Proline X PO 12-S W MG12 sealed wedge, front baffle with gloss black insert and pre-wired leads, 24.5 by 15 inches.

Proline X

Musway MG12 Box: Sealed 12" Wedge Enclosure

Q: Does this fit the Musway MG12, and will any other 12 inch fit?

The MG12, yes, in the dual 2 ohm version. The baffle is cut to 11.22 in, Musway's published cutout, under the 12.76 in frame. The 7.13 inch motor clears the cabinet with 0.75 inch to spare.Any other 12, no. The airspace is engineered around the MG12'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?

Musway rates the MG12 at 700 watts RMS, so target 489 to 700 watts RMS at the final load.Musway sells the MG12 as dual 2 ohm: the dual 2 ohm is two 2 ohm coils, 4 ohms in series or 1 ohm in parallel. A parallel load at or under 1 ohm needs an amplifier rated for it. 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 driver fires 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 53.3 Hz on this page.

Q: Why is the front baffle double-layered?

The baffle is two bonded 3/4 inch sheets, 1.5 inches through. A single 3/4 inch panel flexes under the pressure a 12 inch woofer puts on it at 700 watts, which smears output and works the driver loose over time; the second layer stiffens the face and gives the mounting hardware twice the material to bite.The outer layer is machined as a flush recess to Musway's 12.76 inch frame, so the driver bolts to the inner layer and sits flush with the gloss black acrylic insert.

Q: What is the expected low-frequency extension?

Anechoic F3 is 53.3 Hz. 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 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 1.30 cubic feet 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, the polyfill lining already in place, and a threaded insert kit with stainless machine screws.The inserts ship loose on purpose: Musway prints no bolt circle for the MG12, so you set the driver in the recess, mark its holes, drill and press the inserts. The Musway MG12 is purchased separately, and the cabinet is cut direct fit to it, not a general purpose 12 inch box.

SKU: PO 12-S W MG12 BB

QUICK SPECS

Best For: Musway MG12 Trunk-Fit Builds
Net Volume: 1.30 cu ft (1.43 cu ft Gross)
Driver Match: Musway MG12 (dual 2 ohm)
Construction: Rear-Firing Wedge | V-Groove/Dado | Double 1.5" Baffle | Threaded 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.

Tools icon: hands-on mobile audio expertise since 1985

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.

Musway MG12 Box: Sealed 12" Wedge Enclosure

More enclosures cut for Musway subwoofers: Musway Subwoofer Boxes

Enclosure Type Sealed

External Dimensions 24.54" W x 15" H x 14.03" D at base tapering to 8.57" D at top

Gross Volume 1.43 cu ft

Net Volume 1.30 cu ft

Shipping Weight 42 lbs

Front Panel Thickness 1.5"

INSTALLER'S TAKE

1.30 cubic feet: Qtc 0.660 on the dual 2 ohm, F3 53.3 Hz.

The 7.13 inch motor clears the raked back with 0.75 to spare; the airspace sets the rest of the cabinet.

Musway's MG12 table disagrees with itself: the printed 87.5 L Vas does not match the 174 g moving mass, so I built on the 63.4 L that the mass implies. Displacement is estimated.

Inserts ship in the kit, not pressed: Musway prints no bolt circle. Mark from the driver, drill, press. Sealed, so leave the polyfill as it is and run it at 700 watts or under per driver.

Product Details

Performance Optimized Wedge | Musway MG12

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

1.30 ft3 Net1.43 ft3 GrossQtc 0.66Single Chamber Wedge24.54" x 15" x 8.57/14.03"Built in Tennessee

The Musway MG12 in a Sealed Wedge

The MG12 is Musway's 12 inch in the MG line, dual 2 ohm, rated 700 watts RMS with 22 mm of one-way excursion, 7.13 inches of mounting depth on a 12.76 inch frame. Every Thiele-Small figure comes from Musway's own published table for the MG12, with one exception. Musway prints a Vas of 87.5 litres, but its own moving mass (174 grams), resonance and cone area put Vas at 63.4 litres, and that consistent figure is used here; on the printed 87.5 the same cabinet would read Qtc 0.74.

1.30 cubic feet net on Musway's published figures: the dual 2 ohm reads Qtc 0.660 with resonance at 49.5 Hz and half power at 53.3 Hz. The volume is 1.3 cubic feet, a little above Musway's 35 litre (1.24 cubic foot) recommended sealed maximum for the MG12. That is a slightly over-damped alignment: a gentle, early rolloff and tight transients rather than a flat top.

Trunk-Load Wedge Design Explained

The driver mounts on the vertical trunk-lid-side face and fires 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 the Musway MG12

Anechoic half power lands at 53.3 Hz, before any cabin gain. Musway does not publish driver displacement, so an estimated 0.117 cubic feet per driver is taken out of the net figure.

Alignment Numbers

Driver	System Qtc	fc	F3
MG12 dual 2 ohm	Qtc 0.660	49.5 Hz	53.3 Hz

Mounting Geometry

The baffle is cut to 11.22 in, Musway's published cutout, under the 12.76 in frame. The rear panel rakes 20 degrees, so the cavity deepens from 8.57 in at the top to 14.03 in at the base, and the 7.13 in motor clears it with 0.75 in to spare. Musway prints no bolt circle for the MG12, 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 brace 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.

