Proline X

MTX 5510-22 Box: Sealed 10" Wedge Enclosure

Q: Does this fit the MTX 5510-22, and will any other 10 inch fit?

The 5510-22, yes. The baffle is cut to 9.312 in for MTX's 10.312 in frame. The 5.62 inch motor clears the raked rear panel with 0.75 inch to spare. MTX's 5510-44 is the dual 4 ohm version of the same woofer, and it is a different driver with its own Qts and Vas, so it has its own enclosure rather than sharing this one.Any other 10, no. The airspace is engineered around the 5510-22's own Qts of 0.647 and Vas of 23.56 litres, 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?

MTX rates the 5510-22 at 400 watts RMS, so target 280 to 400 watts RMS at the final load.MTX sells this model as the dual 2 ohm version: 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 41.2 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 10 inch woofer puts on it at 400 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 MTX's 10.312 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 41.2 Hz, with system resonance at 50.8 Hz. At Qtc 0.940 the response carries a lift near resonance and F3 sits below fc, so the box reads full and punchy rather than extended. Our ported wedge for this same driver reaches 29.9 Hz if you want the extra depth.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 0.75 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 are not pre-installed: MTX publishes no bolt circle for the 5510-22, so set the driver in its recess, mark its holes, drill and press the inserts. The MTX 5510-22 is purchased separately, and the cabinet is cut direct fit to it, not a general purpose 10 inch box.

SKU: PO 10-S W MTX 5510-22 BB

QUICK SPECS

Best For: MTX 5510-22 Trunk-Fit Daily Driver Builds
Net Volume: 0.75 cu ft (0.82 cu ft Gross), MTX's own recommended sealed size
Driver Match: MTX 5510-22 (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.

$ 289.99

Acrylic Insert Color

In Stock and Ready to Ship

Financing available. Choose Shop Pay Installments at checkout.

MTX 5510-22 Box: Sealed 10" Wedge Enclosure

Enclosure Type Sealed

External Dimensions 20.54" W x 13" H x 12.20" D at base tapering to 7.46" D at top

Gross Volume 0.82 cu ft

Net Volume 0.75 cu ft

Shipping Weight 32 lbs

Front Panel Thickness 1.5"

INSTALLER'S TAKE

0.75 cubic feet net: Qtc 0.940, fc 50.8 Hz, F3 41.2 Hz anechoic.

Read the alignment first. MTX's Qts of 0.647 means system Q can only go up from there, so there is no sealed box that puts this driver at 0.707. This is MTX's own recommended airspace and 0.940 is what it lands on.

If the customer wants depth, point them at the ported wedge for the same driver: 1.25 cubic feet at 34.0 Hz, F3 29.9 Hz against this box's 41.2.

The 5.62 inch motor clears the raked back with 0.75 to spare.

No bolt circle is published, so the insert kit ships in the box: mark, drill and press at install. Sealed, so leave the polyfill as it is and run it at 400 watts or under.

Product Details

Performance Optimized Wedge | MTX 5510-22

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

0.75 ft3 Net0.82 ft3 GrossQtc 0.94F3 41.2 Hz20.54" x 13" x 7.46/12.20"Built in Tennessee

The MTX 5510-22 in a Sealed Wedge

The 5510-22 is the 10 inch from MTX's dual voice coil 55 Series: 35 Hz free-air resonance, Qts 0.647, 23.56 litres of Vas, rated 400 watts RMS with 15.24 mm of one-way excursion, 5.62 inches of mounting depth on a 10.31 inch frame. Every Thiele-Small figure comes from MTX's own Tech Data Sheet for this model. MTX gives each coil its own model number and measures it separately, so these are this driver's parameters rather than a family average.

This driver's Qts is 0.647. System Q can only rise as the box shrinks, so no sealed enclosure of any size puts this woofer at the 0.707 maximally flat alignment, and a box large enough to approach it would not fit a trunk. Built to MTX's own recommended airspace it lands at Qtc 0.940, which is above maximally flat: a lift near resonance and a full, punchy midbass. If you want the extra depth rather than the sealed box's smaller cabinet and gentler power demands, we build a ported wedge for this same driver that reaches 29.9 Hz.

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 MTX 5510-22

0.75 cubic feet net on MTX's published figures: the 5510-22 reads Qtc 0.940 with resonance at 50.8 Hz and half power at 41.2 Hz. That is MTX's own recommended sealed volume for this driver. Anechoic half power lands at 41.2 Hz, before any cabin gain. MTX publishes the driver displacement, 0.06 cubic feet, on the Tech Data Sheet's own Disp field, and it is taken out of the net figure. The separate Volume Displacement field on the product page is swept cone volume and is not what a box calculation subtracts.

Alignment Numbers

Driver	System Qtc	fc	F3
MTX 5510-22 D2	Qtc 0.940	50.8 Hz	41.2 Hz

Mounting Geometry

The baffle is cut to 9.312 in for MTX's 10.312 in frame. The rear panel rakes 20 degrees, so the cavity deepens from 7.46 in at the top to 12.20 in at the base, and the 5.62 in motor clears it with 0.75 in to spare. MTX publishes no bolt hole circle for any of its subwoofers, so the baffle ships undrilled with a threaded insert kit and stainless machine screws: set the driver in its recess, mark its holes, drill and press the inserts.

