Driver-Matched & Universal Fit

Sealed Subwoofer Boxes

Tight, accurate bass from sealed enclosures CNC-cut in Tullahoma, Tennessee.

Sealed Subwoofer Box

Driver-Matched & Universal Fit

A sealed enclosure trades maximum output for control. The air behind the cone acts as a spring, the roll-off is gentle and predictable, and transient response stays tight because nothing is resonating in sympathy with the driver. That is the whole argument for sealed, and it is why it remains the default for sound quality builds and for anyone who wants bass that follows the music instead of running ahead of it.

Every sealed cabinet here is cut in Tullahoma, Tennessee. Sealed is the alignment; the two things you narrow on next are how the box is oriented and which series it is built to.

Sealed enclosures in stock across six series, three orientations and six driver sizes. Every one ships with polyfill installed.

Cut, assembled and finished in Tullahoma, Tennessee. Every sealed cabinet ships with polyfill installed and is built to the published parameters of the driver it names.

Specifications on this page are counted from the live catalogue and from each driver manufacturer's published data. Where a cabinet is cut for a driver we do not sell, we build to that manufacturer's figures and make no claim to represent the brand.

Decision Shortcut

Find Your Match

Curated picks matched to common build goals

Best Sealed Box for SQ

Car audio subwoofer enclosure with American flag design on a white background

Proline X

Proline X | Image Dynamics IDMAX 12 Sealed Subwoofer Enclosure | Professional Series

Sealed Professional Series 12 inch loaded with the Image Dynamics IDMAX 12. SQL-grade construction, the reference SQ driver pairing.

$ 299.99

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Best 10 Inch Sealed Box

2 10" Subwoofer enclosures, 1 Grey 1 back

Proline X

Proline X P10-S | Single 10" Sealed Subwoofer Enclosure | V3

Performance Series single 10 inch sealed enclosure. Universal fit, Dado/V-Groove construction, ready for any 10 inch driver in the standard Qts range.

$ 169.99

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Best 12 Inch Sealed Box

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

Proline X

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

Performance Series single 12 inch sealed enclosure. Universal fit, Dado/V-Groove construction, ready for any 12 inch driver in the standard Qts range.

$ 179.99

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Best Dual Sealed Box

Proline X Performance P10D - S Sealed Enclosure for Dual 10-inch Subwoofers

Proline X

Proline X Performance P10D-S Sealed Enclosure for Dual 10" Subwoofers

Performance Series dual 10 inch sealed enclosure. One isolated chamber per driver, universal fit for 10 inch drivers in the standard Qts range.

$ 199.99

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Sealed Series Comparison

Sealed is an alignment, so it spans every series we build. Baffle thickness and cutout differ because the cabinets are made differently, not because one is a better version of another. Pick the row that matches how settled your driver choice is.

Every active sealed cabinet in stock, 28 August 2026, across three orientations.
SeriesBaffleCutoutBest for
Performance Optimized1.5 in doubleCut to one driverYou know the driver and want the box matched to it
Micro Series1.5 inCut to one driverShallow spaces where a standard cabinet will not fit
Vehicle SpecificVaries by platformCut to one driverDirect fit in a named vehicle
Performance0.75 in singleUniversalLowest entry point, or the driver is not decided
ProfessionalDouble or tripleCut to one driverReference builds where the cabinet is the point
EconomySingleUniversalA straightforward 12 inch box on a budget

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. Polyfill pre-installed on every sealed build. Construction method varies by series and is stated on each product page.

Sealed Is an Alignment, Not a Shape

This is worth separating because the two get conflated constantly. Sealed describes what the air in the cabinet does: it is a closed volume that loads the driver and rolls off at roughly 12 dB per octave below the corner. It says nothing about what the box looks like or where it sits.

Orientation is the separate question, and this collection spans all three, split fairly evenly between standard front-firing, down-fire and wedge. A wedge is still sealed. A down-fire box is still sealed. If you already know the shape you need, the orientation pages will narrow it faster than this one will.

The reason to start here instead is that the alignment is the decision that actually changes how the system sounds. Shape changes where it fits.