Musway's Published Parameters

dual 2 ohm: Fs 30 Hz, Qts 0.4, Qes 0.46, Qms 3.28, Vas 63.4 L (Mms-consistent; printed 87.5), Mms 174 g, Re 2 x 1.8 ohm. Cone area 531 cm2. Xmax 22 mm.

Wiring the Musway MG12 to Your Amplifier

Musway sells the MG12 as dual 2 ohm: the dual 2 ohm is two 2 ohm coils, 4 ohms in series or 1 ohm in parallel. A parallel load at or under 1 ohm needs an amplifier rated for it. Confirm the final load against your amplifier's minimum stable impedance before powering the system.

Power handling is 700 watts RMS per driver. Aim for roughly 489 to 700 watts 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 pre-wired terminal cup, 12 gauge OFC to the driver position. Polyfill wall lining installed. Threaded insert kit and stainless machine screws in the box. 1 year limited warranty. Enclosure only, the driver is purchased separately. Call or text 931-563-5151.

Musway MG12: Cut for One Driver

1.30 cubic feet net at Qtc 0.66, F3 53.3 Hz, cut direct fit and built to order in Tennessee.

Specifications

Specification	Value
Series	Proline X Performance Optimized Wedge
Compatible Driver	Musway MG12 (dual 2 ohm), quantity 1. Direct fit
Configuration	Single 12 inch, single chamber 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	24.54 in
External Height	15 in at the seat face
External Depth	14.03 in at the base, tapering to 8.57 in at the top
Internal Volume, Gross	1.43 cu ft
Internal Volume, Net Acoustic	1.30 cu ft after the brace and the driver displacement
Driver Mounting Depth	7.13 in required; 0.75 in clearance above the motor against the raked rear panel
Alignment, dual 2 ohm	Qtc 0.660, fc 49.5 Hz, F3 53.3 Hz anechoic
Woofer Opening	11.22 in, Musway's published cutout
Frame Outer Diameter	12.76 in
Bolt Circle	Not printed by Musway; threaded insert kit included
Driver Displacement	0.117 cu ft, estimated; Musway publishes none
dual 2 ohm Fs / Qts / Qes / Qms / Vas	30 Hz / 0.4 / 0.46 / 3.28 / 63.4 L
Driver Sd	531 cm2, Musway spec
Xmax	22 mm one way, Musway spec
Driver Power Handling	700 W RMS
Wiring Options	Musway sells the MG12 as dual 2 ohm: the dual 2 ohm is two 2 ohm coils, 4 ohms in series or 1 ohm in parallel. A parallel load at or under 1 ohm needs an amplifier rated for it.
Parameter Source	Musway MG8 / MG10 / MG12 owner's manual specifications table; Vas taken as 63.4 L from Musway's own moving mass, printed 87.5 L
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	Windowed brace, dadoed to the shell
Driver Mounting	Threaded insert kit included, NOT pre-installed: Musway prints no bolt circle
Terminal Cups	One Proline X ABS and carbon fiber composite, side mounted, pre wired 12 gauge OFC
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	42 lb
Warranty	1 Year Limited
Built In	Tullahoma, Tennessee

Performance Graphs

Net airspace

1.30

cu ft

System Qtc

0.66

sealed

Half power

53.3

Hz · F3

Xmax at

1062

W RMS · no filter

With 25 Hz subsonic

1456

W RMS · +37%

Amplifier

700

W RMS recommended

This enclosure holds 1.30 cu ft net . In it the Musway MG12 runs a system Qtc of 0.66 with half power at 53.3 Hz, and the cone reaches its 22.0 mm travel limit at 1062 W, above the driver’s 700 W thermal rating, so heat stops you before travel does. Run a subsonic filter at 25 Hz and that becomes 1456 W — +394 W, or 37 percent more power for the same 22.0 mm of travel.

01Is it a sealed driver?

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

EBP = Fs ÷ Qes = 65.2

D2 · EBP 65.2

At 65.2 the MG12 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

1.30 cu ft against a 63.4 L Vas.

α = Vas ÷ Vb = 1.72 · Fc = Fs√(α+1) = 49 Hz · Qtc = 0.66

D2 · Qtc 0.66, Fc 49 Hz, F3 53.3 Hz

The box lifts resonance from 30.0 Hz free-air to 49 Hz and half power lands at 53.3 Hz, anechoic, before any cabin gain. Parameters are Musway’s own published table for the MG12 (dual 2 ohm). Musway prints Vas 87.5 L, which disagrees with its own 174 g moving mass; the 63.4 L that mass implies is plotted. Driver displacement is not published and is estimated.

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

P_Xmax = 1062 W unfiltered → 1456 W with a 25 Hz subsonic

D2 · 1062 W, no filterD2 · 1456 W with subsonic at 25 Hz, 24 dB/octXmax 22.0 mm one-way

Every trace touches the limit and no further, because each is drawn at the exact power that puts that coil on 22.0 mm. Unfiltered that is 1062 W, reached first at 20 Hz. It sits above the 700 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 1456 W before hitting the same 22.0 mm. That is 37 percent more amplifier for the price of one filter setting.

Param	Value	Unit	Note
Fs	30.00	Hz	free-air resonance
Qts	0.400		D2
Vas	63.40	L	equivalent compliance
Sd	531.0	cm²	effective piston area
Xmax	22	mm	one-way maximum, as Musway publish it
Pe	700	W	continuous RMS
SPL	87.6	dB	1 W / 1 m, derived from T/S

Driver parameters as published by Musway 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.