Proline X PO 12D-S W ENCORE sealed wedge, front baffle with gloss black insert and pre-wired leads, 32 by 16 inches.

Proline X

Performance Optimized Wedge Sealed Dual 12" Enclosure | Audiomobile Encore 4412

Q: Does this fit the Audiomobile Encore 4412, and will any other 12 inch fit?

The Encore 4412, yes: the baffle is cut to Audiomobile's 11.00 inch cutout, the recess to its 12.65 inch frame, and the raked rear panel clears the 4.9 inch motor with 3.07 inch to spare. The Encore ships in one version, dual 4 ohm, so there is no coil variant to choose. Run two of them so the chambers match.Any other 12, no. The airspace is engineered around the Encore 4412's 0.518 Qts and 30.12 liters of Vas, and a different woofer that happened to drop into the hole would not see the alignment printed on this page.

Q: Why 0.90 cubic feet per chamber, and what alignment does it target?

0.90 cubic feet sits inside Audiomobile's 0.7 to 1.25 cubic feet sealed range and above the 0.8 cubic foot minimum on its sheet. Computed from Audiomobile's published Fs 32.0 Hz, Qts 0.518 and Vas 30.12 liters it gives system Qtc 0.765, resonance 47.3 Hz and an anechoic half-power point of 44.0 Hz.The maximally flat Butterworth box for this driver would be 1.23 cubic feet. This cabinet is built a little smaller on purpose: Qtc 0.77 adds at most 0.1 dB of punch around resonance without giving up extension, and keeps the wedge to a trunk-friendly 32.00 inches wide.

Q: What amplifier power should I run, and how should I wire it?

Audiomobile rates the Encore 4412 at 1000 watts RMS per driver and 2000 watts maximum, so target 700 to 1000 watts RMS per driver at the final impedance. Each driver carries two 4 ohm coils: parallel for 2 ohms (1.68 ohms DC, the way Audiomobile measured it), series for 8 ohms.Wire both drivers identically so the chambers share power evenly. Both drivers in parallel and the pair paralleled is 1 ohm, which needs an amplifier rated for it; either mixed arrangement, parallel within and series across or series within and parallel across, gives 4 ohms and is the safe answer on any amplifier.

Q: Why the wedge angle, and why rear-firing into the trunk?

The seat-side face carries a 20 degree rake that matches the lean of a factory rear seat back, so the cabinet sits flush against it and the cargo space in front stays usable. The baffle is the vertical trunk-lid-side face, so the drivers fire rearward into the trunk cavity.The trunk acts as an acoustic extension for the sealed box, and the cabin's transfer function adds real output below 50 Hz, so in-vehicle response runs deeper than the anechoic 44.0 Hz on this page.

Q: Why two separate chambers instead of one shared volume?

Two drivers sharing one sealed volume load each other: each driver's compression stroke becomes the pressure the other works against, which smears transients and blurs the alignment either would have alone. A bonded full-height 3/4 inch divider gives each driver its own 0.90 cubic feet and its own polyfill.It also means a failure in one driver does not unload the other, and the alignment on this page is the alignment in each chamber, not an average across a shared box.

Q: What is the expected low-frequency extension?

Anechoic F3 is 44.0 Hz per chamber with system resonance at 47.3 Hz. At Qtc 0.77 the response carries a slight 0.1 dB lift near resonance and F3 sits just below fc, the classic punchy sealed alignment.Those figures exclude cabin gain. In a car the transfer function of the cabin adds real output below 50 Hz, so in-vehicle response runs deeper than the numbers above. Audiomobile's sheet publishes no in-box F3 for this driver.

Q: Do I need to add polyfill or damping?

No. Polyfill is already installed in both chambers as a light wall lining to control internal reflections, and the quantity is chosen so it does not change the acoustic volume.Do not add more. Packing a sealed box with fill makes it behave as though it were larger, which walks the alignment away from the 0.90 cubic feet per chamber this cabinet was built to.