How to Choose a Sealed Enclosure

Start with the size

It is the fastest cut. 10 and 12 inch together are most of the collection. 15 inch is a smaller group, and there are a handful of 8, 13 and 18 inch builds.

Decide single, dual or more

A dual is not two singles bolted together. Each chamber is cut tighter than the same driver would get on its own, because the cabinet still has to fit the same space. That is deliberate, not an error in the listing.

Match the series to the job

Performance Optimized when you know the driver and want the cabinet cut to it. Performance when you want a universal cutout at the lowest entry point. Micro when depth is the binding constraint. Vehicle Specific when we have already cut one for your vehicle. Professional when the build is the point.

Check the orientation last

Standard, down-fire and wedge are all represented here and all sealed. Pick the one that suits where the box has to sit, after the driver and the series are settled.

Do not shop on volume alone

A published net volume is only meaningful next to the driver it was cut for. The same driver gets a different volume as a single than it does as a dual, and a number that looks small next to another listing is usually correct rather than stingy.

Airspace, Depth and the Driver You Already Own

Three things decide whether a sealed cabinet works for you, and the order matters.

The driver comes first

A sealed box is only correct for the driver it was cut for. Net volume determines the system Q, and a driver in the wrong volume will sound either boomy or thin no matter how well the cabinet is built. If you already own the driver, filter to it. The brand filter shows every driver line we cut for.

Then mounting depth

This is the constraint that eliminates the most options fastest. If the space under your seat or in your cargo well will not take a standard cabinet, you are in Micro Series territory and the choice narrows immediately. Measure before you shop, not after.

Then the space the box has to live in

Height, width and depth of the opening, measured with the trim in place rather than off the drawing. A cabinet that fits the cargo floor but fouls the seat back at its lowest position does not fit.

Universal-cutout cabinets are the exception to the first rule. They take any driver of the right size and depth, which is the right answer when the driver is not decided yet or when you expect to change it.

Polyfill Is Already In There

Every sealed cabinet we build ships with polyfill installed. Fill makes the enclosure behave as though it were slightly larger and damps standing waves inside the box, so it is part of the tuning rather than an accessory. Adding more is not an upgrade and taking it out is not a modification worth making.

We Cut Boxes for Drivers We Do Not Sell

A large share of the cabinets here are cut for Kicker, Hertz, Morel, Diamond Audio, NVX and Focal drivers. We build the enclosure to those drivers' published parameters, and we do not sell the drivers themselves or represent those brands. Source the driver wherever you like; the box is ours.

Six Series, Three Orientations, One Alignment

Performance Optimized is the bulk of the catalogue, each cabinet cut to one driver's published parameters on a 1.5 inch double baffle. Micro Series covers the shallow-mount builds for seats and wells that will not take a standard cabinet. Vehicle Specific is the direct-fit boxes cut to a named vehicle. Performance is the universal-cutout cabinets on a single 3/4 inch baffle. Professional is the reference builds, and Economy is the entry point.

Every sealed enclosure we build ships with polyfill already installed. That is not an upsell or an option box, and it is not something you need to add on arrival.

Universal

Performance Series

The entry point

A universal cutout on a single 3/4 inch baffle. Takes any driver of the right size and mounting depth, which makes it the right pick when the driver is not settled or when you expect to swap it later.

Universal cutout

Driver-matched

Performance Optimized Series

The bulk of the range

The bulk of the catalogue. Each cabinet is cut to one driver's published parameters on a 1.5 inch double baffle, so net volume and damping are set for that driver rather than approximated.

Cut to one driver

Reference

Professional Series

Reference builds

Double or triple baffle construction for builds where the cabinet itself is the point. The smallest group here, and the one to look at when the driver deserves it.

Cut to one driver

Baffle thickness is per series, and construction method varies by series as well. Micro and Vehicle Specific cabinets are stack-fabricated. Each product page states how that cabinet is built rather than generalising from the series.

Categories

Keep Reading

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

Sealed Subwoofer Box Questions

What is a sealed subwoofer box?

