Proline X

Professional Series Ported 15" Enclosure | Memphis Audio MOJO Pro 15

Q: Why is this a Professional build and not a Performance Optimized box?

The Professional line is the full-size, front-firing option rather than a trunk wedge. This chassis is a full-size front-firing box on a 2.25 inch baffle built from three 3/4 inch layers with the woofer flush-mounted in the outer layer, a Memphis Audio logo acrylic, and a port and excursion budget checked at 900 W. It carries a 2 year warranty, against 1 year on the Performance Optimized lines.

Q: Do I need a subsonic filter?

Yes, at 26 Hz, 24 dB per octave. Below tuning a vented box stops loading the cone and excursion runs away toward DC. With the filter in place this cabinet puts the Memphis Audio MOJO Pro 15 at 64 percent of its usable travel at 900 W.

Q: Would a sealed box be better for me?

The two alignments converge at the bottom of the band on this driver rather than crossing cleanly, so there is no meaningful subsonic advantage either way. Above 25 Hz the vent is the louder of the two for the same power. The Performance Graphs tab plots this cabinet, 2.52 cubic feet vented at 32.5 Hz, against the 1.21 cu ft sealed wedge we build for this driver (PO 15-S W Mojo Pro), so you can judge it yourself.

Q: How does the front port work?

It is a vertical slot beside the woofer, the full height of the cavity, 1.75 inches wide and 28.9 square inches. It runs 7.50 inches to the back wall and turns once along it for 8.30 inches; the fold costs about 1.5 Hz and the port is cut for it. The channel runs at 20.3 metres per second at 900 W, 52 percent of its turbulence limit, and the mouth edges carry a 1/2 inch roundover so the air leaves the face at 12.2 metres per second against the 17 metres per second threshold where a slot starts to chuff.

Q: What does the price cover, and how does it ship?

62 lb, 36.00" W x 18.00" H x 13.00" D external. It ships as a UPS parcel; the price includes shipping in the 48 states. Every Professional cabinet is priced the same way, by its size: this one is 4.88 cubic feet outside. Do not add polyfill; it ships dry on purpose.

Q: Is the MOJO Pro 15 included?

No. This is an enclosure only, cut for the Memphis Audio MOJO Pro 15 specifically: the 13.840 inch cutout, the 7.880 inch mounting depth allowance and the 2.52 cubic foot alignment all come from Memphis Audio's published parameters. It fits both coil versions; the alignment published here is the D4. Bring your own driver.

SKU: Pro 15-P Mojo Pro

QUICK SPECS

Alignment: 2.52 cu ft net vented at 32.5 Hz. F3 33.4 Hz anechoic, 2.66 dB passband ripple
Driver: Memphis Audio MOJO Pro 15 D4, 750 W RMS, 13.0 mm Xmax, 31.20 Hz Fs
Build: Front-firing standard box, 2.25" three-layer baffle with the woofer flush-mounted in the outer layer, Memphis Audio logo acrylic, dado joinery, 28.9 sq in front slot port beside the woofer with one bend along the back wall, port and excursion gated at 900 W
Cabinet: 36.00" W x 18.00" H x 13.00" D, 62 lb, threaded insert kit included

Shipping Included No freight charges at checkout on US orders. International orders are quoted live carrier rates at checkout.

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.

$ 530.99

In Stock and Ready to Ship

Financing available. Choose Shop Pay Installments at checkout.

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Professional Series Ported 15" Enclosure | Memphis Audio MOJO Pro 15

$ 530.99

Enclosure Type Ported

External Dimensions 36.00" W x 18.00" H x 13.00" D

Net Volume 2.52 cu ft

Tuning Frequency 32.5 Hz

Port Area 28.9 Square Inches

Weight 62 lbs

INSTALLER'S TAKE

I built this box for one MOJO Pro 15 on the full Professional chassis: three layers of baffle with the frame flush in the outer one, and a 1.75 inch slot beside the woofer that turns once along the back wall.

Travel is the limit on this driver, not heat. The MJP1544 has 0.51 inches of it, so the tuning sits at 32.5 Hz where the vent holds the cone still, and at 900 watts it uses 8.3 of its 13.0 millimetres.

The MJP1544 is a dual 4 ohm, 8 ohms in series or 2 in parallel. The MJP1522 is a dual 2 ohm, 4 ohms or 1, and 1 ohm needs an amplifier rated for it.