Q: Is the driver included, and are the threaded inserts installed?

No driver. This is an enclosure only. You receive the cabinet finished in plush black carpet with the gloss black acrylic baffle insert, one side-mounted pre-wired terminal cup to both positions, the polyfill lining already in place, and the threaded insert kit with stainless machine screws.The inserts ship loose on purpose: Audiomobile publishes no mounting hole locations for the Encore, so you set the driver in the recess, mark its holes, drill and press the inserts. The pair of Audiomobile Encore 4412 is purchased separately, and the cabinet is cut direct fit to it, not a general purpose 12 inch box.

SKU: PO 12D-S W ENCORE BB

QUICK SPECS

Best For: Dual Audiomobile Encore 4412 Trunk-Fit Builds
Net Volume: 0.90 cu ft per chamber (2.07 cu ft Gross Total)
Alignment: Qtc 0.765, fc 47.3 Hz, F3 44.0 Hz
Driver Match: Pair of Audiomobile Encore 4412 (dual 4 ohm), matched
Construction: Dual Chamber | Rear-Firing Wedge | V-Groove/Dado | Double 1.5" Baffle | Threaded Insert Kit included

Shipping Included No freight charges at checkout. What you see is what you pay.

Built in Tennessee CNC cut from 3/4" Langboard Elite MDF. V-groove and dado joinery.

Advanced Terminal Cup Built in-house. ABS/Carbon Fiber. Stainless steel hardware. Copper ring terminals.

$ 389.99

Acrylic Insert Color

In Stock and Ready to Ship

Financing available. Choose Shop Pay Installments at checkout.

Performance Optimized Wedge Sealed Dual 12" Enclosure | Audiomobile Encore 4412

Enclosure Type Sealed

External Dimensions 32.00" W x 16" H x 14.28" D at base tapering to 8.46" D at top

Gross Volume 2.07 cu ft

Net Volume 1.80 total / 0.90 per chamber cu ft

Shipping Weight 53 lbs

Front Panel Thickness 1.5"

INSTALLER'S TAKE

Built a little under the Encore 4412's 1.23 cubic foot Butterworth volume on purpose, 0.90 cubic feet per chamber for Qtc 0.77. It reads punchy rather than flat by about a decibel and keeps the wedge narrow.

Inserts ship in the kit, not pressed: Audiomobile publishes no hole pattern for the Encore. Mark from the driver, drill, press. If we get the hole locations later this changes to pre-installed.

Two chambers at 0.90 each, 32.00 inches wide, 16 tall, 14.28 at the base. Wire the pair identically; all four coils in parallel is 1 ohm, the mixed arrangements give 4.

Audiomobile's Klippel sheet and the dealer spec tables disagree on this driver. The sheet reproduces its own moving mass from its compliance and is what this cabinet is built to; say so if a customer brings the other numbers.

Polyfill is already in as a wall lining. Adding more makes the box act larger and walks the alignment off the volume it was built to.

Product Details

Performance Optimized Wedge | Dual Audiomobile Encore 4412

Dual 12" Sealed Wedge Enclosure | Rear-Firing Trunk-Load Design

0.90 ft3 Net per Chamber2.07 ft3 GrossQtc 0.77Two Separate Chambers32.00" x 16" x 8.46/14.28"Built in Tennessee

A Pair of Audiomobile Encore 4412 in a Sealed Wedge

The Encore 4412 is Audiomobile's low-profile 12 inch subwoofer: 4.9 inches of mounting depth on a cast aluminum frame, a 3 inch dual 4 ohm voice coil, 1000 watts RMS and 2000 watts maximum, 19.1 mm of one-way excursion at 70 percent Bl, a composite sandwich cone with a carbon fiber dust cap. Every figure comes from Audiomobile's own Encore Series specification sheet, the Klippel data measured with the two 4 ohm coils in parallel, which reproduces its own moving mass and compliance. Dealer tables print a second, different parameter set for this driver; it is not used here.

