Proline X PO 12D-S W AA275 sealed wedge, front baffle with gloss black insert and pre-wired leads, 28.9 by 16 inches.

Proline X

Performance Optimized Wedge Sealed Dual 12" Enclosure | Ampere Audio AA-2.75 12

Q: Does this fit the Ampere Audio AA-2.75 12, and will any other 12 inch fit?

The AA-2.75 12, yes, in both coil versions. The baffle is cut to 11.01 in, Ampere's published cutout, under the 12.83 in frame. The 7.50 inch motor clears the cabinet with 0.75 inch to spare. Run two of the same coil so the chambers match.Any other 12, no. The airspace is engineered around the AA-2.75 12's own Qts and Vas, and a different woofer that happened to drop into the hole would not see the alignment printed on this page.

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

Ampere rates the AA-2.75 12 at 1000 watts RMS per driver, so target 700 to 1000 watts RMS per driver at the final load.Ampere sells the AA-2.75 12 as dual 2 ohm and dual 4 ohm; a matched pair should share a coil. A pair of dual 2 ohm drivers lands on 2 ohms with each woofer's coils in series and the two woofers in parallel, or 8 ohms all in series. A pair of dual 4 ohm drivers lands on 4 ohms with each woofer's coils in series and the woofers in parallel, or 1 ohm with everything in parallel. Anything under 1 ohm, and many amplifiers at 1 ohm, is outside what the amplifier is built for, so series wiring is the safe default. Confirm your amplifier's minimum stable impedance first.

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 adds real output below 50 Hz, so in-vehicle response runs deeper than the anechoic 60.5 Hz on the dual 2 ohm and 53.8 Hz on the dual 4 ohm 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 blurs the alignment either would have alone. A bonded full-height 3/4 inch divider gives each driver its own 0.82 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 60.5 Hz on the dual 2 ohm and 53.8 Hz on the dual 4 ohm per chamber. Below Qtc 0.707 the rolloff is gentle and F3 sits above fc, which is what an over-damped sealed box does.Those figures exclude cabin gain. In a car the cabin's transfer function adds real output below 50 Hz, so in-vehicle response runs deeper than the numbers above.

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 0.82 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 a threaded insert kit with stainless machine screws.The inserts ship loose on purpose: Ampere prints no bolt circle for the AA-2.75 12, so you set the driver in the recess, mark its holes, drill and press the inserts. The pair of Ampere Audio AA-2.75 12 is purchased separately, and the cabinet is cut direct fit to it, not a general purpose 12 inch box.

SKU: PO 12D-S W AA275 BB

QUICK SPECS

Best For: Dual Ampere Audio AA-2.75 12 Trunk-Fit Builds
Net Volume: 0.82 cu ft per chamber (1.92 cu ft Gross Total)
Driver Match: Pair of Ampere Audio AA-2.75 12 (dual 2 ohm and dual 4 ohm), matched
Construction: Dual Chamber | Rear-Firing Wedge | V-Groove/Dado | Double 1.5" Baffle | 1 Shared Terminal Cup | Insert Kit

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.

$ 369.99

Acrylic Insert Color

In Stock and Ready to Ship

Financing available. Choose Shop Pay Installments at checkout.

Performance Optimized Wedge Sealed Dual 12" Enclosure | Ampere Audio AA-2.75 12

Enclosure Type Sealed

External Dimensions 28.91" W x 16" H x 14.57" D at base tapering to 8.75" D at top

Gross Volume 1.92 cu ft

Net Volume 1.64 cu ft

Shipping Weight 48 lbs

Front Panel Thickness 1.5"

INSTALLER'S TAKE

0.82 cubic feet per chamber: Qtc 0.665 on the dual 2 ohm and Qtc 0.659 on the dual 4 ohm, F3 60.5 Hz on the dual 2 ohm and 53.8 Hz on the dual 4 ohm.

The 7.50 inch motor clears the raked back with 0.75 to spare; the motor, not the airspace, sets the depth.

Ampere's table needed reading carefully: the printed cone area is the nominal circle in square inches and the compliance unit is off by a thousand, so cone area is derived from their own Vas and compliance. Displacement is Ampere's own figure.

Inserts ship in the kit, not pressed: Ampere prints no bolt circle. Mark from the driver, drill, press. Sealed, so leave the polyfill as it is and run it at 1000 watts or under per driver.

