A Proline PO 15-S W CompVX subwoofer enclosure shown on a dark promotional graphic with dimensions labeled 26.25 inches by 18 inches and feature text on the left.

A Proline Performance Optimized Series CompVX woofer enclosure, part PO 15-S W, shown as a 16.65 by 10.

Proline X

Performance Optimized Wedge Sealed 15" Enclosure | Kicker Comp VX 15

Q: Will this enclosure fit both the 50CVX152 and 50CVX154?

Yes. The cutout, mounting depth, and terminal cup wiring are direct-fit for either impedance option. Choose based on your amplifier's ideal load.

Q: Why did you pick 1.80 cubic feet instead of a different volume?

1.80 cubic feet net matches Kicker's own recommended minimum sealed enclosure for the Comp VX 15 and puts the driver at a Qtc of 0.65 based on bench-measured T/S parameters. This driver has an unusually large Vas of 4.18 cubic feet, and it fundamentally wants air to work with. Kicker's maximum sealed spec goes to 5.2 cubic feet for deeper extension in cube-format installs. 1.80 is the sweet spot that gives the driver room to breathe while keeping the wedge footprint practical for trunk installations.

Q: What amplifier power should I run to this enclosure?

The Kicker Comp VX 15 is rated at 1000 watts RMS continuous. For a clean, headroom-rich musical system in this sealed alignment, target 700 to 1000 watts RMS at the woofer's impedance. It will happily accept the full 1000 watts but does not require it to sound its best.

Q: How does a wedge enclosure improve the sound in a trunk installation?

The driver mounts on the vertical face at the back of the box and fires rearward into the trunk cavity, using the trunk itself as an extension of the acoustic system. The angled face is on the opposite side, matching the roughly 20 degree lean of a factory rear seat back so the cabinet tucks in with no wasted gap. Firing into the trunk cavity takes advantage of the trunk's natural transfer function, loads the cabin efficiently, and reduces the standing-wave interaction that a flat-front box parallel to the rear seat can produce.

Q: Why is the front baffle double-layered on this enclosure?

All Performance Optimized Series enclosures use a double-layer 1.5 inch front baffle made from two bonded sheets of 3/4 inch Langboard Elite MDF. The Kicker Comp VX 15 exerts significant mechanical load into its mounting flange at high output. A single 3/4 inch baffle can flex under that load and telegraph energy back into the cone. The double baffle eliminates that entirely and gives the driver a rigid, isolated mounting platform.

Q: What is the expected low-frequency extension of this enclosure?

At the Qtc 0.65 alignment, the predicted -3 dB point is approximately 52 Hz, with usable output well below that as cabin gain takes over in most vehicles. Effective in-car response typically extends down into the mid 20 Hz range depending on the specific vehicle acoustics.

Q: Do I need to add any additional damping or polyfill to this enclosure?

No additional damping is required. The enclosure ships with polyfill pre-installed to the correct density for the volume and alignment. Adding more polyfill will effectively increase the perceived volume and shift the alignment. Removing it will do the opposite.

Q: Is the Kicker Comp VX 15 subwoofer included with this enclosure?

No. This listing is for the enclosure only. Bring your own 50CVX152 (DVC 2Ω) or 50CVX154 (DVC 4Ω) driver.

SKU: PO 15-S W CompVX BB

QUICK SPECS

Best For: Kicker Comp VX 15 Trunk-Fit Daily Driver Builds
Net Volume: 1.80 cu ft (2.00 cu ft Gross)
Driver Match: Kicker Comp VX 15
Construction: Rear-Firing Wedge | V-Groove/Dado | Double 1.5" Baffle | Threaded Inserts

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.

$ 379.99

Acrylic Insert Color

In Stock and Ready to Ship

Financing available. Choose Shop Pay Installments at checkout.

Performance Optimized Wedge Sealed 15" Enclosure | Kicker Comp VX 15

Enclosure Type Sealed

External Dimensions 23" W x 18" H x 16.65" D at base tapering to 10.1" D at top

Net Volume 1.80cu ft

Tuning Frequency N/A (Sealed)

Cutout Diameter Direct Fit

Front Panel Thickness 1.5"

Max Mounting Depth Direct Fit

INSTALLER'S TAKE

The Comp VX 15 sits one step below the flagship CompQ 15 in Kicker's round subwoofer lineup, but the gap between them is narrower than most people assume. It uses the same SoloKon cone technology, the same L7-derived motor architecture, and the same suspension philosophy. Where the CompQ pushes further on Xmax and thermal headroom, the Comp VX gives you the same tonal character with 1000 watts of continuous power handling in a 15-inch package.