Memphis Audio publishes no mounting hole locations for the MOJO Pro 15, so the inserts are not in the baffle when the box arrives. The insert kit is in the box: set the inserts where the woofer's own holes fall, with the drill bit and the 2.5 inch allen-head screws in the kit, and lay the gasket tape before the woofer goes down.

It ships dry. Do not add polyfill to a ported box. Set your subsonic filter at 26 Hz.

Product Details

Proline X Professional 15" Ported

One MOJO Pro 15 in a full-size front-firing box, vented at 32.5 Hz on a three-layer baffle

2.52 cu ft net Tuned 32.5 Hz F3 33.4 Hz 2.25" three-layer baffle Cut for the MOJO Pro 15 Built in Tennessee

2.52cu ft net

32.5Hz tuning

33.4Hz F3 anechoic

28.9sq in port area

Why this driver is vented at 32.5 Hz

The MOJO Pro 15 carries 0.51 inches of one-way linear travel, a 750 watt rating and a 7.88 inch mounting depth behind a 15.90 inch frame. This cabinet gives it 2.52 cubic feet net, vented at 32.5 Hz through a 28.9 square inch slot beside the woofer, in a box 36 inches wide, 18 tall and 13 deep with the frame flush in a 2.25 inch baffle.

Threaded insert kit ships with this box. Memphis Audio does not publish the mounting hole locations for the MOJO Pro 15, so we cannot install the threaded inserts before it ships. The threaded insert kit comes in the box instead: inserts sized to the woofer, the correct drill bit, 2.5 inch allen-head screws, an allen key and woofer gasket tape. You set the inserts when you mount the woofer, and this box ships with one kit.

Memphis publish a Qts of 0.650 for the MJP1544, and the figure holds up: their Qes and Qms reproduce it, and Fs, Vas and Sd give back the moving mass they print. An EBP of 42.9 reads sealed on paper, so the vent is placed for the car rather than for an anechoic chart. At 32.5 Hz, F3 is 33.4 Hz with 2.66 dB of passband ripple, and with cabin gain the curve holds within 0.83 dB from 25 to 60 Hz. At 900 watts, 1.2 times the rating, the cone uses 8.3 of its 13.0 millimetres and the port mouth runs 12.2 metres per second, under the 17 where a slot starts to chuff.

What makes it Professional

Three-layer baffle, flush mount

Three layers of 3/4 inch Langboard Elite make a 2.25 inch front. The outer layer is routed to the flange, so the woofer sits flush with the face; the two layers behind it carry the mounting hardware and the load.

Memphis Audio logo acrylic

A glossy black acrylic insert with the Memphis Audio mark sits in the outer layer beside the woofer. It is standard on every Professional cabinet.

Threaded insert kit ships with this box

Threaded insert kit included, inserts NOT pre-installed: the manufacturer publishes no mounting hole locations, so the kit ships with the box for installation when the woofer goes in: 8 to 12 inserts sized to the woofer, the correct drill bit, 2.5 inch allen-head screws, allen key and gasket tape.

Port gated at 900 W

The 28.9 square inch slot beside the woofer is sized so the channel runs 20.3 metres per second and the mouth 12.2 metres per second at 1.2 times the driver's rating, under the 17 metres per second where a slot starts to chuff. The channel runs 7.50 inches along its wall and turns once along the back wall for another 8.30 inches, which is why a 32.5 Hz tuning fits a 13.00 inch deep box.

Why this is a Professional build

This is the full-size, front-firing chassis for the MOJO Pro 15 rather than a trunk wedge: the frame flush in a three-layer baffle, a front slot port checked at 1.2 times the driver's rating, and room behind the motor.

What the price covers

Every Professional cabinet is priced the same way, by its size: this one is 4.88 cubic feet outside. Delivery to the 48 states is inside the price; it ships as a parcel and checkout adds nothing.

The cabinet

36.00" W x 18.00" H x 13.00" D external. Two windowed braces run front to back either side of the woofer, clearing the cutout by two and a half inches. The box ships dry: polyfill detunes a ported alignment. Inside the 36 by 18 Professional envelope for a single 15, 13 inches deep. It ships as a parcel.

Memphis's sheet lists a Vas of 2.31 cubic feet for the MJP1522 against 2.93 for the MJP1544, on the same cone and suspension, and both cannot be right. The alignment here is the MJP1544's; the cabinet fits either coil. Set the subsonic filter at 26 Hz: below tuning the vent stops loading the cone, and 0.51 inches of travel does not last long. Memphis Audio does not publish the mounting hole locations for the MOJO Pro 15, so we cannot install the threaded inserts before it ships. The threaded insert kit comes in the box instead: inserts sized to the woofer, the correct drill bit, 2.5 inch allen-head screws, an allen key and woofer gasket tape. You set the inserts when you mount the woofer, and this box ships with one kit.

