Ported, 15 Inch

Ported 15 Inch Subwoofer Boxes

Ported cabinets for 15 inch drivers with the tuning frequency on every card, standard and wedge. CNC-cut in Tullahoma.

Ported 15 inch Proline X subwoofer enclosure

Ported, 15 Inch

A ported 15 inch subwoofer box adds a tuned vent so the cabinet gives more output around its tuning frequency than the same driver sealed, for the same amplifier. The port is sized to the driver's excursion and power, and every listing on this page states its tuning, because two cabinets of the same volume tuned five hertz apart are different products.

A fifteen wants airspace, so the wedge leads at this size: a tall cabinet has to lean on something, and the seat back is the obvious wall. Depth and net volume are the numbers to read before anything else. CNC-cut in Tullahoma, Tennessee from Langboard Elite MDF on our own ShopSabre routers. Ported cabinets ship dry.

Ported 15 inch cabinets in stock today | single and dual | standard and wedge | Performance Optimized and Professional | tuning stated per cabinet

Cut, assembled, carpeted and shipped from our own shop in Tullahoma, Tennessee. Stock counts on every card are shelf counts. Ported cabinets ship dry, with the tuning on the listing. Limited warranty runs by series from the original date of purchase: one year on Performance Optimized; two years on Professional.

Specified and written by Scott Welch, IASCA National and MECA World Champion, who runs the CNCs these are cut on. Figures come from our own build sheets and the driver manufacturers' published parameters.

Decision Shortcut

Find Your Match

Curated picks matched to common build goals

Best Value

Proline X PO 15-P W SQL15 ported wedge, front baffle with gloss black insert and pre-wired leads, 30 by 18.5 inches.

Proline X

Stereo Integrity SQL-15 Box: Ported 15" Wedge Enclosure

Stereo Integrity SQL-15. The lowest-priced ported 15 inch cabinet on the page, wedge orientation, 1.9 cubic feet net.

$ 499.99

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Best for Trucks

Proline X PO 15-P W 3XL1501D ported wedge, front baffle with gloss black insert and pre-wired leads, 30 by 18.5 inches.

Proline X

PowerBass 3XL-1501D Box: Ported 15" Wedge Enclosure

PowerBass 3XL-1501D. A wedge cabinet tapered to sit flush against a seat back, tuned to 32.5 Hz.

$ 499.99

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Shallowest Cabinet

Proline X PO 15-P W L1504D ported wedge, front baffle with gloss black insert and pre-wired leads, 30 by 18.5 inches.

Proline X

PowerBass L-1504D Box: Ported 15" Wedge Enclosure

PowerBass L-1504D. 15.9 inches deep, among the shallowest ported 15 inch cabinets in stock, for openings a standard box will not take.

$ 499.99

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Lowest Tuning

Proline X PO 15-P W M1504 ported wedge, front baffle with gloss black insert and pre-wired leads, 30 by 18.5 inches.

Proline X

PowerBass M-1504 Box: Ported 15" Wedge Enclosure

PowerBass M-1504. Tuned to 28 Hz, the lowest on the page, for a driver whose free-air resonance earns it.

$ 499.99

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Sealed or Ported at 15 Inches

Same driver size, same shop, same materials. The alignment changes the cabinet, what the listing has to tell you and what you do at the amplifier. This page is the ported half; the sealed 15 inch page is the other.

Sealed and ported 15 inch Proline X cabinets as built, 5 September 2026.
Sealed 15 inchPorted 15 inch
Net volumeSmaller for the same driverLarger, with the port's own volume added
PolyfillInstalled on every buildNone. Ships dry so the tuning holds
Tuning statedNo, a sealed box has noneYes, on every listing
OutputFlat passband, gentle 12 dB per octave roll-offMore output around tuning for the same power
Subsonic filterAn improvementA requirement, set just under tuning
Pick it whenSpace is tight, music is wide, or you want a dualThe space is there and output per watt matters

Shared across both: Langboard Elite MDF at 48.5 lbs per cubic foot, 200 psi internal bond and 410,000 psi MOE, cut on ShopSabre routers in Tullahoma and carpeted in house.

