Ported, Standard Front-Firing

Ground Zero Subwoofer Boxes and Enclosures

Ported enclosures cut for Ground Zero subwoofers, CNC-machined in Tullahoma, Tennessee.

Proline X subwoofer enclosures built for Ground Zero subwoofers.

Ported, Standard Front-Firing

These are ported cabinets cut for Ground Zero subwoofers, machined in Tullahoma, Tennessee to the parameters Ground Zero publishes for the driver each one names.

Both are standard front-firing builds, and both have the port cut and tuned as part of the design rather than added to a sealed box afterwards.

Ported Ground Zero enclosures in Performance Optimized and Professional Series, standard front-firing, with the port tuned per cabinet.

Cut, assembled and finished in Tullahoma, Tennessee, to the parameters Ground Zero publishes for each driver.

Driver parameters are taken from Ground Zero published data. We stock Ground Zero subwoofers and cut enclosures to those figures.

Shop the Lineup

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Ground Zero Enclosures at a Glance

Both cabinets are ported and standard front-firing. What separates them is the build standard and the driver each is cut for.

Ported Ground Zero cabinets in stock; check the product page for current availability.
Performance OptimizedProfessional Series
AlignmentPorted, tuned per cabinetPorted, tuned per cabinet
Baffle1.5 in doubleHeavier baffle and bracing
OrientationStandard front-firingStandard front-firing
ConfigurationSingle, multiple variantsSingle

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.

Ground Zero Subwoofer Box Directory by Model

We build sealed and ported enclosures for 10 Ground Zero subwoofer models, 8 to 15 inch, in wedge, down-fire and standard styles from single, dual, triple and quad woofer cabinets. Open a model to see every box cut for it, with net volume, tuning and outside dimensions. Full specs and fitment notes are on each product page.

