Proline X

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

Q: Does it fit both the MJP1544 and the MJP1522?

Yes. Both coil versions of the MOJO Pro 15 share the 13.84 inch cutout, the 15.90 inch frame and the 7.88 inch mounting depth, and the motor clears the raked back panel by 1.33 inches at the tightest point. Buy a matched pair, same model and same coil. The alignment on this page is computed from the MJP1544's published figures; the MJP1522 column on Memphis's sheet lists a Vas its shared cone and suspension cannot produce, so we publish no Qtc for it.

Q: Why 1.21 cubic feet per driver, and what does Qtc 1.20 mean?

Memphis's 2024 MOJO Pro sheet prints 3.0 cubic feet gross for a sealed pair, and this cabinet holds 3.00: 1.50 per chamber, 1.21 net after each driver's 0.29 cubic feet of displacement. With the MJP1544's Qts of 0.650 that gives Qtc 1.202, fc 57.7 Hz and F3 42.4 Hz, a 2.4 dB peak near 71 Hz. It is a compact, punchy alignment; 2.50 cubic feet per driver would bring Qtc to 0.96 in a box twice the size.

Q: What amplifier power and impedance should I use?

Plan on 525 to 750 watts RMS per driver, 1050 to 1500 for the pair. The small chamber holds the cone back hard, so reaching the 0.51 inch Xmax would take 949 watts per driver: heat is the limit here, not travel. Two MJP1544s give 4 ohms with each driver in series and the pair in parallel, or 1 ohm with all four coils in parallel; two MJP1522s give 2 ohms or 0.5 ohm. Many amplifiers are not stable at 1 ohm, so wire MJP1544s for 4 ohms unless the amplifier is rated for 1.

Q: Why a wedge, and why does it fire rearward?

The back panel is raked 20 degrees to lie against a factory rear seat back, so the cabinet runs 15.87 inches deep at the floor and 9.32 at the top instead of standing square in the trunk. The 18 inch baffle stays vertical and both woofers fire rearward into the trunk cavity, which loads the trunk and reaches the cabin through the seat and deck.

Q: Why two chambers and two terminal cups?

A full 0.75 inch divider gives each driver its own sealed 1.50 cubic feet gross, so one cone's motion never changes the air load the other driver sees. Each chamber has a side-mounted Proline X terminal cup pre-wired with 12 gauge OFC to its own driver, so there is no cross-chamber wiring and the pair can run a monoblock per driver or share one amplifier.

Q: How low does it play, and do I need a subsonic filter?

Anechoic F3 is 42.4 Hz per driver, falling at 12 dB per octave below it, and cabin gain in most vehicles adds real output under 40 Hz. A 25 Hz subsonic filter barely changes excursion here, 949 to 956 watts at Xmax, because the small sealed box already controls the cone below 57.7 Hz. Set one to keep road rumble out of the cones.

Q: Is the driver included, and what comes in the box?

No. This is an enclosure only: the cabinet in plush black carpet, two pre-wired terminal cups, a light polyfill lining that does not change the acoustic volume, and a threaded insert kit for each driver. The threaded insert kit ships in the box for each driver position: inserts, machine screws, a screw key and the drill bit. Set the woofer in its cutout with the supplied screws so the driver locates its own pattern, lift it out, drill those holes to 13/64 inch and press the hurricane nuts in from the back of the baffle.

SKU: PO 15D-S W Mojo Pro BB

QUICK SPECS

Best For: Dual Memphis Audio MOJO Pro 15 Trunk-Fit Builds
Net Volume: 2.42 cu ft (3.00 cu ft Gross), 1.21 per driver
Driver Match: Pair of Memphis Audio MOJO Pro 15 (matched), MJP1544 or MJP1522
Construction: Dual Chamber | Rear-Firing Wedge | V-Groove/Dado | Double 1.5" Baffle | 2 Terminal Cups

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.

$ 599.99

Acrylic Insert Color

In Stock and Ready to Ship

Financing available. Choose Shop Pay Installments at checkout.

