Proline X

Performance Optimized Wedge Sealed 15" Enclosure | Memphis Audio MOJO Pro 15

Q: Will the MJP1522 fit as well as the MJP1544?

Yes. Memphis puts both coil versions of the MOJO Pro 15 on the same 15.90 inch frame with a 13.84 inch cutout and 7.88 inches of mounting depth, and this cabinet clears that motor by 0.75 inches at its shallowest point. The Qtc and F3 on this page are worked from the MJP1544; Memphis's MJP1522 column prints a Vas its shared cone and suspension cannot have, so we do not quote an alignment for it.

Q: Why 1.21 cubic feet net?

Memphis's 2024 MOJO Pro sheet gives 1.5 cubic feet gross for one MOJO Pro 15 sealed. This cabinet holds 1.50 after the brace, and the driver itself takes 0.29, leaving 1.21 net. The MJP1544 then runs Qtc 1.202 with fc 57.7 Hz and F3 42.4 Hz anechoic, lifting 2.4 dB around 71 Hz. A 2.00 cubic foot box would bring Qtc to 1.02, in a noticeably larger cabinet.

Q: How much power, and at what impedance?

It is rated 750 watts RMS, so 525 to 750 watts at the wired load. In a box this small the cone would not reach its 0.51 inch Xmax until 949 watts, so the thermal rating is what you size the amplifier to. An MJP1544 wires to 8 ohms in series or 2 in parallel; an MJP1522 to 4 or 1. Many amplifiers are unstable at 1 ohm, so wire the MJP1522 in series for 4 ohms unless the amplifier is rated for 1.

Q: What does the wedge shape do in a trunk?

Its back panel is raked 20 degrees, the same lean as most rear seats, so it sits flat against the seat at 15.29 inches deep on the floor and 8.74 at the top. The woofer faces the trunk lid from the upright baffle and plays into the trunk, which loads that space and carries the bass into the cabin through the seat and rear deck.

Q: How deep does it play, and should I use a subsonic filter?

F3 is 42.4 Hz anechoic, rolling off at 12 dB per octave, and a car adds its own gain under about 40 Hz. A 25 Hz subsonic hardly moves the Xmax power, 949 to 956 watts, because the sealed box already stiffens the cone below 57.7 Hz. Use one to keep rumble out; it is not protecting the driver here.

Q: Why is the baffle two layers thick?

The woofer pushes on its mounting face as hard as it pushes on the air, and a 15 inch cone on a single 3/4 inch sheet makes the sheet move with it. Two bonded layers, 1.5 inches in total, hold the MOJO Pro 15 still, with a cosmetic front layer that recesses the frame flush.

Q: What comes in the box?

The finished cabinet in plush black carpet, one side-mounted terminal cup pre-wired to the driver position, a light polyfill lining sized so it does not change the 1.21 cubic foot volume, and the threaded insert kit: inserts, machine screws, a screw key and the drill bit. The MOJO Pro 15 itself is not included.

SKU: PO 15-S W Mojo Pro BB

QUICK SPECS

Best For: Memphis Audio MOJO Pro 15 Trunk-Fit Daily Driver Builds
Net Volume: 1.21 cu ft (1.50 cu ft Gross)
Driver Match: Memphis Audio MOJO Pro 15 (MJP1544 or MJP1522)
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.

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

$ 349.99

Acrylic Insert Color

In Stock and Ready to Ship

Financing available. Choose Shop Pay Installments at checkout.

Performance Optimized Wedge Sealed 15" Enclosure | Memphis Audio MOJO Pro 15

Enclosure Type Sealed

External Dimensions 20.1" W x 18" H x 15.29" D at base tapering to 8.74" D at top

Gross Volume 1.50 cu ft

Net Volume 1.21 cu ft

Weight 33 lbs

Front Panel Thickness 1.5"

INSTALLER'S TAKE

I rebuilt this one to the 1.5 cubic feet gross Memphis's 2024 MOJO Pro sheet gives a single MOJO Pro 15, which nets 1.21 once the driver is in. Qtc lands at 1.20 with F3 at 42.4 Hz anechoic. It hits hard around 71 Hz, and a car's cabin gain does the rest down low.

Size the amplifier to the 750 watt rating. The box holds the cone back so firmly that excursion is not the limit until about 949 watts.