Ground Zero GZHW 20 3 boxes
BoxSeriesNet volumeTuningOutside dimensions
Wedge Sealed, SinglePerformance Optimized0.28 ft³Sealed10.97" W x 11.75" H x 12.07" D, tapering to 7.79"
Wedge Wide Sealed, TriplePerformance Optimized1.48 ft³Sealed40" W x 13" H x 12.27" D, tapering to 7.54"
Wedge Wide Sealed, QuadPerformance Optimized1.64 ft³Sealed44" W x 13" H x 12.27" D, tapering to 7.54"
Ground Zero GZHW 25 3 boxes
BoxSeriesNet volumeTuningOutside dimensions
Wedge Sealed, SinglePerformance Optimized0.49 ft³Sealed13.29" W x 13" H x 13.57" D, tapering to 8.84"
Wedge Wide Sealed, TriplePerformance Optimized2.36 ft³Sealed40" W x 17" H x 14.24" D, tapering to 8.05"
Wedge Wide Sealed, QuadPerformance Optimized2.84 ft³Sealed44" W x 17" H x 14.85" D, tapering to 8.66"
Ground Zero GZHW 30 2 boxes
BoxSeriesNet volumeTuningOutside dimensions
Wedge Sealed, SinglePerformance Optimized1.05 ft³Sealed19.45" W x 15" H x 14.70" D, tapering to 9.24"
Wedge Wide Sealed, TriplePerformance Optimized3.14 ft³Sealed44" W x 17" H x 15.92" D, tapering to 9.74"
Ground Zero GZHW 38 1 box
BoxSeriesNet volumeTuningOutside dimensions
Standard Ported, SingleProfessional3.07 ft³34.5 Hz36.00" W x 18.00" H x 18.25" D
Ground Zero GZPW 10SQX 3 boxes
BoxSeriesNet volumeTuningOutside dimensions
Wedge Ported, SinglePerformance Optimized1.33 ft³34.0 Hz30.00" W x 13.50" H x 14.66" D, tapering to 9.75"
Wedge Wide Sealed, TriplePerformance Optimized5.24 ft³Sealed40" W x 17" H x 23.00" D, tapering to 16.81"
Wedge Wide Sealed, QuadPerformance Optimized5.89 ft³Sealed44" W x 17" H x 23.00" D, tapering to 16.81"
Ground Zero GZRW 8XSPL 2 boxes
BoxSeriesNet volumeTuningOutside dimensions
Standard Ported, SingleProfessional1.31 ft³32.5 Hz25.50" W x 14.00" H x 16.25" D
Standard Ported, DualProfessional1.76 ft³34.0 Hz34.00" W x 14.00" H x 14.25" D
Ground Zero GZRW 12XSPL 3 boxes
BoxSeriesNet volumeTuningOutside dimensions
Standard Ported, SingleProfessional1.43 ft³35.5 Hz32.00" W x 16.00" H x 11.62" D
Standard Ported, DualProfessional1.80 ft³32.5 Hz40.00" W x 16.00" H x 12.75" D
Wedge Wide Sealed, TriplePerformance Optimized5.73 ft³Sealed44" W x 17" H x 23.00" D, tapering to 16.81"
Ground Zero GZRW 250-D2 FLAT 7 boxes
BoxSeriesNet volumeTuningOutside dimensions
Down Fire Ported, SinglePerformance Optimized1.31 ft³34.5 Hz31" W x 15.50" D x 7.75" H
Wedge Ported, SinglePerformance Optimized0.93 ft³34.5 Hz30.00" W x 13.50" H x 11.91" D, tapering to 7.00"
Down Fire Sealed, SinglePerformance Optimized1.00 ft³Sealed30.00" W x 15.00" D x 7.12" H
Wedge Sealed, SinglePerformance Optimized1.00 ft³Sealed29.50" W x 13" H x 11.20" D, tapering to 6.46"
Wedge Ported, DualPerformance Optimized1.63 ft³32.5 Hz32.00" W x 15.00" H x 14.96" D, tapering to 9.50"
Down Fire Sealed, DualPerformance Optimized2.00 ft³Sealed30.00" W x 15.00" D x 12.18" H
Wedge Sealed, DualPerformance Optimized2.00 ft³Sealed32.00" W x 15" H x 14.97" D, tapering to 9.51"
Ground Zero GZRW 300-D2 FLAT 6 boxes
BoxSeriesNet volumeTuningOutside dimensions
Down Fire Ported, SinglePerformance Optimized1.44 ft³34.0 Hz31" W x 17.00" D x 7.75" H
Wedge Ported, SinglePerformance Optimized1.23 ft³32.5 Hz30.00" W x 15.50" H x 13.02" D, tapering to 7.38"
Down Fire Sealed, SinglePerformance Optimized1.34 ft³Sealed30.00" W x 15.00" D x 8.82" H
Wedge Sealed, SinglePerformance Optimized1.34 ft³Sealed29.50" W x 15" H x 12.42" D, tapering to 6.96"
Down Fire Sealed, DualPerformance Optimized2.69 ft³Sealed30.00" W x 15.00" D x 15.66" H
Wedge Sealed, DualPerformance Optimized2.69 ft³Sealed32.00" W x 16" H x 17.53" D, tapering to 11.70"
Ground Zero GZTW 12F 2 boxes
BoxSeriesNet volumeTuningOutside dimensions
Wedge Ported, SinglePerformance Optimized1.66 ft³34.0 Hz30.00" W x 15.50" H x 15.02" D, tapering to 9.38"
Wedge Wide Sealed, TriplePerformance Optimized5.88 ft³Sealed44" W x 17" H x 23.00" D, tapering to 16.81"

Ported, With the Port Designed In

Port length and cross-sectional area together set the tuning frequency, and that frequency is chosen for one specific driver. Around it the port radiates alongside the cone and the cabinet produces more output than a sealed box of the same size. Below it the port unloads the cone and output falls away.

The cost is volume. A ported cabinet needs more airspace than a sealed one for the same driver, because the port lives inside it and the alignment needs the room. If your space will not take that, a sealed cabinet in the same spot will do better than a ported one squeezed to fit.

Every Ground Zero Model We Build For

10 Ground Zero models, each with its own cabinets. Ported tunings are the frequency each box is tuned to.

8 inch

GZHW 20: sealed wide wedge in triple and quad; sealed wedge in single. GZRW 8XSPL: ported standard in single and dual at 32.5 to 34 Hz.

10 inch

GZHW 25: sealed wide wedge in triple and quad; sealed wedge in single. GZPW 10SQX: sealed wide wedge in triple and quad; ported wedge in single at 34 Hz. GZRW 250-D2 FLAT: sealed wedge in single and dual; sealed down-fire in single and dual; ported wedge in single and dual at 32.5 to 34.5 Hz; ported down-fire in single at 34.5 Hz.