Product Details

Performance Optimized Wedge | Dual Ampere Audio AA-2.75 12

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

0.82 ft3 Net per Chamber1.92 ft3 GrossQtc 0.66 to 0.67Two Separate Chambers28.91" x 16" x 8.75/14.57"Built in Tennessee

A Pair of Ampere Audio AA-2.75 12 in a Sealed Wedge

The AA-2.75 12 is Ampere's 12 inch in the AA-2.75 series: built on a cast aluminum frame with a 2.75 inch aluminum voice coil, a vented gap and a large aluminum Faraday ring, rated 1000 watts RMS with 19 mm of one-way excursion, 7.50 inches of mounting depth on a 12.83 inch frame. Every Thiele-Small figure comes from Ampere's own published table for the AA-2.75 12, and the table holds together: the moving mass and resonance reproduce the published Vas on a cone area in class for a 12 inch driver. Two cells in Ampere's table are mislabeled: the cone area printed is the nominal circle in square inches, not the effective area, and the compliance is printed in mm/N where the value is micrometers per newton. The cone area used here, 532 square centimeters, is derived from Ampere's own Vas and compliance.

0.82 cubic feet net per chamber on Ampere's published figures: the dual 2 ohm reads Qtc 0.665 with resonance at 56.8 Hz and half power at 60.5 Hz, and the dual 4 ohm reads Qtc 0.659 with resonance at 49.9 Hz and half power at 53.8 Hz. One cabinet serves both coils, built to the volume that keeps both closest to maximally flat. That is a slightly over-damped alignment: a gentle, early rolloff and tight transients rather than a flat top.

Two Fully Separate Chambers

A bonded full-height 3/4 inch MDF divider splits the cabinet into two sealed chambers of 0.82 cubic feet net each, so every driver sees exactly the airspace printed on this page. Two drivers sharing one volume load each other; the divider removes that, and each chamber carries its own polyfill.

The cabinet is 28.91 inches wide, 16 tall, 8.75 inches deep at the top and 14.57 at the base; the width is set by two 12.83 inch frames side by side. 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 Woofers

Vertical baffle, cones 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 Ampere Audio AA-2.75 12

Anechoic half power lands at 60.5 Hz on the dual 2 ohm and 53.8 Hz on the dual 4 ohm, before any cabin gain. Ampere publishes the driver displacement, 0.11 cubic feet, and it is taken out of the net figure for each driver.

Alignment Numbers (Per Chamber)

Driver (per chamber)	System Qtc	fc	F3
AA-2.75 12 dual 2 ohm	Qtc 0.665	56.8 Hz	60.5 Hz
AA-2.75 12 dual 4 ohm	Qtc 0.659	49.9 Hz	53.8 Hz

Mounting Geometry

The baffle is cut to 11.01 in, Ampere's published cutout, under the 12.83 in frame. The rear panel rakes 20 degrees, so the cavity deepens from 8.75 in at the top to 14.57 in at the base, and the 7.50 in motor clears it with 0.75 in to spare. Ampere prints no bolt circle for the AA-2.75 12, 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.

Ampere's Published Parameters

dual 2 ohm: Fs 38.9 Hz, Qts 0.456, Qes 0.507, Qms 4.513, Vas 26.29 L, Mms 256.6 g, Bl 21.99 N/A, Re 3.91 ohm. dual 4 ohm: Fs 33.6 Hz, Qts 0.444, Qes 0.5, Qms 4.018, Vas 28.06 L, Mms 321.8 g, Bl 29.39 N/A, Re 6.35 ohm. Cone area 532 cm2 (derived). Xmax 19 mm.

Wiring a pair of Ampere Audio AA-2.75 12 to Your Amplifier

Ampere sells the AA-2.75 12 as dual 2 ohm and dual 4 ohm; a matched pair should share a coil. A pair of dual 2 ohm drivers lands on 2 ohms with each woofer's coils in series and the two woofers in parallel, or 8 ohms all in series. A pair of dual 4 ohm drivers lands on 4 ohms with each woofer's coils in series and the woofers in parallel, or 1 ohm with everything in parallel. Anything under 1 ohm, and many amplifiers at 1 ohm, is outside what the amplifier is built for, so series wiring is the safe default. Confirm the final load against your amplifier's minimum stable impedance before powering the system.

Power handling is 1000 watts RMS per driver, 2000 across the pair. 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 Ampere Audio AA-2.75 12: Cut for One Driver

0.82 cubic feet net per chamber at Qtc 0.66 to 0.67, F3 60.5 Hz on the dual 2 ohm and 53.8 Hz on the dual 4 ohm, cut direct fit and built to order in Tennessee.