The baffle arrives undrilled because Memphis never published the bolt circle. Let the woofer mark its own holes, drill 13/64, press the hurricane nuts in from inside and it goes down square.

Measure the trunk floor for the 15.29 inch base before you order.

Product Details

Proline X | Performance Optimized Wedge

One MOJO Pro 15 in a Compact Sealed Wedge

A rear-firing sealed wedge for a single Memphis Audio MOJO Pro 15, the MJP1544 or the MJP1522. It is built to the 1.5 cubic feet gross Memphis's 2024 MOJO Pro sheet gives one driver in a sealed box, which puts a 15 inch woofer in a cabinet just 20.1 inches wide.

1.21 CU FT NET QTC 1.20, F3 42.4 HZ REAR FIRING WEDGE 20.1 IN WIDE 750W RMS DRIVER BUILT IN TULLAHOMA, TN

Read This First

The Baffle Ships Undrilled, With the Insert Kit

There is no published bolt circle for the MOJO Pro 15, so the cutout is machined and the screw holes are left for the driver to set. The kit in the box holds the threaded inserts, machine screws, a screw key and the drill bit: drop the woofer in, run the supplied screws to mark its own hole pattern, lift it back out, drill each mark to 13/64 inch and seat the hurricane nuts from inside the cabinet.

The MOJO Pro 15 in a Purpose-Built Sealed Wedge

Memphis gives the MOJO Pro 15 a 120 ounce magnet, a 2.5 inch coil and 0.51 inches of linear travel each way, rated at 750 watts. It comes as the MJP1544 with two 4 ohm coils or the MJP1522 with two 2 ohm coils, on the same 15.90 inch frame, 13.84 inch cutout and 7.88 inch depth, so one cabinet serves both.

With the brace in, the cabinet measures 1.50 cubic feet inside, the 1.5 cubic feet gross of Memphis's 2024 sheet. The woofer's own 0.29 cubic feet comes out of that, leaving 1.21 cubic feet net.

Small Box, High Q, Real Punch

A Qts of 0.650 in 1.21 cubic feet makes a system Qtc of 1.20. The response lifts 2.4 dB around 71 Hz before rolling off, with half power at 42.4 Hz. Growing the cabinet to 2.00 cubic feet net would only take Qtc to 1.02 and F3 to 38.2 Hz, so the compact box gives up less than it looks.

Trunk-Load Wedge Design Explained

Profile

Leans Where the Seat Leans

A 20 degree back panel follows the rake of a rear seat, so the box is 15.29 inches deep on the floor and 8.74 at the top and leaves no dead wedge of air behind it.

Driver Face

Upright Baffle Toward the Lid

The woofer mounts on the upright face that looks at the trunk lid and plays rearward into the trunk, rather than into the seat back.

Acoustics

The Trunk Does the Loading

Output fills the trunk first and reaches the cabin through the seat and the rear deck, which takes the edge off localization and adds weight to the low end.

Footprint

About as Small as a 15 Gets

At 20.1 by 18 inches it is about four inches wider than the woofer's own frame, and the shallow top lets the lid close over it.

Engineered for the Memphis Audio MOJO Pro 15

In 1.21 cubic feet net the MOJO Pro 15 settles at a system Qtc of 1.20, resonance 57.7 Hz, and its half power point falls at 42.4 Hz anechoic. Expect a forward, punchy upper bass from the 2.4 dB lift, with the car's own gain carrying it below 40 Hz.

Alignment Numbers

Qtc 1.202, fc 57.7 Hz, F3 42.4 Hz anechoic. Worked from the MJP1544 column of Memphis's MOJO Pro sheet: Fs 31.2 Hz, Qts 0.650, Vas 2.93 cubic feet.

Mounting Geometry

The 1.5 inch double baffle stands vertical with a 13.84 inch cutout and a flush recess for the 15.90 inch frame. The 7.88 inch deep motor clears the raked back panel by 0.75 inches where the taper is tightest, the minimum we cut to, and a windowed C brace ties the top, back and bottom together behind it.

Performance Series Construction, Driver-Specific Tuning

Stock

Langboard Elite MDF

3/4 inch Langboard Elite for every panel, machined in house.