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

Enclosure Type Sealed

External Dimensions 36" W x 18" H x 15.87" D at base tapering to 9.32" D at top

Gross Volume 3.00 cu ft

Net Volume 2.42 cu ft

Weight 55 lbs

Front Panel Thickness 1.5"

INSTALLER'S TAKE

I rebuilt this cabinet to the 3.0 cubic feet gross Memphis's 2024 MOJO Pro sheet prints for a sealed pair, which leaves each driver 1.21 net in its own chamber. Qtc lands at 1.20 with F3 at 42.4 Hz anechoic and a 2.4 dB lift near 71 Hz. That is a punchy, compact alignment, and cabin gain fills in the bottom.

Heat is the limit in this box, not travel. The chamber is stiff enough that the cone would not reach its 0.51 inch Xmax until about 949 watts, so the 750 watt rating per driver is your ceiling.

Memphis publishes no bolt circle for the MOJO Pro 15, so the baffle comes undrilled with the insert kit. Set each woofer in its cutout, let its own flange mark the holes, drill 13/64 and press the hurricane nuts in from behind before the driver goes in for good.

It is 36 inches wide and 55 pounds before the woofers. Measure the trunk floor for the 15.87 inch base depth, then anchor it properly.

Product Details

Proline X | Performance Optimized Wedge

Two MOJO Pro 15s in a Dual Chamber Sealed Wedge

A sealed wedge cut for a pair of Memphis Audio MOJO Pro 15s, the MJP1544 or the MJP1522. It holds the 3.0 cubic feet gross that Memphis's 2024 MOJO Pro spec sheet prints for a sealed pair, split into two isolated chambers, with the raked back panel against the rear seat and both woofers firing rearward into the trunk.

1.21 CU FT NET PER DRIVER QTC 1.20, F3 42.4 HZ DUAL CHAMBER TRUNK MOUNT, REAR FIRING 1500W RMS COMBINED BUILT IN TULLAHOMA, TN

Read This First

Threaded Insert Kit, Baffle Ships Undrilled

Memphis Audio does not publish a bolt circle for the MOJO Pro 15, so both cutouts are machined but the mounting holes are not. The threaded insert kit ships in the box for each driver position: inserts, machine screws, a screw key and the drill bit. Set the woofer in its cutout with the supplied screws so the driver locates its own pattern, lift it out, drill those holes to 13/64 inch and press the hurricane nuts in from the back of the baffle.

Buy a matched pair. Two drivers of the same model and the same coil, both MJP1544 or both MJP1522.

The MOJO Pro 15 in a Purpose-Built Sealed Wedge

The MOJO Pro 15 puts a 2.5 inch voice coil on a 120 ounce magnet, with 0.51 inches of one-way linear travel and a 750 watt RMS rating. Memphis builds it in two coils, the MJP1544 dual 4 ohm and the MJP1522 dual 2 ohm, and both share the 13.84 inch cutout, the 15.90 inch frame and the 7.88 inch mounting depth this cabinet is cut around.

Memphis's 2024 MOJO Pro sheet prints 3.0 cubic feet gross for a sealed pair. This cabinet holds 3.00 cubic feet behind its divider, 1.50 per chamber, and after each driver's 0.29 cubic feet of displacement every MOJO Pro 15 works against 1.21 cubic feet net, 2.42 across the pair.

A Compact, High-Q Sealed Box

In 1.21 cubic feet the MJP1544's Qts of 0.650 rises to a system Qtc of 1.20, with a 2.4 dB peak near 71 Hz and F3 at 42.4 Hz. It is a tight, punchy alignment that puts its lift in the kick range and keeps the cabinet small. The same driver in 2.50 cubic feet per chamber would run Qtc 0.96 and F3 36.9 Hz, in a box twice the size.

Two Fully Separate Chambers

A full 0.75 inch divider splits the cabinet into two sealed chambers of 1.50 cubic feet gross. There is no shared airspace, so one cone's motion never changes the air load the other driver sees under hard excursion, and each driver keeps exactly the 1.21 cubic feet net the alignment below is computed at.

