Proline X
Proline X Performance P10D-S Sealed Enclosure for Dual 10" Subwoofers
SKU: P10D-S III-G
- Best For: Dual 10" sealed installs — accurate bass, wide soundstage
- Volume: 1.5 ft³ Net (0.75 ft³ per driver)
- Tuning: N/A — Sealed
- Sonic Character: Tight, transient-accurate, flat response
Financing available — choose Shop Pay Installments at checkout.
Proline X Performance P10D-S Sealed Enclosure for Dual 10" Subwoofers
Proline X P10D-S
Dual 10" Sealed Subwoofer Enclosure | V3
Two 10" Drivers. One Sealed Enclosure. Accurate Bass Across a Wide Soundstage.
The Proline X P10D-S is a dual 10" sealed enclosure built for installs that need the output and soundstage width of two drivers without the depth requirement of a larger single-driver ported box. At 1.5 ft³ net in a shared air space with heavy internal bracing, and sealed alignment, this enclosure delivers controlled, accurate bass across a wider presentation than any single 10" can produce. Two drivers in sealed alignment produce a more even low-frequency field across the vehicle cabin, a wider perceived soundstage, and combined cone area that approaches a single 15" driver.
At 28" wide, 12.5" tall, and 10.75" deep, the P10D-S fits across most trunk floors and behind most rear seats in full-size sedans and trucks without requiring custom mounting. The 6.5" max mounting depth covers the majority of standard 10" drivers. Both drivers share a single terminal cup — both must be run at the same impedance.
Every panel is CNC-cut from Langboard Elite MDF to exact internal volume and assembled by hand in our Tennessee facility. Finish options are Dark Gray Trunkliner or Plush Black. Shipping is included.
Why Dual 10" Sealed
Two 10" drivers in sealed alignment produce a fundamentally different bass presentation than a single driver of any size. The combined cone area approaches a single 15", but the individual driver mass stays low — each 10" maintains the transient speed and articulation that the format is known for. The sealed alignment preserves that precision while the dual configuration adds output, soundstage width, and bass presence that a single 10" sealed cannot match.
The shared 1.5 ft³ air space with heavy internal bracing provides both drivers with a larger effective acoustic load than two individual 0.75 ft³ separated chambers would — the drivers interact with a combined air mass that produces a more cohesive low-frequency response across the full 28" baffle width.
Combined Cone Area
Two 10" drivers produce combined cone area approaching a single 15" while maintaining the low moving mass and transient speed that the 10" format delivers. More output than a single 10" at any power level.
Wider Bass Presentation
Two drivers spaced across a 28" baffle produce a wider, more even low-frequency field across the vehicle cabin than any single point source. Bass is more evenly distributed from driver seat to passenger seat.
Compact Depth Profile
At 10.75" deep, the P10D-S fits across most trunk floors and behind most rear seats in full-size vehicles without the depth commitment of a single 10" ported enclosure or a dual 10" ported build.
Shared Air Space — Cohesive Response
The shared 1.5 ft³ interior with heavy internal bracing provides a larger effective acoustic load per driver than separated chambers would. Both drivers work the same air mass for a more cohesive low-frequency response.
Construction: Shared Air Space, Heavy Bracing, Single Terminal Cup
The P10D-S uses the same Langboard Elite MDF and V-groove and dado joinery construction as every enclosure in the Proline X Performance Series. The interior is a single shared air space with heavy strategic bracing throughout — not two separated chambers. A single terminal cup handles both drivers internally.
Langboard Elite MDF — Named, Verified, Documented
Every panel is cut from Langboard Elite MDF — 3/4" (18mm), a named, mill-documented panel stock produced in the United States. The specifications below are pulled directly from Langboard's published mill data.
Langboard Elite — Published Mill Data
Density: 48.5 lbs/ft³ — higher density means less porosity, better screw retention, and reduced resonance
Internal Bond: 200 psi — resistance to delamination under sustained bass pressure cycling
Modulus of Elasticity: 410,000 psi — panel stiffness under load; less flex means less resonance
Face Screw Holding: 325 lbs — baffle hardware stays locked under vibration
Edge Screw Holding: 250 lbs — joint integrity at every panel edge connection
V-Groove and Dado Joinery
Every panel joint uses V-groove and dado joinery — CNC-cut interlocking grooves that mechanically lock panels before adhesive is applied. On an enclosure spanning 28" wide, panel rigidity and joint integrity are critical — the side panels span a distance that creates flex potential under bass pressure without proper joinery. Every joint on the P10D-S is mechanically locked before adhesive is applied.
