Proline X Micro Series Dual 10" Sealed Enclosure | Built for Arc Audio SW10

1.2 cu ft Common Chamber: Two SW10s, One Shared Airspace

Arc Audio publishes a 0.60 cubic foot sealed optimum for the SW10. The M10D-S ARC SW10 is a common-chamber design: both SW10 subwoofers share a single 1.2 cubic foot internal airspace with no dividing wall between them. Two drivers sharing 1.2 cubic feet of airspace load acoustically equivalent to a single SW10 in 0.60 cubic feet of airspace. The ratio of cone displacement to airspace stays the same, and Arc Audio's 0.60 cubic foot per-driver target is met precisely.

Common-chamber dual designs are the correct engineering approach when both drivers are receiving the same signal and moving in phase. Physically dividing the enclosure into two isolated 0.60 cubic foot chambers would produce identical acoustic behavior at higher construction complexity and lower structural rigidity across the enclosure as a whole. The common chamber is simpler, stronger, and acoustically equivalent. Structural bracing is integrated into the panel layering rather than requiring a full dividing wall.

"If I Do the Math on the External Dimensions, the Volume Looks Too Big"

This is the most common question we get on every Micro Series enclosure. The math customers run looks like this: external dimensions of 34" × 14.5" × 7.5" subtract 3/4" walls on all six sides, leaving an assumed internal cavity of 32.5" × 13" × 6". That works out to 2,535 cubic inches, or roughly 1.47 cubic feet. The listed net volume is 1.2 cubic feet, a difference of about 0.27 cu ft, which looks like the enclosure must be oversized by about 22%.

That math assumes four things that are not true on a Proline X stack-fab enclosure:

1. The walls are not 3/4" on every side. The front baffle is a double-layer stack-fab build at 1.5 inches thick, twice the assumed wall thickness. That alone removes more internal depth than a 3/4" calculation accounts for.

2. The enclosure is not a perfect rectangle. Viewed from above, all four corners are radiused at 3 inches. This is a deliberate design choice for two reasons: the rounded corners break up the parallel-wall geometry that creates internal standing waves, and they produce a finished shape that fits cleanly against vehicle interior surfaces without sharp corners catching on trim or upholstery. The 3" radii remove measurable internal volume that an external-minus-walls calculation assumes is open airspace.

3. The area directly behind each driver's magnet is precision-milled. This is a deliberate engineering step that serves two purposes. First, it allows us to make fine volume adjustments to hit the target airspace exactly. Second, and more importantly, it increases the open area immediately behind each driver's rear vent. The SW10's pole vent is part of the driver's voice coil cooling system. Air flows through the vent during cone movement, carrying heat away from the voice coil former. If the area immediately behind the vent is restricted, backpressure builds against that airflow and voice coil cooling is compromised. Most enclosure manufacturers do not understand this airflow dynamic, and even fewer engineer around it. We do.

4. The drivers themselves displace internal airspace once installed. Each SW10's basket, motor, and pole structure occupies meaningful volume inside the chamber. Two SW10s displace twice as much as one. This is not subtracted from a back-of-napkin external calculation, but it is subtracted from what the drivers acoustically load into.

How we actually calculate volume. Our engineering approach is built on precision, and it is different from how most enclosure manufacturers calculate airspace and different from the math any customer can do from external dimensions. A Proline X stack-fab enclosure is built from individually CNC-cut layers, each with its own machined opening. We calculate the precise internal volume of every layer's opening, then sum those layer-by-layer volumes to arrive at the actual net airspace inside the assembled enclosure. No one else in this industry calculates net volume this way. It is the only method that produces a genuinely accurate account of the airspace the drivers see once the enclosure is built. The 1.2 cubic foot figure is exact, not approximate.

The SW10 in a 0.60 cu ft Per-Driver Sealed Alignment: What It Sounds Like

The Arc Audio SW10 is Arc's SW Series shallow SQ subwoofer, engineered for sound quality applications where enclosure depth is limited. It uses a front-mounted N42UH neodymium motor with a CNC-machined vented iron motor cap, a raised-cup reinforced cellulose fiber cone with hydrophobic coating, a low-shore butyl rubber surround, a Nomex/cotton spider, a stage-baked tempered aluminum voice coil, and 14.7mm of one-way linear excursion. The 2.4-inch mounting depth is the SW Series shallow-mount signature: a real SQ driver that fits where other SQ drivers cannot.

Two SW10s in this common-chamber enclosure produce roughly 3 dB more low-frequency output than a single SW10 at equivalent power, and combined thermal capacity is 700 watts RMS. The dual configuration is the correct choice when a single SW10 is not enough output for the cabin size, or when the wider footprint distributes bass energy across a broader listening zone (particularly effective in trucks where the enclosure spans the full cab floor width behind the seats).

1.5" Double-Layer Baffle. Common Chamber. Integrated Bracing.

The front baffle is a double-layer stack-fab build: two CNC-cut Langboard Elite MDF panels bonded to 1.5 inches total. Both SW10 mounting positions are cut from the same continuous baffle for consistent alignment. The stack-fab assembly is reinforced with dowels throughout, adding between-layer tension reinforcement that locks the panel stack against shear movement.

The common-chamber approach on this dual build integrates structural bracing directly into the panel layering rather than requiring a full dividing wall between drivers. The CNC-cut layer geometry provides internal rigidity at the correct locations to resist panel flex under combined driver loading, without segmenting the acoustic volume. The result is a stronger enclosure at lower material weight, with acoustic conditions that match Arc Audio's per-driver optimum for both SW10s simultaneously.

Where It Fits

At 34" × 14.5" × 7.5", the M10D-S ARC SW10 is designed for wide-format installations where a single 10" is not enough output and depth is the constraint:

• Behind-seat floor: full-size crew cab and extended cab trucks
• Cargo floor: full-size SUVs and vans
• Trunk floor: full-size sedans with wide trunk openings
• Downfire on truck cab floor: maximum floor coupling
• Custom cargo builds: any vehicle with 34"+ floor width at 7.5" clearance
• SQ-focused dual 10 builds where depth is the design constraint

Made in Tennessee

Every Proline X Micro Series enclosure is CNC-cut and hand-assembled in Tullahoma, Tennessee on ShopSabre CNC routers. Internal volume, cutout geometry, layer-by-layer opening dimensions, baffle layer count, dowel placement, and terminal positioning are all held to spec on every unit. Langboard Elite MDF throughout: named, mill-documented, published density and bond specifications.