The numbers to respect

Set a 26 Hz subsonic filter, 24 dB per octave. Below tuning the vent stops loading the cone; with the filter in place the cone reaches 8.3 mm of its 13.0 mm at 900 W.

Enclosure Specifications

Series	Proline X Professional
Driver-Specific Fitment	Memphis Audio MOJO Pro 15 D4 (D4)
Enclosure Type	Ported \| Front-Firing Standard Box
External Width	36.00 Inches
External Height	18.00 Inches
External Depth	13.00 Inches
Internal Volume (Gross)	3.29 Cubic Feet
Internal Volume (Net After Displacement)	2.52 Cubic Feet
Port Type	Vertical Slot Beside The Woofer \| Front Exit \| One 90 Degree Bend Along The Back Wall
Port Geometry	1.75 x 16.50 Inches, 28.9 Square Inches, 21.30 Inches Of Path
Port Area	28.9 Square Inches
Port Tuning (Fb)	32.5 Hz
Port Mouth	1/2 In Roundover On All Four Edges, 48.1 Square Inches At The Face
Port Air Velocity	20.3 m/s In The Channel, 12.2 m/s At The Mouth, At 900 W (17.0 m/s Chuff Threshold)
Design Power Basis	900 W RMS (1.2 x The Driver Rating) For Port Velocity And Excursion
Predicted F3	33.4 Hz (Anechoic)
Passband Ripple	2.66 dB (Anechoic)
Subsonic Filter	26 Hz High-Pass, 24 dB/Octave - REQUIRED On A Vented Enclosure
Driver Fs	31.20 Hz
Driver Qts	0.650
Driver Qes / Qms	0.727 / 6.558
Driver Vas	82.968 Liters / 2.930 Cubic Feet
Driver Sd	829.6 Square Centimeters
Driver Mms	305.92 g
Driver BL	12.00
Driver Re	1.8 Ohm
Driver Xmax	13mm (One-Way)
Driver Displacement	0.29 Cubic Feet (Published by Memphis Audio)
Driver Sensitivity	88.0 dB
Driver Power Handling	750 Watts RMS
Driver Overall Diameter	15.900 Inches (Memphis Audio Spec)
Mounting Depth Required	7.880 Inches (Memphis Audio Spec)
Cutout Diameter	13.840 Inches (Memphis Audio Spec)
Flush Mount Recess	16.875 Inches In The Outer Layer
Material	Langboard Elite 3/4" MDF
Construction	ShopSabre CNC / Two Windowed Braces Front To Back Either Side Of The Woofer
Joinery	Dado Joinery (CNC-Cut), Flat Panels
Front Baffle Construction	Three 3/4" MDF layers, 2.25" total \| Woofer Flush-Mounted In The Outer Layer
Baffle Layers	3
Acrylic	Glossy Black Memphis Audio Logo Insert, Outer Layer, Standard
Mounting Hardware	Threaded Insert Kit Included: 8-12 Inserts, Drill Bit, 2.5 In Allen-Head Screws, Allen Key, Gasket Tape
Voice Coil Configuration	D4
Terminal Cup	Proline X ABS/Carbon Fiber Composite \| Back Panel, Terminal-Cup Side \| 12g OFC Pre-Wired
Damping	None - Ships Dry. Polyfill Detunes A Ported Enclosure
Recommended Power	525-750 Watts RMS (Memphis Audio Rated: 750W RMS)
Carpet Finish	Plush Black
Weight	62 lb
Shipping	UPS Ground Parcel, Included In The 48 States
Bundle Options	Enclosure Only (Bring Your Own Memphis Audio MOJO Pro 15)
Warranty	2-Year Limited (Enclosure)
Manufactured	Tullahoma, Tennessee, USA

Performance Graphs

Net airspace

2.52

cu ft

Tuning

32.5

Hz · Fb

Half power

33.4

Hz · F3, anechoic

Xmax at

2184

W RMS · 26 Hz subsonic

With NO filter

327

W RMS · unfiltered

Port

12.2

m/s at the mouth · 900 W

01Is this driver right for a ported box?