A sealed subwoofer box is a fully enclosed cabinet with no port or vent. The trapped air acts as a spring that controls cone movement, which gives a gentle roll-off of about 12 dB per octave and tighter transient response than a ported box of the same size. It trades peak output for accuracy.

Are sealed subwoofer boxes better?

Better at some things, not at everything. A sealed box gives tighter, more accurate bass, needs less airspace, and is far more forgiving of imperfect placement and of a driver whose parameters you are not certain about. A ported box gives more output around its tuning frequency. If you listen for detail and kick, choose sealed. If you want maximum volume on bass-heavy tracks, choose ported.

What hits harder, ported or sealed box?

Ported hits harder. Around the port tuning frequency a ported enclosure is roughly 3 dB more efficient, which is close to double the acoustic output for the same amplifier power. Sealed hits more accurately instead. The note starts and stops with the music rather than ringing on, which is why sealed is the standard for sound quality builds even though it measures quieter.

Does a subwoofer box have to be airtight?

A sealed box does, yes. The trapped air is the spring that controls the cone, so any leak changes the effective compliance and raises the system Qtc away from what the box was built for. Leaks also make audible chuffing under power. Every sealed cabinet we build is glued, sealed and tested, and the terminal cup is gasketed.

What happens if you drill a hole in a sealed subwoofer box?

It stops being a sealed enclosure. A hole does not turn a sealed box into a ported one, because a port is a tuned length of pipe and a bare hole is not. What you get is a leaking cabinet that loses cone control below resonance, which raises distortion and allows over-excursion at exactly the frequencies the sealed alignment was protecting the driver from. If you want ported output, buy a cabinet designed and tuned for it.

Do I need to add polyfill?

No. Every sealed enclosure we build ships with polyfill already installed. You do not need to add any, and you should not remove it. The fill is part of how the cabinet was tuned.

Can I use any subwoofer in these boxes?

It depends on the cabinet. Performance and Economy Series use a universal cutout and take any driver of the right size and mounting depth. Performance Optimized, Micro and Professional cabinets are cut to a specific driver's published parameters, so the product title names the driver they are built for. If you are unsure, call and we will confirm the fit before you order.

Drivers Built to Match

10 Inch Subwoofers for These Sealed 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 10 inch Subwoofer NB2 Series - Prodigy Subwoofer for car audio systems

Prodigy Audio

Prodigy Audio 10 inch Subwoofer | NB2 Series

$ 138.99 $ 145.99
Image Dynamics ID10 V4 10-inch Subwoofer

Image Dynamics

Image Dynamics ID10 V4 10-inch Subwoofer

$ 139.99
Prodigy Audio 10 inch Subwoofer NB3 Series - Prodigy Subwoofer for car audio systems

Prodigy Audio

Prodigy Audio 10 inch Subwoofer | NB3 Series

$ 148.99 $ 165.99
Sony XS - W104ES Mobile ES Series 10-inch 4 - ohm component subwoofer

Sony

Sony XS-W104ES Mobile ES Series 10" 4-ohm component subwoofer

$ 198.00 $ 299.99

View all 10 inch subwoofers | Need a custom build? Contact us

Drivers Built to Match

12 Inch Subwoofers for These Sealed 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 12 inch Subwoofer NB2 Series - Prodigy Subwoofer for car audio systems

Prodigy Audio

Prodigy Audio 12 inch Subwoofer | NB2 Series

$ 150.99 $ 161.99
Image Dynamics ID12 V4 12 inch Subwoofer

Image Dynamics

Image Dynamics ID12 V4 12 inch Subwoofer

$ 159.99
Arc Audio X2V2 12-inch Subwoofer

Arc Audio

Arc Audio X2V2 12" Subwoofer

$ 229.00
Image Dynamics IDQ12 V4 12 inch Subwoofer

Image Dynamics

Image Dynamics IDQ12 V4 12 inch Subwoofer

$ 280.99

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

Drivers Built to Match

15 Inch Subwoofers for These Sealed 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.

Rainbow Audio SL - M2 2 channel micro amplifier

Rainbow

Rainbow Audio SL-M2 2 channel micro amplifier

$ 89.99 $ 549.99
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

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

Last updated August 28, 2026