Each chamber has its own side-mounted Proline X terminal cup, pre-wired with 12 gauge OFC to its own driver position. There is no cross-chamber wiring inside the box, so how the pair meets the amplifier is decided at the terminals.

Trunk-Load Wedge Design Explained

Seat Side

Raked Back Panel

The back panel leans at 20 degrees to lie against a factory rear seat back, so the cabinet runs 15.87 inches deep at the floor and 9.32 at the top instead of leaving a wasted triangle.

Firing

Vertical Baffle, Rearward Output

Both woofers sit on the vertical trunk-lid-side face, an 18 inch tall 1.5 inch double baffle, and fire rearward into the trunk cavity.

The Trunk Is Part of the System

Rearward output loads the trunk volume and reaches the cabin through the rear seat and deck. That path is where a trunk-mounted pair gets its weight, and why moving the box a few inches changes what you hear.

Space

The Trunk Stays Usable

The taper gives the height back where the lid closes, and at 36 inches wide the pair leaves room beside the cabinet on most trunk floors.

Engineered for the Memphis Audio MOJO Pro 15

At 1.21 cubic feet net per driver the MOJO Pro 15 runs a system Qtc of 1.20 with resonance at 57.7 Hz. Half power lands at 42.4 Hz anechoic, before any cabin gain. Expect a tight sealed character with a 2.4 dB lift near 71 Hz, carried low in the car by cabin gain.

Alignment Numbers

Qtc 1.202, fc 57.7 Hz, F3 42.4 Hz anechoic, per driver. Computed from the MJP1544 figures Memphis publishes: Fs 31.2 Hz, Qts 0.650, Vas 2.93 cubic feet.

Mounting Geometry

Vertical 1.5 inch double baffle with a 13.84 inch cutout at each position and a flush recess for the 15.90 inch frame. At 7.88 inches of mounting depth the motor clears the raked back panel by 1.33 inches at the tightest point. The baffle ships undrilled with the threaded insert kit, because Memphis publishes no bolt circle.

Performance Series Construction, Driver-Specific Tuning

MDF

Langboard Elite 3/4 Inch

Premium 3/4 inch MDF throughout, cut on our own CNC equipment.

Joinery

V-Groove and Dado

The shell is one V-grooved strip folded at 90, 70 and 110 degrees, with the sides and the divider seated in 1/4 inch dados.

Baffle

Double-Layer 1.5 Inch Baffle

Two bonded 3/4 inch sheets carry both drivers, with a cosmetic front layer that recesses the frames flush.

Terminal

Two Pre-Wired Terminal Cups

Proline X ABS and carbon fiber composite, side mounted, one per chamber, 12 gauge OFC to each driver position.

Customize Your Build

Acrylic Insert Color. Black is standard: a black acrylic insert on the baffle. Choose None to build the cabinet without it, which takes $20 off. Plush black carpet either way.

Wiring the MOJO Pro 15 to Your Amplifier

The MJP1544 is a dual 4 ohm driver: its two coils give 8 ohms in series or 2 ohms in parallel. The MJP1522 is a dual 2 ohm: 4 ohms in series or 1 ohm in parallel.

Each chamber has its own terminal cup, so the pair can run a monoblock per driver or share one amplifier wired at the terminals. Two MJP1544s give 4 ohms with each driver in series and the pair in parallel, or 1 ohm with all four coils in parallel. Two MJP1522s give 2 ohms series-parallel, or 0.5 ohm with everything in parallel.

Watch the low loads. Many amplifiers are not stable at 1 ohm and very few at 0.5. Wire a pair of MJP1544s for 4 ohms and a pair of MJP1522s for 2 ohms unless the amplifier is rated for the lower load.

Power handling is 750 watts RMS per driver, so plan on 525 to 750 watts per driver at the final wired impedance. The small sealed chamber holds the cone back hard: it would take 949 watts to reach the 0.51 inch Xmax, past the rating, so heat is the limit in this box, not travel.