Single Terminal Cup — Same Impedance Required
The P10D-S uses a single ABS/Carbon Fiber Composite recessed terminal cup built in-house at our Tennessee facility. Both drivers are wired internally to the cup with stainless steel hardware, aluminum landing plates, and copper ring terminals, pre-wired with 12g OFC speaker wire. Both drivers must be run at the same impedance — confirm your amplifier output and driver impedances match before wiring.
ShopSabre CNC Routers
Every panel is machine-cut on ShopSabre industrial CNC routers. Both driver cutouts are machined to identical diameter and position across the 28" baffle. Consistent geometry across every unit.
Hand-Assembled in Tennessee
Every enclosure is hand-assembled at our Tennessee facility and inspected before it ships. No overseas manufacturing. No batch assembly shortcuts.
Dark Gray Trunkliner or Plush Black
Both finish options are professionally applied. Dark Gray Trunkliner blends with factory trunk materials. Plush Black delivers the traditional aftermarket look. Both are durably bonded for long-term wear.
Shipping Included
No freight charges at checkout. The price you see is the price you pay. The enclosure ships assembled and ready to install.
Fitment Guide
The P10D-S spans 28" wide and sits at only 10.75" deep — a compact depth profile for a dual 10" enclosure. It fits across most trunk floors and behind most rear seats in full-size sedans and trucks without requiring custom mounting solutions.
Dimensional Specifications
External Dimensions: 28" W x 12.5" H x 10.75" D
Net Internal Volume: 1.5 ft³ — shared air space, heavily braced
Tuning Frequency: N/A — Sealed
Subwoofer Cutout: 9.25"
Max Mounting Depth: 6.5"
Front Panel Thickness: 0.75" Single Baffle
Driver Compatibility
The P10D-S accommodates any 10" subwoofer with a cutout diameter at or below 9.25" and a mounting depth at or below 6.5". Both drivers must be the same model and impedance. Verify published specifications before ordering.
Compatible Drivers
The following drivers are available from Audio Intensity and are compatible with the P10D-S:
Prodigy NB2-10D4 → Image Dynamics ID10 V4 → Prodigy NB3-10D4 → Audiomobile GT2 2010 → Prodigy NB5-10D4 → Crescendo Revolution 710 →Always verify cutout diameter and mounting depth against your specific driver's published specifications before ordering. Both drivers must be run at the same impedance.
Ideal Install Applications
Trunk Floor Build
At 28" wide and 10.75" deep, the P10D-S spans most full-size trunk floors without the depth commitment of a single ported enclosure. A compact dual 10" sealed profile that fits where ported builds cannot.
Behind Rear Seat
The 10.75" depth makes the P10D-S one of the few dual 10" enclosures viable for behind-seat installations in full-size trucks and sedans. Measure available depth before ordering.
SQ and DSP-Controlled Systems
Two sealed 10" drivers produce the wide, even bass presentation and combined output that SQ competition builds demand — with the flat sealed response that DSP-controlled systems can tune precisely.
Step Up From Single 10" Sealed
For builds running the P10-S that need more output and wider bass presentation without switching to a ported alignment — the P10D-S is the direct step up. Same driver compatibility, significantly more output.
Dual 10" Accuracy. Compact Depth. Tennessee-Built.
The Proline X P10D-S delivers dual 10" sealed performance in a 10.75" deep enclosure that fits where larger boxes cannot. Langboard Elite MDF. V-groove and dado joinery. Heavy internal bracing. In-house terminal cup. Hand-assembled in Tennessee and inspected before it ships.
Two drivers. Sealed accuracy. Combined output approaching a single 15" — in a compact trunk floor footprint. $199.99 Dark Gray Trunkliner. $209.99 Plush Black. Shipping included.
| Material | Langboard Elite MDF, 3/4" (18mm) |
| Enclosure Type | Sealed |
| Net Internal Volume | 1.5 ft³ Net — shared air space, heavily braced |
| Tuning Frequency | N/A |
| External Dimensions | 28" W x 12.5" H x 10.75" D |
| Subwoofer Cutout | 9.25" |
| Max Mounting Depth | 6.5" |
| Front Panel Thickness | 0.75" Single Baffle |
| Finish | Dark Gray Trunkliner / Plush Black (+$10) |
| Terminal Cup | ABS/Carbon Fiber Composite, recessed mount, stainless hardware, copper ring terminals — single cup, dual driver internal wiring |
| Wiring | Pre-wired 12g OFC speaker wire |
| Warranty | 1-Year Limited |
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 — 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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