Specifications

Specification	Value
Series	Proline X Performance Optimized Wedge
Compatible Driver	Ampere Audio AA-2.75 12 (dual 2 ohm and dual 4 ohm), 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	28.91 in
External Height	16 in at the seat face
External Depth	14.57 in at the base, tapering to 8.75 in at the top
Internal Volume, Gross	1.92 cu ft total
Internal Volume, Net Acoustic	0.82 cu ft per chamber after the divider and the driver displacement
Driver Mounting Depth	7.50 in required; 0.75 in clearance above the motor against the raked rear panel
Alignment, dual 2 ohm per chamber	Qtc 0.665, fc 56.8 Hz, F3 60.5 Hz anechoic
Alignment, dual 4 ohm per chamber	Qtc 0.659, fc 49.9 Hz, F3 53.8 Hz anechoic
Woofer Opening	11.01 in, two, Ampere's published cutout
Frame Outer Diameter	12.83 in
Bolt Circle	Not printed by Ampere; threaded insert kit included
Driver Displacement	0.11 cu ft, Ampere spec
dual 2 ohm Fs / Qts / Qes / Qms / Vas	38.9 Hz / 0.456 / 0.507 / 4.513 / 26.29 L
dual 4 ohm Fs / Qts / Qes / Qms / Vas	33.6 Hz / 0.444 / 0.5 / 4.018 / 28.06 L
Driver Sd	532 cm2, derived from Ampere's Vas and compliance
Xmax	19 mm one way, Ampere spec
Driver Power Handling	1000 W RMS per driver
Wiring Options	Ampere sells the AA-2.75 12 as dual 2 ohm and dual 4 ohm; a matched pair should share a coil. A pair of dual 2 ohm drivers lands on 2 ohms with each woofer's coils in series and the two woofers in parallel, or 8 ohms all in series. A pair of dual 4 ohm drivers lands on 4 ohms with each woofer's coils in series and the woofers in parallel, or 1 ohm with everything in parallel. Anything under 1 ohm, and many amplifiers at 1 ohm, is outside what the amplifier is built for, so series wiring is the safe default.
Parameter Source	Ampere Audio published T/S and dimension tables, AA-2.75 series page
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: Ampere prints no bolt circle
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 in both chambers, does not alter acoustic volume
Carpet	Plush black
Shipping Weight	48 lb
Warranty	1 Year Limited
Built In	Tullahoma, Tennessee

Performance Graphs

Net airspace

0.82

cu ft per chamber

System Qtc

0.66–0.67

sealed

Half power

53.8–60.5

Hz · F3

Xmax at

1437

W RMS · no filter

With 25 Hz subsonic

1962

W RMS · +37%

Amplifier

1000

W RMS recommended

This enclosure holds 0.82 cu ft net per chamber. In it the Ampere Audio AA-2.75 12 runs a system Qtc of 0.66–0.67 with half power at 53.8–60.5 Hz, and the cone reaches its 19.0 mm travel limit at 1437 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 1962 W — +525 W, or 37 percent more power for the same 19.0 mm of travel.

01Is it a sealed driver?

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

EBP = Fs ÷ Qes = 67.2–76.7

D2 · EBP 76.7D4 · EBP 67.2

At 67.2–76.7 the AA-2.75 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

0.82 cu ft against a 26.3 L Vas.

α = Vas ÷ Vb = 1.13 · Fc = Fs√(α+1) = 50–57 Hz · Qtc = 0.66–0.67

D2 · Qtc 0.67, Fc 57 Hz, F3 60.5 HzD4 · Qtc 0.66, Fc 50 Hz, F3 53.8 Hz

The box lifts resonance from 33.6–38.9 Hz free-air to 50–57 Hz and half power lands at 53.8–60.5 Hz, anechoic, before any cabin gain. Ampere prints this driver’s cone area as the nominal circle in square inches; the area used here is derived from Ampere’s own Vas and compliance.

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

P_Xmax = 1437–1637 W unfiltered → 1962–2072 W with a 25 Hz subsonic

D2 · 1637 W, no filterD4 · 1437 W, no filterD2 · 2072 W with subsonic at 25 Hz, 24 dB/octD4 · 1962 W with subsonic at 25 Hz, 24 dB/octXmax 19.0 mm one-way

Every trace touches the limit and no further, because each is drawn at the exact power that puts that coil on 19.0 mm. Unfiltered that is 1437 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 1962 W before hitting the same 19.0 mm. That is 37 percent more amplifier for the price of one filter setting.

Param	Value	Unit	Note
Fs	38.90 / 33.60	Hz	free-air resonance
Qts	0.456 / 0.444		D2 / D4
Vas	26.29 / 28.06	L	equivalent compliance
Sd	532.5	cm²	effective piston area
Xmax	19	mm	one-way, as Ampere publish it
Pe	1000	W	continuous RMS
SPL	86.7	dB	1 W / 1 m, derived from T/S

Driver parameters as published by Ampere Audio published T/S table. Curves computed against this enclosure’s actual net airspace.

Customer Installs

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.