Fitment

External dimensions are 36 inches wide by 18 inches tall, with the depth running 15.87 inches at the base and tapering to 9.32 inches at the top. Installed, the raked back panel lies against the rear seat and the vertical baffle faces the trunk lid.

Measure the floor, then the lid. The 15.87 inch base depth and the 36 inch width have to clear on the trunk floor. The taper lets the lid close over the shallow end, but check your own lid line, since trunk openings vary far more than trunk floors do.

Plan the tie down. The cabinet weighs 55 pounds before the woofers go in. With two 15s fitted it is a two person lift, so anchor it properly before it goes in the vehicle rather than trusting a single strap.

Enclosure Performance

These figures are calculated from Memphis Audio's published parameters for the MJP1544: Fs 31.2 Hz, Qts 0.650, Vas 2.93 cubic feet. Volumes are net, per driver.

Volume Per Driver	Qtc	fc	F3	Character
1.21 cu ft, this enclosure	1.202	57.7 Hz	42.4 Hz	Memphis 2024 sealed pair volume. 2.4 dB rise, punchy
1.75 cu ft, larger	1.063	51.0 Hz	39.1 Hz	1.6 dB rise, a little flatter
2.50 cu ft, twice the box	0.958	46.0 Hz	36.9 Hz	1.0 dB rise, deeper, much larger cabinet

What the curves show. Doubling the airspace per driver from 1.21 to 2.50 cubic feet moves F3 5.6 Hz lower and takes the peak from 2.4 dB to 1.0 dB. On this driver a bigger box buys a flatter top end and some extension, at the cost of trunk space.

Why we built at 1.21. Memphis has published two MOJO Pro sheets. The 2022 sheet, still linked from the MJP1544 product page, prints 2.6 cubic feet gross for one driver sealed and 5.0 for a pair, and that same enclosure block appears word for word on Memphis's M7 and MOJO 15 sheets, which are different drivers. The 2024 MOJO Pro sheet revises the sealed figures to 1.5 and 3.0, and this cabinet is built to the revision.

What it sounds like in a trunk. These figures are anechoic. In a vehicle, cabin gain lifts the bottom octave regardless of alignment, and a rear-firing trunk mount adds the loading of the trunk itself, so the pair plays deeper in the car than the curve.

Run your own numbers with the Sealed Box Calculator.

Built in Tennessee, Backed by Audio Intensity

Cut and assembled to order in Tullahoma, Tennessee on our own CNC equipment. Plush black carpet, a light polyfill wall lining and a 1 year limited warranty. Full dimensions and hardware details are listed under the Enclosures tab.

Cut for the MOJO Pro 15. Built in Tennessee.

Enclosure only. The Memphis Audio MOJO Pro 15 drivers are purchased separately. Questions on 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 2, matched pair
Configuration	Dual 15 inch, dual 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	36 in
External Height	18 in
External Depth	15.87 in at the base, tapering to 9.32 in at the top
Back Panel Rake	20 degrees
Internal Volume, Gross	3.00 cu ft total, 1.50 cu ft per chamber
Internal Volume, Net Acoustic	2.42 cu ft total, 1.21 cu ft per driver after displacement
Alignment	Qtc 1.202, fc 57.7 Hz, F3 42.4 Hz anechoic, per driver (MJP1544)
Volume Basis	Memphis 2024 MOJO Pro sheet, 3.0 cu ft gross for a sealed pair
Driver Displacement	0.29 cu ft each, published by Memphis Audio
Driver Cutout	13.84 in, both positions
Driver Mounting Depth	7.88 in required, 1.33 in clearance at the tightest point
Power Handling	750 W RMS per driver; 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
Chamber Divider	Full 0.75 in divider, no shared airspace
Driver Mounting	Threaded insert kit included, baffle ships undrilled. Memphis Audio publishes no bolt circle
Terminal Cups	Two Proline X ABS and carbon fiber composite, side mounted, one per chamber, 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	55 lb empty
Warranty	1 Year Limited
Built In	Tullahoma, Tennessee

Performance Graphs

Net airspace

1.21

cu ft per chamber

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 per chamber. 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.