Proline X
Performance Optimized Down Fire Sealed Dual 10" Enclosure | Arc Audio SW10
SKU: PO 10D-S DF SW10
- Alignment: 0.601 cu ft gross, roughly 0.55 net per chamber, 1.10 net total, matching Arc's optimum. Qtc 0.845, Fc 53.1 Hz, F3 45.9 Hz per driver
- Chambers: Two fully separate sealed chambers, 3/4" MDF full divider, one shared side mounted terminal cup
- Drivers: Pair of Arc Audio SW10 (DVC 2Ω or 4Ω), 350W RMS each and 700W RMS combined, 2.4" mounting depth, 9.1" cutout, 676 cm² combined cone area
- Wiring: One cup feeds both positions in parallel; set impedance at the drivers and wire both identically
- Cabinet: 30"W x 15"D x 8"H measured in down fire position, square corners
Financing available. Choose Shop Pay Installments at checkout.
Performance Optimized Down Fire Sealed Dual 10" Enclosure | Arc Audio SW10
Proline X Performance Optimized Down Fire Dual 10" Sealed
Cut and tuned for a pair of Arc Audio SW10
Performance, Performance Optimized, and Micro
Proline X builds three tiers of Down Fire enclosure. The difference is not finish or materials, it is whether the cabinet was designed for a category or for a driver, and how much of the fitting work is already done for you.
| Performance | Performance Optimized | Micro Series | |
|---|---|---|---|
| Fitment | Universal. Accepts any subwoofer that clears the published cutout and mounting depth. | Woofer specific. Cut for one named subwoofer, with cutout, mounting depth, magnet clearance and displacement drawn in CAD from that driver. | Woofer specific. Cut for one named subwoofer. |
| Footprint | Sized to the driver diameter. 24.5 by 13.5 inches on the 10 inch. | Shared 30 by 15 inch platform on most builds, with cabinet height as the variable. A few drivers need a wider or deeper platform. | Compact per driver footprint. 21.5 by 14.5 inches on the 10 inch. |
| Front baffle | Single, 3/4 inch. | Double, 1.5 inch, outer layer machined as a flush recess. | Double, 1.5 inch. |
| Driver mounting | Solid flange. You drill your own mounting holes. | 8/32 threaded inserts, stainless machine screws included. | 8/32 threaded inserts, stainless machine screws included. |
| Joinery | V-groove and dado, CNC cut. | V-groove and dado, CNC cut, perimeter cross brace. | Stack fab, dowel reinforced. |
| Published alignment | Modeled Qtc profiles across a range of drivers. No single response curve. | A real predicted Qtc and F3 for that exact driver, calculated from its own Thiele-Small parameters. | Target alignment described in the listing. |
| Carpet | Gray standard, black optional. | Plush black. | Plush black. |
| Warranty | 1 year limited. | 1 year limited. | 2 years. |
Feet ship with every tier, uninstalled on purpose. Mount them where your floor wants them for a down fire install, or leave them off and run the cabinet front firing or up firing. The orientation is yours to choose.
This page is a Performance Optimized enclosure. The airspace, the cutout and the cabinet height all come from the Arc Audio SW10's own published numbers. A Performance box fits your subwoofer. A Performance Optimized box was built for it.
Built Around the Arc Audio SW10
Nothing about this cabinet is generic. Both baffles are bored to the SW10's 9.1 inch cutout, with a 10.3 inch outer diameter to clear, and the internal height is set by its 2.4 inch mounting depth, or 2.25 inches front loaded. That is the shallowest driver in the Proline X Down Fire program, which is why a dual 10 lands at 8 inches tall on a 30 by 15 inch footprint, only about three inches taller than the single driver cabinet.
Each SW10 is a dual voice coil driver offered in dual 2 ohm or dual 4 ohm, rated 350 watts RMS and 700 watts peak, for 700 watts RMS combined. Cone area is 338.16 cm² each, 676.32 cm² across the pair, which is roughly 6 dB more maximum output than a single.
Arc publishes complete Thiele-Small data for both series and parallel wiring, and the two land within a hair of each other: Fs 39.3 against 39.0 Hz, Qts 0.624 against 0.634, Vas 12.96 against 13.33 liters. One enclosure serves either wiring choice correctly. Wire both drivers identically, since mismatched wiring between chambers splits power unevenly.
