series Dual 6.5 inch Subwoofer Ported Box

$ 249.99
Professional Series Enclosure Image Dynamics IDMAX 10 Sealed Box

Proline X

Proline X Enclosure | Professional Series | Fits Image Dynamics IDMAX 10" Subwoofer

$ 249.99 $ 279.99
Professional Series 8-inch ported enclosure for Digital Designs, front view with gloss baffle and slot port

Proline X

Proline X - Professional Series 8 inch Ported Enclosure for Digital Designs

$ 299.99 $ 329.99

View all professional series subwoofer boxes | Need a custom build? Contact us

Last updated August 29, 2026