Proline X

Professional Series Ported 15" Enclosure | NVX VCW15v3

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 NVX VCW15v3 at 51 percent of its usable travel at 1800 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, 2.83 cubic feet vented at 32.5 Hz, against the 2.00 cu ft sealed wedge we build for this driver (PO 15-S W VCW), 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, 2.25 inches wide and 37.1 square inches. It runs 8.00 inches to the back wall and turns once along it for 10.47 inches; the fold costs about 1.5 Hz and the port is cut for it. The channel runs at 21.9 metres per second at 1800 W, 49 percent of its turbulence limit, and the mouth edges carry a 1/2 inch roundover so the air leaves the face at 14.3 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?

64 lb, 36.00" W x 18.00" H x 14.00" D external. Every Professional cabinet is priced the same way, by its size: this one is 5.25 cubic feet outside. Delivery to the 48 states is inside the price; it ships as a 64 lb parcel and checkout adds nothing. The Performance Optimized 15 inch ported wedge is $499.99. The $55 difference is the larger box and the port this driver needs to run at its rating. Do not add polyfill; it ships dry on purpose.

Q: Is the VCW15v3 included?

No. This is an enclosure only, cut for the NVX VCW15v3 specifically: the 14.125 inch cutout, the 8.190 inch mounting depth allowance and the 2.83 cubic foot alignment all come from NVX's published parameters. It fits both coil versions (D2 and D4), and the cabinet was checked against both. Bring your own driver.

SKU: Pro 15-P VCW

QUICK SPECS

Alignment: 2.83 cu ft net vented at 32.5 Hz. F3 33.1 Hz anechoic, 2.41 dB passband ripple
Driver: NVX VCW15v3 D2/D4, 1500 W RMS, 23.0 mm Xmax, 29.30 Hz Fs
Build: Front-firing standard box, 2.25" three-layer baffle with the woofer flush-mounted in the outer layer, NVX logo acrylic, dado joinery, 37.1 sq in front slot port beside the woofer with one bend along the back wall, port and excursion gated at 1800 W
Cabinet: 36.00" W x 18.00" H x 14.00" D, 64 lb, threaded inserts pressed into the baffle on the published 14.780 inch bolt circle

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.

$ 554.99

In Stock and Ready to Ship

Financing available. Choose Shop Pay Installments at checkout.

Complete Your System

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Wavtech Wavtech Link1500.1plus Amplifier - Compact 1500W Monoblock $ 699.99

Professional Series Ported 15" Enclosure | NVX VCW15v3

$ 554.99

More enclosures cut for NVX subwoofers: NVX Subwoofer Boxes

Enclosure Type Ported

External Dimensions 36.00" W x 18.00" H x 14.00" D

Gross Volume 3.62 cu ft

Net Volume 2.83 cu ft

Tuning Frequency 32.5 Hz

Port Area 37.1 Square Inches

Shipping Weight 72 lbs

INSTALLER'S TAKE

I built this box for one VCW15v3 on the full Professional chassis: three layers of baffle with the frame flush in the outer one, and a slot port that runs along the back wall to put 32.5 Hz in a 14.0 inch deep box.

One cabinet serves both coils. It was solved so the VCW152v3 (D2) and the VCW154v3 (D4) each pass every velocity, excursion and ripple gate in the same box.

NVX publishes the bolt circle, so the threaded inserts are pressed at the shop and the screws are in the box.

1500 watts RMS by NVX's rating. The D2 wires to 4 ohms in series or 1 ohm in parallel; the D4 to 8 ohms series or 2 ohms parallel. 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 VCW15v3 in a front-firing box, vented at 32.5 Hz on a three-layer flush-mount baffle

2.83 cu ft net Tuned 32.5 Hz F3 33.1 Hz 2.25" three-layer baffle Cut for the VCW15v3 Built in Tennessee

2.83cu ft net

32.5Hz tuning

33.1Hz F3 anechoic

37.1sq in port area

Why this driver is vented at 32.5 Hz

The VCW15v3 is NVX's 15 inch at 29.3 Hz, a Qts of 0.58, 104.7 litres of Vas and 1500 W RMS. This cabinet gives it 2.83 cubic feet net behind a 2.25 inch three-layer baffle, vented at 32.5 Hz through a 37.1 square inch slot beside the woofer, for an anechoic F3 of 33.1 Hz in a 36 by 18 by 14.0 inch front-firing box.