What a Port Does for a 15 Inch Driver

Below its tuning frequency a ported box unloads the cone; above it the port and the cone work together and the cabinet gives more output per watt than a sealed box of the same driver. The tuning on this page runs 28 to 34.5 Hz, chosen for the car rather than for a chart: a vehicle adds roughly 12 dB per octave below about 45 Hz, so a very low tuning doubles up on what the cabin already does and leaves the 40 to 60 Hz region thin.

Port area is sized against the driver's excursion and power so air speed in the vent stays low enough not to chuff at full stroke. Change the port and you have a different enclosure, which is why each listing states its own tuning and why we do not recommend retuning one.

Ported cabinets ship dry on purpose. Damping material changes the volume the port is tuned against, so a stuffed ported box is a mistuned box.

How to Choose a Ported 15 Inch Enclosure

Start from the driver

Every driver-matched cabinet here is cut to one driver's published parameters and states its tuning. Pick the driver first and the enclosure follows. The brand filter shows every driver line we cut this size for.

Read the tuning, not just the volume

The tuning frequency tells you how the box will sound in the car; the volume only tells you how big it is. On this page tuning runs 28 to 34.5 Hz, and the lower end of that range is for drivers with a low free-air resonance, not for every driver.

Ported or sealed

Ported gives more output around its tuning for the same power from a larger cabinet, and asks for a subsonic filter. If depth or height is the limit, the sealed 15 inch page usually wins. If the space is there and output per watt matters, this is the page.

Do not add polyfill

Every sealed cabinet we build ships with polyfill. These ship dry: damping material changes the volume the port is tuned against, so stuffing a ported box moves the tuning without shortening the port.

Will a Ported 15 Inch Box Fit

Three measurements decide it, and they are all on the listing.

Depth

Depth on this page runs from about 15.7 to 22.8 inches. Measure the space where the box will sit, not at the opening, because wheel wells, seat brackets and the taper of a trunk floor narrow it toward the back. A shallow-mount driver gets a shallower cabinet, which is why the same size differs by several inches from one card to the next.

Orientation

A standard cabinet fires forward and stands on its base. A down-fire cabinet mounts the driver on the bottom baffle and sits on feet that set the floor clearance. A wedge is tapered on the rear panel so it leans flush against a seat back, which is what makes it the truck cabinet. This page carries standard and wedge builds; the filters narrow it.

Driver count

Single and dual cabinets are on this page. A dual is two drivers sharing one cabinet; the listing states the net volume, so on a dual check whether the figure is per chamber or for the whole box. Two smaller drivers in one cabinet is often the better answer than one larger driver where height is the limit.

A subsonic filter on the amplifier

Below its tuning a ported box stops loading the cone and excursion runs away. Set the amplifier's subsonic filter just under the tuning frequency stated on the listing. On a sealed build the same filter is an improvement; on a ported one it is a requirement.

Two Shapes, Two Series

The page spans standard and wedge cabinets from the Performance Optimized and Professional lines, in single and dual configurations. Brands we cut ported 15 inch cabinets for include PowerBass and Kicker; the card says whether we stock the driver as well, because the box is the product and it has to be right on its own.

Limited warranty runs by series from the original date of purchase: one year on Performance Optimized; two years on Professional.

The straight cabinet

Standard 15 inch, ported

single, ported·From $759.99

Fires forward, stands on its base. The shape for a trunk with height or a cargo floor with room behind the seat.

2 year limited warranty on Professional

Leans on the seat back

Wedge 15 inch, ported

single, ported·From $479.99

Tapered on the rear panel to sit flush against a seat. The truck cabinet, and the shape that leads at the larger sizes.

1 year limited warranty on Performance Optimized

Prices are the lowest in stock for each shape today. Depth, net volume and, on ported builds, tuning are what change from card to card.