Net Volume, Not Gross
Total internal gross volume is 1.202 cubic feet, split into two chambers of 0.601 cubic feet gross each, which matches Arc Audio's optimum sealed recommendation of 0.6 gross per driver almost exactly. Net internal airspace after panel thickness, bracing, the divider and the driver's own displacement is approximately 0.55 cubic feet per chamber, 1.10 cubic feet total. Arc publishes their sealed recommendations as gross rather than net, which is unusual, so both figures are listed in the specifications.
True net, not marketing net. Internal volume is calculated from the machined cavity dimensions and the driver's published displacement, not estimated from external dimensions minus wall thickness.
Per driver that volume produces Qtc 0.845 with Fc at 53.1 Hz and a predicted F3 of 45.9 Hz, the same alignment as the single driver cabinet. Identical character, twice the cone area behind it. A Qts of 0.624 is a healthy, moderate figure, so this driver reaches a properly controlled alignment rather than sitting underdamped regardless of box size. Arc's published range runs 0.4 gross minimum to 0.9 gross maximum per driver.
The tradeoff is worth stating plainly. A 39.3 Hz free air resonance and a 12.96 liter Vas are the cost of a 2.4 inch motor, so F3 sits in the mid 40s rather than the 30s. Firing down into the floor, the sealed rolloff meets rising cabin gain below 60 Hz, which is exactly where this alignment is designed to work.
Two Chambers, Full Divider
This enclosure follows the Proline X standing design rule for dual sealed builds: two fully separate chambers divided by a bonded full height 3/4 inch MDF panel, giving each driver its own dedicated airspace and its own polyfill.
Two drivers sharing one sealed volume interact acoustically. Each driver's compression phase becomes the pressure environment the other is working against, which smears transient response and blurs the alignment each would have on its own. A full height bonded divider stops that cold, and each SW10 produces its own clean sealed alignment.
Down Fire Construction
Cut with V-groove and dado joinery on our ShopSabre routers from Langboard Elite 3/4 inch MDF, a dense 48.5 lb/ft³ board with a 200 psi internal bond and 410,000 psi MOE. Every panel joint is a machined interlocking groove that mechanically locks before adhesive is applied, which keeps both chambers airtight under sustained pressure cycling. Corners are square on Down Fire cabinets.
Perimeter cross-bracing and pre-installed polyfill in each chamber complete the build. Both drivers fire down into the floor. Finished dimensions are 30 inches wide by 15 inches deep by 8 inches tall, measured in the down fire position.
Double Baffle, Flush Recess
Front baffles are 1.5 inches at both driver positions, two bonded 3/4 inch sheets, with the outer layer machined as a flush recess so each driver bolts to the inner layer. That recovers 3/4 inch of internal clearance.
Side-Mounted Terminal Cup
One shared Proline X ABS and carbon fiber composite cup with stainless hardware and copper ring terminals, pre-wired in 12 gauge OFC to both driver positions in parallel. Side mounted so it stays accessible with the baffles facing the floor.
Separate Chambers
A bonded full height 3/4 inch MDF divider splits the cabinet into two sealed volumes of 0.601 cubic feet gross each. Both drivers land on 8/32 threaded inserts, two sets of stainless machine screws included.
Power and Warranty
Arc rates each SW10 at 350 watts RMS with 700 watts peak, so combined handling is 700 watts RMS. The single side mounted cup carries one pair of posts fed to both driver positions in parallel, so you do not wire the two chambers separately at the amplifier. Final impedance is set at the drivers by how you wire each one's coils, and both drivers should be wired identically.
The enclosure carries a 1 year limited warranty. Bring your own pair of Arc Audio SW10 subwoofers; the drivers are purchased separately.