Shell

Folded, Not Butted

Top, back, bottom and baffle are one V-grooved strip folded at 90, 70 and 110 degrees, with both sides dropped into 1/4 inch dados.

Brace

Windowed C Brace

A 3/4 inch C brace stiffens the long panels without taking more than a few cubic inches of the airspace.

Terminal

Side Terminal Cup

One Proline X ABS and carbon fiber cup on the side, pre-wired in 12 gauge OFC to the driver position.

Customize Your Build

Acrylic Insert Color. The black acrylic baffle insert comes standard. Pick None at checkout to leave it off and save $20. The carpet is plush black on both.

Wiring the MOJO Pro 15 to Your Amplifier

MJP1544: two 4 ohm coils, 8 ohms wired in series or 2 ohms in parallel. MJP1522: two 2 ohm coils, 4 ohms in series or 1 ohm in parallel.

1 ohm is not for every amplifier. An MJP1522 in parallel presents 1 ohm, which many amplifiers will not hold. Wire it in series for 4 ohms unless the amplifier is rated 1 ohm stable.

The rating is 750 watts RMS, so 525 to 750 watts at the wired impedance is the working range. The air in a box this small stiffens the suspension so much that the cone would need 949 watts to reach its 0.51 inch Xmax. The coil's thermal rating is the ceiling here.

Fitment

Outside, the wedge is 20.1 inches wide and 18 inches tall, 15.29 inches deep at the base and 8.74 inches at the top. The upright baffle faces the trunk lid; the sloped back rests on the seat.

Check two numbers. The 15.29 inch base depth has to fit the trunk floor ahead of the seat, and the 18 inch height has to pass under the lid opening. Floors are forgiving, lid openings are not.

Weight. 33 pounds empty. Strap it to proper anchors once the driver is in; a loose 15 inch cabinet is a hazard under braking.

Enclosure Performance

Computed from Memphis Audio's published MJP1544 parameters, Fs 31.2 Hz, Qts 0.650, Vas 2.93 cubic feet, at net volume.

Volume Per Driver	Qtc	fc	F3	Character
1.00 cu ft, smaller	1.289	61.9 Hz	44.7 Hz	2.9 dB rise, peakier still
1.21 cu ft, this enclosure	1.202	57.7 Hz	42.4 Hz	Memphis 2024 single sealed volume. 2.4 dB rise
2.00 cu ft, larger	1.021	49.0 Hz	38.2 Hz	1.4 dB rise, a much bigger cabinet

Reading the chart. Between 1.00 and 2.00 cubic feet net, F3 moves 6.5 Hz and Qtc falls from 1.29 to 1.02. Box size changes how hard this driver kicks more than how deep it goes.

Why 1.21. Two Memphis sheets cover this driver. The 2022 MOJO Pro sheet, which the MJP1544 product page still links, gives 2.6 cubic feet gross for a single sealed box, but its whole enclosure block is identical to the ones on Memphis's M7 and MOJO 15 sheets, different drivers with different parameters. The 2024 MOJO Pro sheet changes the single sealed figure to 1.5 cubic feet gross, and that is the volume this cabinet holds.

In the car. Everything above is anechoic. Cabin gain and trunk loading raise the bottom octave in a real vehicle, so what you hear sits deeper than these curves.

Try other volumes in the Sealed Box Calculator.

Built in Tennessee, Backed by Audio Intensity

Machined and assembled when you order it, in Tullahoma, Tennessee. Finished in plush black carpet with a light polyfill lining and covered by a 1 year limited warranty. Hardware and dimension details are in the Enclosures tab.

Cut for the MOJO Pro 15. Built in Tennessee.

Enclosure only; the Memphis Audio MOJO Pro 15 is sold separately. For help with fitment or amplifier matching, call 931-563-5151.

