Cut to one driver

Proline X Performance Optimized Series Enclosures

Driver-matched cabinets on a 1.5 inch double baffle, CNC-cut in Tullahoma, Tennessee.

ProLine X - Performance Optimized Series - Audio Intensity

Cut to one driver

Performance Optimized is the build standard for a cabinet cut to one driver. Net volume comes from that model published Thiele-Small parameters rather than from a size class, the baffle cutout matches its frame, and the alignment, sealed or ported, is solved for the driver that is going in it.

It is the largest part of the Proline X range and the one most people end up in, because most people already know which subwoofer they own.

Driver-matched cabinets in stock | 1.5 in double baffle | sealed and ported | wedge, down-fire and standard | single, dual and triple | 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.

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Curated picks matched to common build goals

Best for Image Dynamics IDQ

Subwoofer in a black enclosure on a gray background

Proline X

Performance Optimized Sealed 10" Enclosure | Image Dynamics IDQ 10

Performance Optimized for the IDQ10 V4 specifically. Dimensions, port, and baffle cutout calculated for IDQ's Thiele-Small parameters.

$ 229.99

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Best for Sony Mobile ES

Car subwoofer enclosure with visible brand logo on a gray background

Proline X

Performance Optimized Sealed 10" Enclosure | Sony ES

Sealed 10 inch Sony XS-W104ES enclosure. Driver-matched fitment for the closeout-priced Mobile ES driver.

$ 199.99

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Performance Optimized by Orientation

Orientation is the real choice inside this standard. All three are solved to the same alignment for a given driver, built on the same 1.5 inch double baffle, and differ in where the cabinet can sit. Wedge and down-fire come sealed or ported; standard is sealed.

Every active Performance Optimized cabinet in stock.
OrientationBaffleAlignmentsWhat it needsBest for
Down fire1.5 in doubleSealed and portedA flat, solid floor and feet clearance counted into total heightCargo bays, open cabins, and anywhere things get stacked on the box
Wedge1.5 in doubleSealed and portedSomething angled to sit againstAgainst a seat back, a hatch or a sloped rear wall
Standard1.5 in doubleSealedNothing in particularA plain rectangular space with room to spare

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.

What Driver-Matched Actually Changes

Two ten inch subwoofers from different lines can want net volumes that differ by half a cubic foot, because compliance and resonance differ even where the cutout does not. A cabinet cut to the size class has to average across that. A cabinet cut to the driver does not have to average across anything.

What you get for it is the alignment the manufacturer designed the driver around: the intended system Q, the intended roll-off, and an enclosure that is not quietly costing you output or control. What you give up is flexibility, because the cabinet is now specific to that model.

The standard now runs both alignments. A ported Performance Optimized cabinet is solved the same way, from the driver's published parameters, with the port sized to its excursion and the tuning frequency stated on the listing. Every ported wedge and every ported down-fire we cut is built to this standard, and the sealed builds still ship with polyfill installed.

How to Choose a Performance Optimized Enclosure

Filter to your driver first

It does more narrowing than any other filter on this page, because the cabinet is defined by the driver rather than by the size.

Then single or dual

A dual is not two singles joined 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. The published volume is per chamber and that is deliberate.

Then sealed or ported

Sealed is the smaller cabinet and ships with polyfill installed. Ported gives more output around a stated tuning frequency from a deeper cabinet, ships dry, and wants a subsonic filter set just under that tuning. Ported builds are singles. The enclosure type filter splits the two here, and the ported wedge and ported down-fire pages carry each alignment on its own.

Then the shape

Pick it for the surface you have to work with rather than for sound, because all three orientations are solved to the same alignment for a given driver.

If your driver is not listed, say so

We run the routers ourselves, so a different net volume or a different cutout is a conversation rather than a special order.

Do not shop on volume alone

A published net volume only means something next to the driver it was cut for. A figure that looks small against a generic box for the same size is usually correct rather than stingy.

