Compact sealed and ported

8 Inch Subwoofer Box

Sealed and ported 8 inch cabinets, single through quad, CNC-cut in Tullahoma, Tennessee.

Proline X X Series ported enclosure that fits a Kicker Solo-X subwoofer, slot port at left and US flag panel.

Compact sealed and ported

Eight inches is the size where a subwoofer stops being a compromise and starts being a choice. It fits spaces a ten will not, it takes both alignments properly, and in multiples it reaches output a single larger driver would need far more cabinet to match.

This page spans sealed and ported, single through quad, and both universal-cutout and driver-matched builds. Every cabinet is machined in Tullahoma, Tennessee.

8 inch cabinets in stock | sealed and ported | single, dual, triple and quad | universal cutout and driver-matched | 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 8 Inch Sealed Value

Proline X Performance P8-S Sealed Enclosure for 8-inch Subwoofers

Proline X

Proline X P8-S | Single 8" Sealed Subwoofer Enclosure | V2

Performance Series single 8 inch sealed enclosure on closeout. Compact sealed footprint at the most accessible price.

$ 94.00

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Best 8 Inch Sealed

Two car audio (1 black & 1 grey) subwoofer enclosures with visible brand logo on a white background

Proline X

Proline X P8-S | Single 8" Sealed Subwoofer Enclosure | V3

Performance Series single 8 inch sealed V3. Universal fit for any standard 8 inch driver, ideal for SQ-focused behind-seat installs.

$ 129.99

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Best 8 Inch Ported

Proline X P8 - P Single 8-inch Ported Subwoofer Enclosure V3 - Proline X Subwoofer Enclosures for car audio systems

Proline X

Proline X P8-P | Single 8" Ported Subwoofer Enclosure | V3

Performance Series single 8 inch ported V3. Tuned port for laminar airflow at high excursion, the right pick when output is the priority.

$ 169.99

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Best 8 Inch Dual Sealed

Two car audio subwoofer enclosures on a white background

Proline X

Proline X P8D-S | Dual 8" Sealed Subwoofer Enclosure | V3

Performance Series dual 8 inch sealed V3. Two-driver layout in a compact footprint, perfect for builds that need more output than a single 8 inch can deliver.

$ 169.99

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8 Inch Enclosures by Build Standard

Alignment and cutout are the two axes that matter at this size. Baffle thickness follows the build standard rather than the driver, so a Performance cabinet is not a worse cabinet, it is a different one.

Every active 8 inch cabinet in stock.
SeriesFront baffleCutoutAlignmentsBest for
Performance0.75 in singleUniversalSealed and portedThe driver is not decided, or the entry point is the point
Performance Optimized1.5 in doubleCut to one driverSealedYou know the driver and want the cabinet matched to it
ProfessionalDouble or tripleCut to one driverPortedReference builds where the cabinet is the point

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.

Both Alignments, Because Eight Inch Earns Both

At 6.5 inches a sealed alignment gives up too much output to be worth it. At eight it is a genuine choice. A sealed eight is tight and accurate in a cabinet small enough to hide, and a ported eight gets real output around its tuning frequency from a box that still fits under a seat.

That is why this page carries both, and why the alignment is the first thing to settle rather than the last. It changes the cabinet size you need more than the driver choice does.

How to Choose an 8 Inch Enclosure

Settle sealed or ported first

It changes the cabinet size more than anything else on this page. Sealed for accuracy in the smallest box; ported for output around the tuning frequency in a larger one.

Decide universal or driver-matched

Universal-cutout cabinets take any eight of the right size and depth, which is the right answer when the driver is not decided or you expect to change it. A driver-matched cabinet is cut to one model and gets more out of it.

Count the drivers before the inches

Single, dual, triple and quad all exist at this size. Multiples are how an eight inch build reaches output without gaining height.

Check mounting depth

This is what eliminates options fastest in the spaces an eight usually lives in. Published external dimensions and the baffle cutout are on every listing.