Cut for the Driver, Not the Catalog
One driver, one cutout, one volume target, done twice with a full divider between them. Every Performance Optimized cabinet is machined to a single driver's published numbers and built one at a time in Tullahoma, Tennessee.
| Series | Proline X Performance Optimized Down Fire |
| Compatible Driver | Arc Audio SW10 (Dual 2Ω or Dual 4Ω) | Pair Required |
| Enclosure Type | Sealed | Dual Driver | Down Fire Geometry | Floor-Coupled |
| Chamber Configuration | Two Fully Separate Chambers | Full Divider | Single Shared Side-Mounted Terminal Cup |
| Firing Direction | Down Firing, Both Drivers Fire Toward Floor |
| External Width | 30 Inches |
| External Depth | 15 Inches |
| External Height | 8 Inches |
| Dimension Reference | All External Dimensions Measured In Down Fire Position |
| Total Internal Gross Volume | 1.202 Cubic Feet |
| Per-Chamber Gross Volume | 0.601 Cubic Feet, Matches Arc's Optimum Sealed Spec of 0.6 Gross |
| Per-Chamber Net Volume | ~0.55 Cubic Feet |
| Total Net Volume | ~1.10 Cubic Feet |
| Arc Published Sealed Range | 0.4 Min / 0.6 Optimum / 0.9 Max Per Driver (All Gross) |
| Target System Qtc Per Chamber | 0.845 |
| Predicted Fc Per Driver | 53.1 Hz |
| Predicted F3 Per Driver | 45.9 Hz |
| Driver Fs | 39.3 Hz Series / 39.0 Hz Parallel |
| Driver Qts | 0.624 Series / 0.634 Parallel |
| Driver Vas | 12.96 Liters Series / 13.33 Liters Parallel |
| Driver Bl | 16.365 Tm Series / 8.085 Tm Parallel |
| Cone Area | 338.16 cm² Each / 676.32 cm² Total |
| Power Handling | 350 Watts RMS Each / 700 Watts RMS Combined |
| Mounting Depth Required | 2.4 Inches / 2.25 Inches Front-Load (Arc Spec) |
| Woofer Opening (Each) | 9.1 Inches (Arc Spec) |
| Standoffs | None |
| Material | Langboard Elite 3/4" MDF |
| Joinery | V-Groove and Dado (CNC-Cut) |
| Construction | ShopSabre CNC / Perimeter Cross-Brace |
| Panel Thickness | 3/4 Inch |
| Front Baffle Construction | Double-Layer 1.5" MDF at Both Driver Positions |
| Chamber Divider | 3/4" MDF Full Bonded Panel |
| Corner Profile | Square (Down Fire Series Standard) |
| Driver Mounting | 8/32 Threaded Inserts | Stainless Steel Machine Screws Included | 2 Sets |
| Voice Coil Configuration | Dual Voice Coil Per Driver, Final Impedance Set At The Drivers |
| Terminal Cup | One Proline X ABS/Carbon Fiber Composite | Side Mounted | 12g OFC Pre-Wired to Both Driver Positions |
| Internal Wiring | 12 Gauge OFC, Parallel To Both Driver Positions |
| Damping | Polyfill Pre-Installed Per Chamber |
| Carpet Finish | Plush Black |
| Bundle Options | Enclosure Only (Bring Your Own Pair of Arc Audio SW10) |
| Weight | 36 lb |
| Warranty | 1-Year Limited (Enclosure) |
| Built In | Tullahoma, Tennessee, USA |
01Is it a sealed driver?
Efficiency bandwidth product places the motor before anything else is decided.
02What the box does to it
0.55 cu ft against a 13.0 L Vas.
03The watts that reach Xmax (in this enclosure)
Travel scales with the square root of power, so there is one wattage that puts the cone exactly on 14.7 mm — and a bigger one once a subsonic filter stops it wasting travel below the passband.
| Param | Value | Unit | Note |
|---|---|---|---|
| Fs | 39.30 | Hz | free-air resonance |
| Qts | 0.624 / 0.634 | series / parallel | |
| Vas | 12.96 / 13.33 | L | equivalent compliance |
| Sd | 338.2 | cm² | effective piston area |
| Xmax | 14.7 | mm | one-way linear travel |
| Pe | 350 | W | continuous RMS |
| SPL | 82.2 | dB | 1 W / 1 m, derived from T/S |
Driver parameters as published by arcaudio.com SW10 published specification table. Curves computed against this enclosure’s actual net airspace.