12 inch

GZHW 30: sealed wide wedge in triple; sealed wedge in single. GZRW 12XSPL: sealed wide wedge in triple; ported standard in single and dual at 32.5 to 35.5 Hz. GZRW 300-D2 FLAT: sealed wedge in single and dual; sealed down-fire in single and dual; ported wedge in single at 32.5 Hz; ported down-fire in single at 34 Hz. GZTW 12F: sealed wide wedge in triple; ported wedge in single at 34 Hz.

15 inch

GZHW 38: ported standard in single at 34.5 Hz.

How to Choose

Confirm the space takes a ported cabinet

Ported needs more airspace than sealed for the same driver. That is the first thing to establish.

Read the variant, not just the title

A listing here offers more than one driver size and configuration under a single product. The variant you pick determines the cabinet you get.

Check the tuning frequency

Two cabinets of the same net volume tuned a few hertz apart are different products. The stated tuning tells you where the cabinet does its best work.

Check current availability

Stock on this range moves. The product page shows the current position rather than this one.

Airspace, Tuning and the Model

Airspace decides whether ported is possible

The cabinet has to hold the net volume the alignment needs plus the port itself. Measure the opening before anything else, because this is the constraint that rules the alignment in or out.

Then the tuning frequency

Lower tuning extends deeper and gives up midbass impact; higher tuning does the reverse. It is fixed by the port rather than adjustable afterwards, and each listing states what its cabinet is tuned to.

Then confirm the Ground Zero model

A cabinet here covers more than one driver size across its variants, so read the variant as well as the product title. The product page states which Ground Zero model and which configuration each option is cut for.

The Port Is Tuned, Not Just Cut

Port length and area together produce a specific tuning frequency for a specific Ground Zero driver, and the area is sized for the excursion that driver is rated to. A port too small for the excursion will make noise at volume, and no amount of tuning afterwards removes it.

A Listing Can Cover Several Variants

A cabinet here is offered in more than one driver size and configuration under a single product, so the variant you choose decides the enclosure you receive. Read the variant as well as the product title before ordering.

Two Build Standards, Both Ported

A Performance Optimized cabinet on a 1.5 inch double baffle, and a Professional Series build with heavier baffle and bracing work. Both standard front-firing, both single-driver.

Port area is sized for the excursion the driver is rated to rather than for a convenient number, because a port too small for the excursion will make audible noise at volume and no tuning afterwards removes it.

Driver-matched

Performance Optimized Series

Ported

Cut to one driver on a 1.5 inch double baffle, with the port tuned for that driver rather than to a generic figure.

Cut to one driver

Heavier build

Professional Series

Ported

More baffle and more internal bracing, which a ported alignment rewards more than a sealed one does.

Cut to one driver

Built to order

Other configurations

Contact us

Everything is CNC-cut to order in Tullahoma. Ask if you need a size or configuration that is not listed.

Made to order

Baffle thickness and construction method vary by series. Each product page states how that cabinet is built and which Ground Zero model it was cut for.

Categories

Keep Reading

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

Ground Zero Subwoofer Box Questions

Which Ground Zero subwoofers do these boxes fit?

Each cabinet is cut to the published parameters of a specific Ground Zero model, named on its product page. A listing here covers more than one driver size across its variants, so read the variant as well as the title.

Are these sealed or ported?

Both are ported, with the port cut and tuned as part of the design. Around the tuning frequency a ported cabinet produces more output than a sealed box of the same size; below it, output falls away steeply.

Why does a ported box need more space?

Because the port has to fit inside the cabinet and the alignment itself needs more net volume to work. If your space will not take the larger cabinet, a sealed enclosure in that space will outperform a ported one that was shrunk to fit.

What is the difference between the two builds?

One is a Performance Optimized cabinet on a 1.5 inch double baffle. The other is Professional Series, with heavier baffle and internal bracing work. Both are cut to the published parameters of the driver they name.

Can I modify the port to change the tuning?

We do not recommend it. Port length and area are cut to produce a specific tuning for a specific driver, and altering either leaves you with an alignment nobody designed.

Do you stock Ground Zero products?

We hold some Ground Zero stock. Availability on this range moves, so the product page shows the current position rather than this one.

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

10 Inch Subwoofers We Stock

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 NB3-10 | 10 inch Shallow Mount Subwoofer | 3" Mounting Depth

$ 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 We Stock

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

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
Rainbow Audio SL-M2 2 channel micro amplifier

Rainbow

Rainbow Audio SL-M2 2 channel micro amplifier

$ 98.99 $ 549.99
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 October 10, 2026