Categories

Keep Reading

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

Ported 15 Inch Box Questions

What tuning frequency are these 15 inch boxes?

Each listing states its own, and across this page tuning runs 28 to 34.5 Hz. That is deliberate: a vehicle adds roughly 12 dB per octave below about 45 Hz, so tuning near the driver's own resonance keeps the cone quiet where the port is doing the work instead of doubling up on what the cabin already does.

How big is a ported 15 inch subwoofer box?

Net volume on this page runs 1.9 to 5 cubic feet for a single-driver cabinet, quoted for the box, and every listing states its own. A ported cabinet is larger than a sealed one for the same driver because the port needs volume of its own and the alignment wants more air behind the cone.

Do these ship with polyfill?

No, and do not add any. Every sealed cabinet we build ships with polyfill, but damping material changes the volume a port is tuned against. Stuff a ported box and you move the tuning without shortening the port, which gives you a mistuned enclosure rather than a bigger-sounding one.

Do I need a subsonic filter?

Yes. Below its tuning frequency a ported box stops loading the cone and excursion runs away toward the driver's limits. Set the amplifier's subsonic filter just under the tuning stated on the listing. On a sealed build the same filter is an improvement; on a ported one it is a requirement.

Do you make dual ported 15 inch boxes?

Yes. This page carries dual cabinets alongside the singles. A ported dual shares one tuned chamber, so the stated tuning applies to both drivers.

What is the warranty on a ported 15 inch box?

Limited warranty runs by series from the original date of purchase: one year on Performance Optimized; two years on Professional. It covers structural failure and manufacturing defects for the original purchaser.

Subwoofer Boxes by Brand

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

Drivers Built to Match

15 Inch Subwoofers Spec'd for These Ported Boxes

The drivers below are matched to the enclosures above by Thiele-Small parameters. Buying together guarantees the alignment, port tuning, and damping work the way the engineering intended.

Prodigy Audio 1200 watt 15 inch Subwoofer NB5 Series - Prodigy Subwoofer for car audio systems

Prodigy Audio

Prodigy Audio 1200 watt 15 inch Subwoofer | NB5 Series

$ 434.99 $ 520.99
Image Dynamics IDMAX15 V4 15 inch Subwoofer

Image Dynamics

Image Dynamics IDMAX15 V4 15 inch Subwoofer

$ 679.99

View all 15 inch subwoofers | Need a custom build? Contact us

Amplifiers for the System

Power for Your Subwoofer System

Monoblock amplifiers matched to the power requirements of the drivers these enclosures are built for. Buy the enclosure, match the driver, pick the right amplifier.

Prodigy Audio 1200 Watt Mono Block Amplifier NBM1200.1 - Prodigy Amplifier for car audio systems

Prodigy Audio

Prodigy Audio 1200 Watt Mono Block Amplifier | NBM1200.1

$ 272.99 $ 326.99
Wavtech Link5001Mini

Wavtech

Wavtech Link5001Mini

$ 299.99
US Acoustics Mike 1500w Monoblock Amplifier US Acoustics

US Acoustics

US Acoustics Mike 1500w Monoblock Amplifier

$ 329.99
Image Dynamics SQ600.1D 600W Mono Block Amplifier

Image Dynamics

Image Dynamics SQ600.1D 600W Mono Block Amplifier

$ 399.99

View all monoblock amplifier | Need a custom build? Contact us

Amplifiers for the System

Power for Your Subwoofer System

Monoblock amplifiers matched to the power requirements of the drivers these enclosures are built for. Buy the enclosure, match the driver, pick the right amplifier.

Rainbow Audio Dream 0.5K Mono Class D Amplifier

Rainbow

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

US Acoustics

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

$ 159.99
US Acoustics Wendy 2 Channel Class AB Amplifier 2 x 75w US Acoustics

US Acoustics

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

Prodigy Audio

Prodigy Audio 600 Watt 4 Channel Amplifier | NBM100.4

$ 225.99 $ 270.99

View all car amplifiers | Need a custom build? Contact us

Last updated September 5, 2026