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

EBP = Fs ÷ Qes = 42.9

Memphis Audio MJP1544 MOJO Pro 15 D4 · EBP 42.9

Under 50 the raw number leans sealed. The Memphis Audio MJP1544 MOJO Pro 15 D4 reads 42.9, so this is a ported build against the grain of its own EBP: it works because the alignment is tuned for in-car response rather than for an anechoic curve, and because the cabinet holds port area and volume the driver can actually use.

02What the box does to it

2.52 cu ft net against a 83.0 L Vas, vented at 32.5 Hz.

Fb = 32.5 Hz · F3 = 33.4 Hz · passband ripple 2.66 dB

Memphis Audio MJP1544 MOJO Pro 15 D4 · Fb 32.5 Hz, F3 33.4 Hz

Anechoic, before any cabin gain, with the 26 Hz subsonic filter already applied. The vent takes over below 32 Hz and the cone stops doing the work there, which is what holds travel down at the bottom of the passband.

03Perceived Ported vs Sealed

This cabinet, 2.52 cu ft net vented at 32.5 Hz, against the 1.21 cu ft sealed wedge we build for this driver (PO 15-S W Mojo Pro).

Ported Fb 32.5 Hz · the 1.21 cu ft sealed box runs Qtc 1.20, Fc 58 Hz

Ported · this cabinet, 2.52 cu ft, Fb 32.5 HzSealed wedge we build, 1.21 cu ft, Qtc 1.20

Shaded blue is where the ported alignment is louder for the same power, orange where the sealed one is. The sealed curve is the 1.21 cu ft sealed wedge we build for this driver (PO 15-S W Mojo Pro), not this cabinet with the port blocked: two different boxes, because that is the choice a buyer actually has. Across 25 to 60 Hz the vent is worth 6.5 dB at its widest and 5.2 dB on average. This is the anechoic picture, which is not what you hear in a car.

04Real World Ported vs Sealed

The same two boxes with cabin gain applied, 45 Hz corner, 18 dB ceiling.

Flatness across 25–60 Hz: ported 1.0 dB spread, the 1.21 cu ft sealed box 5.2 dB

Ported, in-car · 1.0 dB spreadSealed wedge we build, 1.21 cu ft, in-car · 5.2 dB spread

Cabin gain lifts both boxes by the same amount, so the gap between them does not change: what changes is the shape each one ends up with. A car pressurises below roughly 45 Hz, which fills in the sealed box's shallower rolloff and over-drives it where the ported box is already flat. Across 25 to 60 Hz, the band kick and bass fundamentals occupy, this alignment holds 1.0 dB of spread against 5.2 dB for the 1.21 cu ft sealed wedge we build for this driver (PO 15-S W Mojo Pro). Flatter is the whole point of tuning this high. The two alignments converge at the bottom of the band rather than crossing cleanly, so there is no meaningful subsonic advantage either way here. Cabin gain here is a house assumption, not a measurement of your vehicle.

05The 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 Memphis's published 13.0 mm. The two traces are the same cabinet with the subsonic filter switched on and switched off.

P_Xmax = 2184 W with a 26 Hz subsonic · 327 W with none → the filter is worth 6.7×

2184 W · subsonic at 26 Hz, 24 dB/oct327 W · no subsonic filterXmax 13.0 mm one-way, published

Each trace touches the limit and no further, because each is drawn at the exact power that puts the cone on 13.0 mm. With a 26 Hz subsonic that takes 2184 W, reached first at 50 Hz. Take the filter away and the same cabinet reaches 13.0 mm on 327 W — the filter is worth 6.7× the safe power. A vent unloads the cone below tuning, so there is nothing holding it once the box stops loading: on a sealed build a subsonic filter is an improvement, here it is required equipment. The unfiltered trace is still rising where this chart stops at 20 Hz, so treat 327 W as a bound rather than a floor. Every wattage on this page is a MECHANICAL limit, not an electrical one. It is the power at which the cone runs out of linear travel in this cabinet, and nothing more. What the voice coil can dissipate as heat is a separate ceiling set by the driver, not by the box — Memphis rate this one at 750 W RMS, and that is the number that binds first here: heat stops you before travel does, so treat 750 W as the ceiling and the travel figures above as headroom. Final wired impedance, amplifier output and how long you hold the level are all electrical questions this graph does not answer.

Woofer Details

Materials

Material

Built From a Spec Sheet, Not a Sales Sheet

Every Proline X Professional 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 Professional 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.