Driver, Then Shape, Then Space

Start from the model number, not the size

The product page names the driver each cabinet was cut for. That name is the match to work from. A ten inch cabinet cut for a different ten inch driver is the wrong cabinet, even though the cutout will line up.

Then the orientation the space allows

Down-fire aims the cone at the floor with the clearance designed in and feet that set it. Wedge tapers on the rear panel so the baffle stays vertical against a seat back. Standard front-firing is the default when neither applies. All three are solved to the same alignment for a given driver, so the orientation is a fitment choice rather than a sound choice.

Then confirm the published dimensions

External dimensions and the baffle cutout are on every listing. Measure the opening with trim in place, and on a down-fire cabinet count the feet into the total height.

The Driver Is Part of the Design

A Performance Optimized cabinet is cut to one model published parameters, so the driver is not a choice you make afterwards. That is the whole point of the standard, and it is why the product page names the subwoofer rather than just the size. If you expect to change drivers, a universal-cutout cabinet is the better buy.

We Cut for Drivers We Do Not Sell

A large share of this range is cut for brands we are not a dealer for. We build the enclosure to those drivers published parameters and you buy the subwoofer wherever suits you. The box is the product, and it has to be right on its own.

A 1.5 Inch Double Baffle, in Every Shape

Every cabinet here is built on a 1.5 inch double front baffle with the bracing that standard implies, cut from Langboard Elite MDF on ShopSabre routers in Tullahoma, Tennessee. The build is the constant; the driver and the alignment are the variables. Sealed cabinets ship with polyfill installed, ported cabinets carry a slot port tuned to the driver and ship dry.

This is also the one part of the range where standard front-firing is the minority shape. Wedge is the largest group and down-fire is close behind, because a cabinet cut to a specific driver is usually being cut to a specific space as well.

Down fire

Aimed at the floor

Almost as many

The cone faces the vehicle floor, which loads the driver against a boundary and puts the cone where cargo cannot reach it. Feet set the clearance the design needs rather than leaving it to carpet.

Needs a flat, solid floor. Sealed and ported.

Wedge

Tapered to sit flush

The largest shape here

The taper is on the rear panel so the front baffle stays vertical and the driver still fires forward. It turns the dead space behind a seat back into usable cabinet volume.

Needs something angled. Sealed and ported.

Standard

A plain rectangle

The smallest shape here

Front-firing, no clearance requirement and nothing to lean on. The default when the space is simply a box with room in it.

Needs nothing in particular. Sealed.

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.

Performance Optimized Questions

What does Performance Optimized mean?

It is the build standard for a cabinet cut to one driver. Net volume comes from that model published Thiele-Small parameters rather than from a size class, on a 1.5 inch double front baffle with the bracing that implies. The product page names the subwoofer each cabinet was designed around.

How is it different from a universal-cutout box?

A universal cabinet takes any driver of the right size and mounting depth and is cut to a volume range. A Performance Optimized cabinet is cut to one model, so the volume, the cutout and the alignment are set for that driver. Universal is the right answer when the driver is not decided; Performance Optimized is right when it is.

Can I put a different subwoofer in one of these?

It will usually physically mount if the cutout matches, and it will usually be the wrong volume. Two drivers of the same nominal size can want net volumes that differ by half a cubic foot. You would not damage anything, but you would give up the alignment you paid for.

Why is standard front-firing the smallest group here?

Because a cabinet cut to a specific driver is usually being cut to a specific space as well, and those spaces are more often solved by a down-fire or a wedge than by a plain box. It is not a judgement about which shape sounds better; all three are solved to the same alignment for a given driver.

Do these ship with polyfill?

The sealed cabinets do. Every sealed cabinet we build ships with polyfill already installed and the quoted volume was calculated with it in place, so you do not need to add any and you should not remove it. The ported cabinets ship dry on purpose: damping material changes the volume the port is tuned against, and the ported wedges and ported down-fires are a large part of this standard.

What if you do not list a cabinet for my driver?

Tell us the model and the space you have. We run the routers ourselves in Tullahoma, so a different net volume or a different cutout is a phone call rather than a special order.

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Last updated September 4, 2026