0.90 cubic feet net per chamber is inside Audiomobile's 0.7 to 1.25 cubic feet sealed range for the Audiomobile Encore 4412 and above the 0.8 cubic foot (22 liter) minimum printed on its sheet. It is a little under the 1.23 cubic foot Butterworth box, so the Encore 4412 lands at Qtc 0.765 with system resonance at 47.3 Hz and half power at 44.0 Hz: a touch of punch above maximally flat, 0.1 dB at most, without giving up extension.

Two Fully Separate Chambers

A bonded full-height 3/4 inch MDF divider splits the cabinet into two sealed chambers of 0.90 cubic feet net each, so every driver sees exactly the airspace it would have in the single wedge. Two drivers sharing one volume load each other; the divider removes that, and each chamber carries its own polyfill.

The cabinet solved at 32.00 inches wide, pinned at the 32 inch cap for a dual and with the depth absorbing the airspace, 16 inches tall, 8.46 inches deep at the top and 14.28 at the base. One shared side-mounted terminal cup feeds both driver positions.

Trunk-Load Wedge Design Explained

The drivers mount on the vertical trunk-lid-side face and fire rearward into the trunk cavity.

Seat-Side Face Matches Seat Lean

Angled face matches the roughly 20 degree factory seat lean.

Trunk-Lid-Side Face Fires the Woofer

Vertical baffle, cone firing rearward into the trunk cavity.

Trunk Cavity Loading

The trunk acts as an acoustic extension for a smoother presentation.

Preserves Trunk Cargo Space

The wedge tucks against the seat back and the space in front stays usable.

Engineered for a pair of Audiomobile Encore 4412

Half power lands at 44.0 Hz anechoic, before any cabin gain. Audiomobile publishes the cone area outright, 498.76 square centimeters, and the excursion, 19.1 mm each way. The driver displacement, 0.11 cubic feet, is not on Audiomobile's sheet and is an estimate; it only affects the gross figure, the net airspace is what the cabinet was cut to.

Alignment Numbers (Per Chamber)

Driver (per chamber)	System Qtc	fc	F3
Encore 4412, dual 4 ohm coils in parallel	Qtc 0.765	47.3 Hz	44.0 Hz

Mounting Geometry

Vertical baffle CNC cut to 11.00 in (280 mm) at each position, the cutout Audiomobile prints. The rear panel rakes 20 degrees, so the cavity deepens from 8.46 in at the top to 14.28 in at the base, and the 4.9 in motor clears it with 3.07 in to spare above its top edge, well past the 0.75 in this line requires. The cosmetic recess is cut to Audiomobile's published 12.65 in frame. Audiomobile publishes no mounting hole locations for the Encore, so the baffle ships undrilled with a threaded insert kit and stainless machine screws: set the driver in the recess, mark its holes, drill, press the inserts and bolt it down.

What the Numbers Rest On

Langboard Elite MDF

Premium 3/4 in MDF throughout.

V-Groove and Dado Joinery

CNC cut V-grooves at every panel intersection, sides and divider seated in dados.

Double-Layer 1.5" Front Baffle

Two bonded 3/4 in MDF sheets at the driver face, the outer layer machined as a flush recess.

Audiomobile's Own Sheet

Fs 32.0 Hz, Qts 0.518, Qes 0.538, Qms 13.424, Vas 30.12 L, Sd 498.76 cm2, Mms 289.48 g, Cms 0.086 mm/N, Bl 13.5 T-m, coils in parallel. Reference efficiency 0.176 percent, about 84.5 dB at 1 W derived from it.

Wiring a pair of Audiomobile Encore 4412 to Your Amplifier

The Encore 4412 carries two 4 ohm voice coils: wire them in parallel for a nominal 2 ohm load (1.68 ohm DC, the configuration Audiomobile measured) or in series for 8 ohms. Wire both drivers identically. Two drivers with their coils in parallel, then paralleled together, present 1 ohm and need an amplifier rated for it; each driver in parallel and the pair in series, or each in series and the pair in parallel, gives 4 ohms, the safe load on any amplifier. Confirm the final load against your amplifier's minimum stable impedance before powering the system.