I built this one to 1.80 cubic feet net, matching Kicker's own recommended minimum sealed enclosure. That puts the driver at a Qtc of 0.65 based on bench-measured T/S parameters, which is an extended musical alignment that lets the Comp VX 15 breathe and pull the deep low-end reach a 15-inch driver is bought for. In this wedge that loads the trunk this cleanly, it delivers exactly the tight-but-extended character these drivers are designed around.

One note on this driver specifically: bench-measured Vas comes in at 4.18 cubic feet, which is unusually large. That means the Comp VX 15 fundamentally rewards being given air to work with. Kicker's maximum sealed spec goes all the way to 5.2 cubic feet for that reason. If you want more low-end extension than this wedge geometry allows, a larger cube-format enclosure will get you there, but the wedge at 1.80 net is a genuinely satisfying alignment for the trunk install use case.

The double-baffle 1.5" front is not optional on this driver. The Comp VX 15 puts serious mechanical load into the mounting flange at high output, and a single 3/4" layer will telegraph flex back into the cone. Two bonded 3/4" layers with the CNC-precision cutout stops that entirely and gives the driver the rigid mounting platform it deserves.

If you're bringing your own amp, target 700-1000 watts RMS at the woofer's impedance for a clean, headroom-rich musical system. The Comp VX 15 is rated to 1000 watts RMS continuous and does not need more than that to sound its best.

Product Details

Performance Optimized Wedge | Kicker Comp VX 15

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

2.0 ft³ Gross1.80 ft³ NetRear-Firing Wedge23" × 18" × 10.1/16.65"V-Groove / DadoBuilt in Tennessee

The Kicker Comp VX 15 in a Purpose-Built Sealed Wedge

The Comp VX 15 is Kicker's high-value 15-inch performance driver. DVC 2Ω or DVC 4Ω configurations, ribbed polyurethane surround, stamped steel basket. Rated 750W RMS, plays clean well below that in a properly-sized sealed cabinet.

2.0 cu ft gross internal volume produces 1.80 cu ft net after driver displacement. Butterworth alignment at Qtc 0.65 for musical, controlled output.

Trunk-Load Wedge Design Explained

This wedge is not a front-firing enclosure. The Comp VX 15 mounts on the vertical trunk-lid-side face and fires rearward into the trunk cavity. Angled face on the opposite side tucks against the rear seat back.

Seat-Side Face Matches Seat Lean

Most factory rear seats lean ~20 degrees from vertical. Angled face matches that lean.

Trunk-Lid-Side Face Fires the Woofer

Vertical face is where the Comp VX 15 mounts. Cone fires rearward into the trunk cavity.

Trunk Cavity Loading

Using the trunk itself as acoustic extension. Low frequencies transmit through rear deck and seat back for smooth, less-localized presentation.

Preserves Trunk Cargo Space

Wedge tucks against the seat back. Cargo space in front stays usable.

Engineered for the Kicker Comp VX 15

Built to 1.80 cubic feet net. Puts the Comp VX 15 at Qtc 0.65 based on bench T/S, an extended Butterworth alignment optimized for musical performance in trunk installations.

Alignment Numbers

Target System Qtc: 0.65 · F3: ~52 Hz · Fc: ~46 Hz

Mounting Geometry

Vertical baffle CNC-cut to 14.0" (Kicker spec). Mounting depth required 7.5". 8/32 threaded inserts pressed into baffle backside.

Performance Series Construction, Driver-Specific Tuning

Langboard Elite MDF

Premium 3/4" MDF panels, denser and more stable than commodity MDF.

V-Groove and Dado Joinery

CNC-cut V-grooves at every panel intersection for maximum glue surface.

Double-Layer 1.5" Front Baffle

Two bonded 3/4" MDF sheets at the driver mounting face.

Pre-Wired Terminal Cup

Proline X ABS/carbon-fiber composite, 12g OFC pre-wired.

Customize Your Build

Carpet Finish

Charcoal gray trunk liner standard; plush black +$10.

Acrylic Insert Color

Black, Blue, Red, White, or none (-$40).

Box-Only or Loaded

Box-only: bring your own Comp VX 15.

Wiring the Kicker Comp VX 15 to Your Amplifier

Ships DVC 2Ω or DVC 4Ω. Target 600-750W RMS at the woofer's impedance. Comp VX 15 rated 750W RMS continuous.

Built in Tennessee, Backed by Audio Intensity

Manufactured in Tullahoma, Tennessee on our ShopSabre CNC equipment. 1-year limited warranty. Call 931-563-5151.

Kicker Comp VX 15: Precision-Tuned in a Trunk-Load Wedge

1.80 cubic feet net at Butterworth Qtc 0.65 in a wedge that fires the driver rearward into the trunk cavity.