Sealed, the VCW15v3 needs 7.61 cubic feet net to reach a Qtc of 0.707. Vented, it trades that for deeper extension. The slot is gated at 1800 W, 1.2 times NVX's rating: the channel runs 21.9 m/s and the mouth 14.3, and the cone peaks at 11.6 of its 23 mm with the subsonic filter in place.

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.

NVX logo acrylic

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

Mounting

Threaded inserts pressed into the baffle on the published 14.780 inch bolt circle, stainless machine screws included.

Port gated at 1800 W

The 37.1 square inch slot beside the woofer is sized so the channel runs 21.9 metres per second and the mouth 14.3 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 8.00 inches along its wall and turns once along the back wall for another 10.47 inches, which is why a 32.5 Hz tuning fits a 14.00 inch deep box.

Why this is a Professional build

The VCW15v3 also builds in the Performance Optimized ported wedge, the smaller and cheaper box. The Professional cabinet is the step up for it: a 2.25 inch three-layer baffle with the woofer flush in the outer layer, and a slot port gated at 1800 W.

What the price covers

Every Professional cabinet is priced the same way, by its size: this one is 5.25 cubic feet outside. Delivery to the 48 states is inside the price; it ships as a 64 lb parcel and checkout adds nothing. The Performance Optimized 15 inch ported wedge is $499.99. The $55 difference is the larger box and the port this driver needs to run at its rating.

The cabinet

36.00" W x 18.00" H x 14.00" 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, 14.0 inches deep. 15.59 inch frame, flush in the outer baffle layer, 14.12 inch cutout, 8.19 inches of mounting depth. It ships as a parcel.

NVX publishes a full Thiele-Small table for the VCW152v3 and VCW154v3 in its owner's manual and on the product pages, with a one-way Xmax of 23 mm, the driver displacement and the bolt circle, so nothing on this page is estimated. NVX's D2 and D4 columns for the VCW15v3 disagree on Vas by 26 percent, and each coil's own product page confirms its own column, so the cabinet is solved on both and passes on both. Tuning includes a 1.5 Hz fold loss that is an estimate, not a bench measurement.

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 11.6 mm of its 23.0 mm at 1800 W.

Enclosure Specifications

Series	Proline X Professional
Driver-Specific Fitment	NVX VCW15v3 D2/D4 (Dual 2 Ohm or Dual 4 Ohm)
Enclosure Type	Ported \| Front-Firing Standard Box
External Width	36.00 Inches
External Height	18.00 Inches
External Depth	14.00 Inches
Internal Volume (Gross)	3.62 Cubic Feet
Internal Volume (Net After Displacement)	2.83 Cubic Feet
Port Type	Vertical Slot Beside The Woofer \| Front Exit \| One 90 Degree Bend Along The Back Wall
Port Geometry	2.25 x 16.50 Inches, 37.1 Square Inches, 24.47 Inches Of Path
Port Area	37.1 Square Inches
Port Tuning (Fb)	32.5 Hz
Port Mouth	1/2 In Roundover On All Four Edges, 56.9 Square Inches At The Face
Port Air Velocity	21.9 m/s In The Channel, 14.3 m/s At The Mouth, At 1800 W (17.0 m/s Chuff Threshold)
Design Power Basis	1800 W RMS (1.2 x The Driver Rating) For Port Velocity And Excursion
Predicted F3	33.1 Hz (Anechoic)
Passband Ripple	2.41 dB (Anechoic)
Subsonic Filter	26 Hz High-Pass, 24 dB/Octave - REQUIRED On A Vented Enclosure
Driver Fs	29.30 Hz
Driver Qts	0.580
Driver Qes / Qms	0.770 / 2.440
Driver Vas	104.700 Liters / 3.697 Cubic Feet
Driver Sd	804.2 Square Centimeters
Driver Re	3.2 Ohm
Driver Xmax	23mm (One-Way)
Driver Displacement	0.13 Cubic Feet (Published by NVX)
Driver Sensitivity	88.0 dB
Driver Power Handling	1500 Watts RMS
Driver Overall Diameter	15.590 Inches (NVX Spec)
Mounting Depth Required	8.190 Inches (NVX Spec)
Cutout Diameter	14.125 Inches (NVX Spec)
Flush Mount Recess	16.500 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 NVX Logo Insert, Outer Layer, Standard
Mounting Hardware	Threaded Inserts On The Published 14.780 In Bolt Circle \| Stainless Machine Screws Included
Voice Coil Configuration	Dual 2 Ohm
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	1050-1500 Watts RMS (NVX Rated: 1500W RMS)
Carpet Finish	Plush Black
Shipping Weight	72 lb
Shipping	UPS Ground Parcel, Included In The 48 States
Bundle Options	Enclosure Only (Bring Your Own NVX VCW15v3)
Warranty	2-Year Limited (Enclosure)
Manufactured	Tullahoma, Tennessee, USA