Specifications

Specification	Value
Series	Proline X Performance Optimized Wedge
Compatible Driver	Memphis Audio MOJO Pro 15, MJP1544 or MJP1522, quantity 1
Configuration	Single 15 inch, single chamber sealed wedge
Mounting Position	Trunk or cargo area, raked back panel against the rear seat back
Firing Direction	Rearward into the trunk from the vertical baffle. Not a down fire design, no feet included
External Width	20.1 in
External Height	18 in
External Depth	15.29 in at the base, tapering to 8.74 in at the top
Back Panel Rake	20 degrees
Internal Volume, Gross	1.50 cu ft after the brace
Internal Volume, Net Acoustic	1.21 cu ft after driver displacement
Alignment	Qtc 1.202, fc 57.7 Hz, F3 42.4 Hz anechoic (MJP1544)
Volume Basis	Memphis 2024 MOJO Pro sheet, 1.5 cu ft gross single sealed
Driver Displacement	0.29 cu ft, published by Memphis Audio
Driver Cutout	13.84 in
Driver Mounting Depth	7.88 in required, 0.75 in clearance at the tightest point
Power Handling	750 W RMS; Xmax is not reached until 949 W in this enclosure
Impedance	MJP1544 dual 4 ohm, MJP1522 dual 2 ohm
Material	Langboard Elite MDF
Construction	CNC cut, V-groove and dado joinery
Panel Thickness	0.75 in
Front Baffle	1.5 in, double baffle
Internal Bracing	Windowed C brace
Driver Mounting	Threaded insert kit included, baffle ships undrilled. Memphis Audio publishes no bolt circle
Terminal Cups	One Proline X ABS and carbon fiber composite, side mounted, pre wired 12 gauge OFC
Damping	Light polyfill wall lining, does not alter acoustic volume
Carpet	Plush black
Acrylic Insert	Black standard, None available
Weight	33 lb empty
Warranty	1 Year Limited
Built In	Tullahoma, Tennessee

Performance Graphs

Net airspace

1.21

cu ft net

System Qtc

1.20

sealed

Half power

42.4

Hz · F3

Xmax at

949

W RMS · no filter

With 25 Hz subsonic

956

W RMS · +1%

Amplifier

525-750

W RMS recommended

This enclosure holds 1.21 cu ft net . In it the MOJO Pro 15 runs a system Qtc of 1.20 with half power at 42.4 Hz, and the cone reaches its 12.95 mm travel limit at 949 W, above the driver’s 750 W thermal rating, so heat stops you before travel does. A 25 Hz subsonic filter adds little here: 956 W against 949 W, 1 percent. The box already resonates at 58 Hz, so its own rolloff has removed most of what the filter would have stopped.

01Is it a sealed driver?

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

EBP = Fs ÷ Qes = 42.9

MJP1544 (D4) · EBP 42.9

EBP under 50 means a motor that wants a sealed load. The Memphis Audio MOJO Pro 15 sits at 42.9, inside that band, which is why this is a sealed build rather than a ported one.

02What the box does to it

1.21 cu ft against a 83.0 L Vas.

α = Vas ÷ Vb = 2.42 · Fc = Fs√(α+1) = 58 Hz · Qtc = 1.20

MJP1544 (D4) · Qtc 1.20, Fc 58 Hz, F3 42.4 Hz

The box lifts resonance from 31.2 Hz free-air to 58 Hz and half power lands at 42.4 Hz, anechoic, before any cabin gain.

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 12.95 mm, and in this alignment a subsonic filter barely moves it.

P_Xmax = 949 W unfiltered → 956 W with a 25 Hz subsonic

MJP1544 (D4) · 949 W, no filterMJP1544 (D4) · 956 W with subsonic at 25 Hz, 24 dB/octXmax 12.95 mm one-way

Every trace touches the limit and no further, because each is drawn at the exact power that puts that coil on 12.95 mm. Unfiltered that is 949 W, reached first at 47 Hz. It sits above the 750 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, and they sit almost on top of the solid ones: 956 W against 949 W. At 58 Hz the filter sits well below resonance, where the sealed alignment has already rolled the cone off at 12 dB/oct, so there is little wasted travel left for it to recover. Set it anyway to keep road rumble out of the cone, but do not size the amplifier around it.

Param	Value	Unit	Note
Fs	31.20	Hz	free-air resonance
Qts	0.650		MJP1544 (D4)
Vas	82.97	L	equivalent compliance
Sd	829.6	cm²	effective piston area
Xmax	12.954	mm	one-way linear travel, as printed
Pe	750	W	continuous RMS
SPL	87.2	dB	1 W / 1 m, derived from T/S

Driver parameters as published by Memphis Audio's MOJO Pro spec sheet (MJP1544 column). 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.