Power handling is 1000 watts RMS per driver. Aim for roughly 700 to 1000 watts per driver at the impedance you wire.

Built in Tennessee, Backed by Audio Intensity

Cut and assembled in Tullahoma, Tennessee on our own CNC equipment. Finished in plush black carpet with the gloss black acrylic baffle insert, one shared pre-wired terminal cup, 12 gauge OFC to both driver positions. Polyfill wall lining installed. Threaded insert kit and stainless machine screws in the box. 1 year limited warranty. Enclosure only, the drivers are purchased separately. Call or text 931-563-5151.

Dual Audiomobile Encore 4412: Built to 0.90 Cubic Feet per Chamber

Qtc 0.765, F3 44.0 Hz, cut direct fit to the Encore 4412 and built to order in Tennessee.

Specifications

Specification	Value
Series	Proline X Performance Optimized Wedge
Compatible Driver	Audiomobile Encore 4412, quantity 2. Direct fit
Configuration	Dual 12 inch, two separate chambers, sealed wedge
Mounting Position	Trunk or cargo area, tall face against the rear seat back
Firing Direction	Rearward into the trunk. Not a down fire design, no feet included
External Width	32.00 in, the dual width cap
External Height	16 in at the seat face
External Depth	14.28 in at the base, tapering to 8.46 in at the top
Internal Volume, Gross	2.07 cu ft total
Internal Volume, Net Acoustic	0.90 cu ft per chamber after the divider and an estimated 0.11 cu ft driver displacement per driver
Driver Mounting Depth	4.9 in required; 3.07 in clearance above the motor against the raked rear panel
Audiomobile Sealed Range	0.7 to 1.25 cubic feet; sheet minimum 0.8 cu ft (22 L)
Alignment per chamber	Qtc 0.765, fc 47.3 Hz, F3 44.0 Hz anechoic
Butterworth Volume	1.23 cu ft; this cabinet is built smaller on purpose
Woofer Opening	11.00 in (280 mm) direct fit, two
Frame Outer Diameter	12.65 in (321 mm), Audiomobile spec
Bolt Circle	Not published by Audiomobile; see Driver Mounting
Driver Displacement	0.11 cu ft, estimated; not on Audiomobile's sheet
Fs / Qts / Qes / Qms	32.0 Hz / 0.518 / 0.538 / 13.424, coils in parallel
Vas / Mms / Cms / Bl	30.12 L / 289.48 g / 0.086 mm/N / 13.5 T-m
Driver Sd	498.76 cm2, published by Audiomobile
Xmax	19.1 mm one way at 70 percent Bl; 46 mm peak to peak mechanical
DC Resistance	1.68 ohm with the 4 ohm coils in parallel
Driver Sensitivity	Reference efficiency 0.176 percent, Audiomobile spec; about 84.5 dB at 1 W derived from it
Driver Power Handling	1000 W RMS / 2000 W maximum per driver
Wiring Options	Dual 4 ohm coils: 2 ohm in parallel, 8 ohm in series; two drivers give 1 ohm or 4 ohm, see the wiring section
Voice Coil	3 in (76 mm) dual 4 ohm, Le 0.979 mH at 1 kHz
Parameter Source	Audiomobile Encore Series specification sheet (Klippel data); dealer tables print a second set that is not used
Material	Langboard Elite MDF
Construction	CNC cut, V-groove and dado joinery
Panel Thickness	0.75 in
Front Baffle	1.5 in double baffle, outer layer machined as a flush recess
Internal Bracing	Full-height 3/4 in divider
Driver Mounting	Threaded insert kit included, NOT pre-installed: Audiomobile publish no mounting hole locations
Terminal Cups	One Proline X ABS and carbon fiber composite, side mounted, pre wired 12 gauge OFC to both driver positions
Acrylic Insert	Gloss black acrylic baffle insert standard; None variant minus $20
Damping	Light polyfill wall lining, does not alter acoustic volume
Carpet	Plush black
Shipping Weight	53 lb
Warranty	1 Year Limited
Built In	Tullahoma, Tennessee