Performance Graphs

Net airspace

2.83

cu ft

Tuning

32.5

Hz · Fb

Half power

33.1

Hz · F3, anechoic

Xmax at

7049

W RMS · 26 Hz subsonic

With NO filter

1105

W RMS · unfiltered

Port

14.3

m/s at the mouth · 1800 W

01Is this driver right for a ported box?

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

EBP = Fs ÷ Qes = 38.1

NVX VCW152v3 D2 · EBP 38.1

Under 50 the raw number leans sealed. The NVX VCW152v3 D2 reads 38.1, 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

2.83 cu ft net against a 104.7 L Vas, vented at 32.5 Hz.

Fb = 32.5 Hz · F3 = 33.1 Hz · passband ripple 2.41 dB

NVX VCW152v3 D2 · Fb 32.5 Hz, F3 33.1 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, 2.83 cu ft net vented at 32.5 Hz, against the 2.00 cu ft sealed wedge we build for this driver (PO 15-S W VCW).

Ported Fb 32.5 Hz · the 2.00 cu ft sealed box runs Qtc 0.98, Fc 49 Hz

Ported · this cabinet, 2.83 cu ft, Fb 32.5 HzSealed wedge we build, 2.00 cu ft, Qtc 0.98

Shaded blue is where the ported alignment is louder for the same power, orange where the sealed one is. The sealed curve is the 2.00 cu ft sealed wedge we build for this driver (PO 15-S W VCW), 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 3.7 dB at its widest and 3.3 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 2.00 cu ft sealed box 2.0 dB

Ported, in-car · 1.0 dB spreadSealed wedge we build, 2.00 cu ft, in-car · 2.0 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 2.0 dB for the 2.00 cu ft sealed wedge we build for this driver (PO 15-S W VCW). 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 NVX's published 23.0 mm. The two traces are the same cabinet with the subsonic filter switched on and switched off.

P_Xmax = 7049 W with a 26 Hz subsonic · 1105 W with none → the filter is worth 6.4×

7049 W · subsonic at 26 Hz, 24 dB/oct1105 W · no subsonic filterXmax 23.0 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 23.0 mm. With a 26 Hz subsonic that takes 7049 W, reached first at 49 Hz. Take the filter away and the same cabinet reaches 23.0 mm on 1105 W — the filter is worth 6.4× 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 1105 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 — NVX rate this one at 1500 W RMS, and that is the number that binds first here: heat stops you before travel does, so treat 1500 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

The VCW15v3 is the 15 inch in NVX's VC-Series v3: a carbon fiber enhanced non-pressed paper cone on a custom high roll foam surround with black nylon stitching, rated 1500 W RMS by NVX. NVX publishes the full Thiele-Small table, the displacement and the bolt circle for it in its owner's manual. NVX's 15 inch product pages repeat the 12 inch coil and magnet text word for word, so those two rows are left off here. This enclosure is cut for 8.19 in of mounting depth and a 14.21 in cutout, taken from NVX's published figures rather than measured off a sample. Where a rating below carries no reference condition, that is because the maker does not state one, and it is left as they print it.

Driver	NVX VCW15v3
Coil Options	Dual 2 Ohm or Dual 4 Ohm
Coil Wire	4-Layer High Temperature Black Aluminum
Cone	Carbon Fiber Enhanced Non-Pressed Paper Cone
Surround	Custom High Roll Foam Surround with black nylon stitching
Spider	Dual progressive-roll spiders
Lead Wires	integrated flat-braided leads
Basket	Die cast aluminum vented basket
Cooling	Optimized high-velocity pole vent; One-piece T-Yoke with integrated gap venting
Power, RMS	1500 W
Power, Peak	3000 W
Sensitivity	88 dB, 1W/1m
Mounting Depth	8.19 in
Cutout Diameter	14.21 in
Frame Outside Diameter	15.59 in
Driver Displacement	0.130 cu ft

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.