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.

MTX's Published Parameters

5510-22: Fs 35 Hz, Qts 0.647, Qes 0.785, Qms 3.684, Vas 23.56 L, Mms 190 g, Bl 6.726 N/A, Re 0.85 ohm. Cone area 380 cm2. Xmax 15.24 mm (one-way, basis not stated).

Wiring the MTX 5510-22 to Your Amplifier

MTX sells this model as the dual 2 ohm version: 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. MTX's 5510-44 is the dual 4 ohm version of the same woofer, and it is a different driver with its own Qts and Vas, so it has its own enclosure rather than sharing this one.

Power handling is 400 watts RMS. Aim for roughly 280 to 400 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 included (MTX publishes no bolt circle). 1 year limited warranty. Enclosure only, the driver is purchased separately. Call or text 931-563-5151.

MTX 5510-22: Cut for One Driver

0.75 cubic feet net at Qtc 0.94, F3 41.2 Hz, cut direct fit and built to order in Tennessee.

Specifications

Specification	Value
Series	Performance Optimized
Chassis	Sealed rear-firing wedge, 10 inch
Driver	MTX 5510-22, dual 2 ohm
External Dimensions	20.54" W x 13" H x 12.20" D at base tapering to 7.46" D at top
Internal Volume, Gross	0.82 cu ft
Internal Volume, Net Acoustic	0.75 cu ft after the brace and the driver displacement
Airspace Set By	MTX's own recommended sealed volume for this driver
Driver Mounting Depth	5.62 in required, 0.75 in clearance above the motor
Alignment	Qtc 0.940, fc 50.8 Hz, F3 41.2 Hz anechoic
Woofer Opening	9.312 in, cut for MTX's frame
Frame Outer Diameter	10.312 in
Bolt Circle	Not published by MTX; threaded insert kit included
Driver Displacement	0.06 cu ft, MTX spec
5510-22 Fs / Qts / Qes / Qms / Vas	35 Hz / 0.647 / 0.785 / 3.684 / 23.56 L
Driver Sd	380 cm2, MTX spec
Xmax	15.24 mm, one-way, basis not stated
Driver Power Handling	400 W RMS
Wiring Options	MTX sells this model as the dual 2 ohm version: 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	MTX Tech Data Sheet, 5510-22
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 and stainless machine screws included; inserts set at install, no bolt circle is published
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	32 lb
Warranty	1 Year Limited
Built In	Tullahoma, Tennessee

Performance Graphs

Net airspace

0.75

cu ft

System Qtc

0.94

sealed

Half power

41.2

Hz · F3

Xmax at

635

W RMS · no filter

With 25 Hz subsonic

669

W RMS · +5%

Amplifier

400

W RMS recommended

This enclosure holds 0.75 cu ft net . In it the MTX 5510-22 runs a system Qtc of 0.94 with half power at 41.2 Hz, and the cone reaches its 15.24 mm travel limit at 635 W, above the driver’s 400 W thermal rating, so heat stops you before travel does. Run a subsonic filter at 25 Hz and that becomes 669 W — +35 W, or 5 percent more power for the same 15.24 mm of travel.

01Is it a sealed driver?

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

EBP = Fs ÷ Qes = 44.6

D2 · EBP 44.6

EBP under 50 means a motor that wants a sealed load. The 5510-22 sits at 44.6, inside that band, which is why this is a sealed build rather than a ported one.

02What the box does to it

0.75 cu ft against a 23.6 L Vas.

α = Vas ÷ Vb = 1.11 · Fc = Fs√(α+1) = 51 Hz · Qtc = 0.94

D2 · Qtc 0.94, Fc 51 Hz, F3 41.2 Hz

The box lifts resonance from 35.0 Hz free-air to 51 Hz and half power lands at 41.2 Hz, anechoic, before any cabin gain. Parameters are MTX’s own Tech Data Sheet for this model. MTX gives each coil its own model number and its own measured parameters, so one curve is plotted here and it is this driver, not a family average. The cabinet is MTX’s own recommended sealed volume. This driver’s Qts of 0.647 puts a 0.707 alignment out of reach in any sealed box, so the Qtc plotted here is the one it actually lands on.

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

P_Xmax = 635 W unfiltered → 669 W with a 25 Hz subsonic

D2 · 635 W, no filterD2 · 669 W with subsonic at 25 Hz, 24 dB/octXmax 15.24 mm one-way

Every trace touches the limit and no further, because each is drawn at the exact power that puts that coil on 15.24 mm. Unfiltered that is 635 W, reached first at 34 Hz. It sits above the 400 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 669 W before hitting the same 15.24 mm. That is 5 percent more amplifier for the price of one filter setting.

Param	Value	Unit	Note
Fs	35.00	Hz	free-air resonance
Qts	0.647		D2
Vas	23.56	L	equivalent compliance
Sd	380.1	cm²	effective piston area
Xmax	15.24	mm	one-way, basis not stated
Pe	400	W	continuous RMS
SPL	82.9	dB	1 W / 1 m, derived from T/S

Driver parameters as published by MTX Tech Data Sheet. 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.