Built From a Spec Sheet, Not a Sales Sheet
Every Proline X Performance Series enclosure is CNC-cut from Langboard Elite MDF, 3/4" (18mm) panels produced to published mill specifications. Most enclosure manufacturers source generic MDF without published data. We can tell you the internal bond rating, the modulus of elasticity, the modulus of rupture, and the face and edge screw holding strength for every panel in this enclosure, because we chose the material based on those numbers, not on price or availability.
Langboard Elite is produced in the United States. The specifications below are pulled directly from Langboard's published mill data and are verifiable. This is the same panel stock used in our full Proline X lineup.
Langboard Elite MDF: Published Mill Data
| Property | Value | Why It Matters |
|---|---|---|
| Panel Stock | Langboard Elite MDF | Named, verifiable panel source, not generic "high-density MDF" |
| Thickness | 3/4" (18mm) | Industry standard for subwoofer enclosures; panels below this flex under pressure |
| Density | 48.5 lbs/ft³ | Higher density = less porosity, better screw retention, reduced resonance |
| Internal Bond | 200 psi | Measures resistance to delamination under sustained internal pressure. The most enclosure-relevant spec on this sheet |
| Modulus of Rupture (MOR) | 4,200 psi | Bending strength before the panel breaks, relevant for larger unsupported baffle spans |
| Modulus of Elasticity (MOE) | 410,000 psi | Stiffness under load; higher MOE means less panel flex under bass pressure, less resonance |
| Face Screw Holding | 325 lbs | How firmly the panel surface holds a screw; critical for baffle joint integrity over time |
| Edge Screw Holding | 250 lbs | Panel edge retention, relevant for every joint that isn't face-to-face |
200 psi: The Number That Actually Matters for Enclosures
The internal bond rating measures how well the MDF panel resists delamination under sustained pressure applied perpendicular to the face. In a subwoofer enclosure, every bass transient generates a pressure pulse that pushes outward on every panel simultaneously. A panel that begins to delaminate internally loses stiffness gradually. The symptoms are slow: a box that starts to sound softer, less defined, less punchy over months of use. 200 psi internal bond is the spec that determines how long this enclosure holds its acoustic integrity under daily use at real power levels.
410,000 psi MOE: Less Flex, Less Resonance
The modulus of elasticity measures panel stiffness, its resistance to bending under load. A stiffer panel flexes less under the pressure generated by a high-excursion driver at volume. Panel flex is a source of acoustic coloration: the panel itself begins to radiate sound at its own resonant frequency, adding distortion to the output. 410,000 psi stiffness combined with V-groove and dado joinery means the panels stay rigid and the bracing controls resonance at the structure level, not the panel level. The bass you hear comes from the driver, not the box.
325 lb Face / 250 lb Edge: Joints That Stay Locked
Screw holding strength determines how firmly the panel grips a fastener at the face and at the edge. This matters most at the baffle joint, where the front panel meets the side panels and where the driver is mounted. A panel with low screw holding strength allows fasteners to loosen over time under vibration, leading to air gaps at the joint and loss of acoustic seal. 325 lb face screw holding strength means the baffle hardware stays put. Combined with dado joinery and adhesive, the front panel on a Proline X Performance Series enclosure is not going anywhere.
Named Panel Stock: Not "Premium MDF"
The phrase "premium MDF" or "high-density MDF" appears on marketing copy for enclosures across every price point, from $40 to $400. It is not a specification. It is a description with no defined standard. Langboard Elite is a named, sourced, mill-documented product with published data. We name it in our copy because naming it holds us accountable to the spec. You can look up Langboard Elite independently, verify the numbers on this page, and confirm you are getting what we say you are getting. That is the point.
Why Proline X?
Most enclosures are built to a price point. Proline X is built to a spec. Every box starts with published-data MDF, gets CNC-cut to exact internal volume, and is assembled by hand in our Tennessee facility. The difference shows up in the measurements, and in how the box holds up two years into daily use.
CNC-Cut to Spec
Panels are machine-cut on ShopSabre CNC routers and joined with V-groove and dado joinery. Consistent geometry, no hand-cut variance, no gaps at the joints.
Handcrafted in USA
Hand-assembled at our facility in Tullahoma, TN. Every enclosure is inspected before it ships.
Tuned to the Build
Internal volume and port geometry are calculated to spec and CNC-cut to exact dimensions. The box performs the same way every time.
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