Performance Graphs

Net airspace

0.90

cu ft per chamber

System Qtc

0.77

sealed

Half power

44.0

Hz · F3

Xmax at

1086

W RMS · no filter

With 25 Hz subsonic

1343

W RMS · +24%

Amplifier

1000

W RMS recommended

This enclosure holds 0.90 cu ft net per chamber. In it the Audiomobile Encore 4412 runs a system Qtc of 0.77 with half power at 44.0 Hz, and the cone reaches its 19.1 mm travel limit at 1086 W, above the driver’s 1000 W thermal rating, so heat stops you before travel does. Run a subsonic filter at 25 Hz and that becomes 1343 W — +257 W, or 24 percent more power for the same 19.1 mm of travel.

01Is it a sealed driver?

Efficiency bandwidth product places the motor before anything else is decided.

EBP = Fs ÷ Qes = 59.5

4412, dual 4 ohm coils in parallel · EBP 59.5

At 59.5 the Encore 12 sits in the transition band, not the sealed band. That is not a mismatch: a transition motor works in either alignment, and sealed buys a smaller box and a gentler roll-off at the cost of some low-end output. Stage 02 shows what this airspace actually does with it.

02What the box does to it

0.90 cu ft against a 30.1 L Vas.

α = Vas ÷ Vb = 1.18 · Fc = Fs√(α+1) = 47 Hz · Qtc = 0.77

4412, dual 4 ohm coils in parallel · Qtc 0.77, Fc 47 Hz, F3 44.0 Hz

The box lifts resonance from 32.0 Hz free-air to 47 Hz and half power lands at 44.0 Hz, anechoic, before any cabin gain. Figures are from Audiomobile’s own Encore Series sheet, measured with the two 4 ohm coils in parallel. 0.90 cubic feet is a little under the 1.23 cubic foot Butterworth box, so the 4412 sits at Qtc 0.77: a touch of punch above maximally flat, inside Audiomobile’s own sealed range and above the 0.8 cubic foot minimum on its sheet. Each chamber of this dual holds 0.90 cubic feet, so per driver it is the single wedge twice over.

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 19.1 mm — and a bigger one once a subsonic filter stops it wasting travel below the passband.

P_Xmax = 1086 W unfiltered → 1343 W with a 25 Hz subsonic

4412, dual 4 ohm coils in parallel · 1086 W, no filter4412, dual 4 ohm coils in parallel · 1343 W with subsonic at 25 Hz, 24 dB/octXmax 19.1 mm one-way

Every trace touches the limit and no further, because each is drawn at the exact power that puts that coil on 19.1 mm. Unfiltered that is 1086 W, reached first at 20 Hz. It sits above the 1000 W the driver can take thermally, so the voice coil gives up before the suspension does. The dashed traces are the same driver behind a subsonic filter at 25 Hz, 24 dB/oct: stopping the cone wasting travel below the passband lets it take 1343 W before hitting the same 19.1 mm. That is 24 percent more amplifier for the price of one filter setting.

Param	Value	Unit	Note
Fs	32.00	Hz	free-air resonance
Qts	0.518		4412, dual 4 ohm coils in parallel
Vas	30.12	L	equivalent compliance
Sd	498.8	cm²	effective piston area
Xmax	19.1	mm	one-way at 70 percent Bl, Audiomobile's own basis
Pe	1000	W	continuous RMS
SPL	84.5	dB	1 W / 1 m, derived from T/S

Driver parameters as published by Audiomobile Encore Series specification sheet (Klippel data). Curves computed against this enclosure’s actual net airspace.

Materials

Material

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.

Specifications

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

Internal Bond

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.

Stiffness

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.

Screw Holding

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.

Sourcing

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.