Do not shop on volume alone

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

Height, Depth and How Many

Height is usually what sent you here

An eight inch driver exists in the catalogue because a ten or a twelve would not fit. Measure the opening at its tightest point with trim in place, and if the cabinet is going under a fold-flat seat, measure to the seat back at its lowest position rather than its highest.

Then the alignment

Sealed is the smaller cabinet for the same driver and the more forgiving of imperfect placement. Ported is larger and louder around its tuning frequency. At eight inches the size difference between the two is small in absolute terms and large as a proportion of the space you have.

Then how many

Going from single to dual to triple to quad buys output without buying height. Each chamber is cut tighter than the same driver would get on its own, because the cabinet still has to fit the same opening. That is deliberate rather than an error in the listing.

The Only Quad Cabinet We Cut

Four eight inch drivers in one enclosure displace roughly what a pair of twelves would, in a cabinet that stays inside a height a twelve cannot. If you are working to a hard height limit and want output, going wide beats going large. Confirm your amplifier is stable at the final impedance the wiring produces.

The Cheapest Cabinet in the Catalogue Is Here

The eight inch line starts lower than any other size we cut, on a single 3/4 inch baffle with a universal cutout and V-groove and dado joinery. It is a properly built cabinet at the entry point rather than a thinner one.

Single Through Quad, Universal and Driver-Matched

This is the only size where we cut a quad cabinet. Four eight inch drivers in one enclosure displace roughly what a pair of twelves would while staying inside a height a twelve cannot, which is the whole argument for going wide rather than large.

Universal-cutout cabinets are the largest group here, taking any eight inch driver of the right mounting depth. The rest are cut to a named driver, and the product page says which. Both routes are legitimate; the universal one is right when the driver is not settled.

Universal cutout

Performance Series

The bulk of the range

A single 3/4 inch baffle with V-groove and dado joinery and a universal cutout, in both alignments. The largest group here and the lowest entry point in the whole catalogue.

Any 8 inch driver

Driver-matched

Performance Optimized Series

Cut to one driver

A 1.5 inch double baffle cut to one driver published parameters, so net volume and damping are set for that model rather than for the size class.

Sealed

Reference build

Professional Series

The ported builds

Heavier baffle and internal bracing on a ported alignment, for the drivers built to take that kind of loading.

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.

8 inch Subwoofer Box Questions

Are 8 inch subwoofers worth it?

In a space that will not take a ten or a twelve, yes, and in multiples they are competitive on output with a single larger driver. What an eight gives up is the deepest extension. What it buys is a cabinet that fits under a seat or behind one, which a twelve will not.

Should I choose sealed or ported at 8 inches?

Sealed for tighter, more accurate bass in the smallest cabinet, and it is more forgiving of imperfect placement. Ported for more output around the tuning frequency, from a larger box. At this size the difference in cabinet size is small in absolute terms but large as a proportion of the space you have.

What is the quad enclosure for?

Height limits. Four eight inch drivers in one cabinet displace roughly what a pair of twelves would while staying inside a height a twelve cannot reach. It is the answer when you want output and the opening is wide but shallow.

Can I put any 8 inch subwoofer in these?

It depends on the cabinet. Universal-cutout builds take any eight of the right size and mounting depth. Driver-matched builds are cut to one model published parameters, so the driver is part of the design rather than a choice you make afterwards. The product page says which applies.

Do dual and triple cabinets give each driver a full chamber?

Each chamber is cut tighter than the same driver would get on its own, because the cabinet still has to fit the same opening. That is a deliberate design decision rather than a data error, and the published volume reflects it.

Do these ship with polyfill?

Every sealed cabinet we build ships with polyfill already installed, and the quoted volume was calculated with it in place. Ported cabinets do not get polyfill, because it would shift the tuning the box was built around.

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Proline X E12-S Sealed Enclosure

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Last updated August 29, 2026