Specifications

Enclosure Type	Sealed \| Wedge Geometry \| Rear-Firing Trunk-Load
Driver-Specific Fitment	Kicker Comp VX 15 - 50CVX152 (DVC 2Ω) or 50CVX154 (DVC 4Ω)
Internal Volume (Gross)	2.00 Cubic Feet
Internal Volume (Net After Displacement)	1.80 Cubic Feet
Target System Qtc	0.65 (Musical Alignment \| Matches Kicker MIN Sealed Spec)
Predicted F3	~52 Hz
Predicted Fc	~48 Hz
Driver Displacement	0.20 Cubic Feet (Estimated - Kicker Does Not Publish)
Baffle Configuration	Vertical Trunk-Lid-Side Woofer Mounting Face
Material	Langboard Elite 3/4" MDF
Front Baffle Construction	Double-Layer 1.5" MDF (Two 3/4" Sheets Bonded)
Joinery	V-Groove and Dado (CNC-Cut)
Construction	ShopSabre CNC / Angled Seat-Side Compound Cuts / Perimeter Cross-Brace
External Width	23 Inches
External Height	18 Inches
External Depth (Top)	10.1 Inches
External Depth (Bottom)	16.65 Inches
Baffle Angle	~20° From Vertical (Seat-Side Face)
Mounting Hole Diameter	13.8125 Inches (Kicker Spec)
Mounting Depth Required	8.5 Inches (Kicker Spec)
Mounting Hardware	8/32 Threaded Inserts \| Stainless Steel Machine Screws Included
Terminal Cup	Proline X ABS/Carbon Fiber Composite \| 12g OFC Pre-Wired
Damping	Polyfill Pre-Installed
Recommended Power	700-1000 Watts RMS (Kicker Rated: 1000W RMS Continuous)
Carpet Finish	Dark Gray Trunkliner (Standard) or Plush Black (+$10)
Acrylic Insert	Black, Blue, Red, White, or None (-$40)
Bundle Options	Enclosure Only (Bring Your Own 50CVX152 or 50CVX154)
Warranty	1-Year Limited (Enclosure)
Manufactured	Tullahoma, Tennessee, USA

Performance Graphs

Net airspace

1.80

cu ft per chamber

System Qtc

0.58–0.65

sealed

Half power

52.8–59.5

Hz · F3

Xmax at

1307

W RMS · no filter

With 25 Hz subsonic

1895

W RMS · +45%

Amplifier

1500

W RMS recommended

This enclosure holds 1.80 cu ft net per chamber. In it the Kicker CompVX 15 (50CVX152) runs a system Qtc of 0.58–0.65 with half power at 52.8–59.5 Hz, and the cone reaches its 20.65 mm travel limit at 1307 W, below the driver’s 1500 W thermal rating, so travel is what stops you here, not heat. Run a subsonic filter at 25 Hz and that becomes 1895 W — +588 W, or 45 percent more power for the same 20.65 mm of travel.

01Is it a sealed driver?

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

EBP = Fs ÷ Qes = 72.4–79.0

D2 · EBP 79.0D4 · EBP 72.4

At 72.4–79.0 the CompVX 15 (50CVX152) sits in the transition band, not the sealed band. That is not a mismatch: a transition motor works in either alignment, and sealed buys a smaller box and a gentler roll-off at the cost of some low-end output. Stage 02 shows what this airspace actually does with it.

02What the box does to it

1.80 cu ft against a 113.1 L Vas.

α = Vas ÷ Vb = 2.22 · Fc = Fs√(α+1) = 47–48 Hz · Qtc = 0.58–0.65

D2 · Qtc 0.58, Fc 47 Hz, F3 59.5 HzD4 · Qtc 0.65, Fc 48 Hz, F3 52.8 Hz

The box lifts resonance from 26.0 Hz free-air to 47–48 Hz and half power lands at 52.8–59.5 Hz, anechoic, before any cabin gain. This enclosure ships without a driver, so both coil variants the maker offers are plotted. They do not load the same box the same way.

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

P_Xmax = 1307–1354 W unfiltered → 1895–2071 W with a 25 Hz subsonic

D2 · 1307 W, no filterD4 · 1354 W, no filterD2 · 2071 W with subsonic at 25 Hz, 24 dB/octD4 · 1895 W with subsonic at 25 Hz, 24 dB/octXmax 20.65 mm one-way

Every trace touches the limit and no further, because each is drawn at the exact power that puts that coil on 20.65 mm. Unfiltered that is 1307 W, reached first at 20 Hz. It sits under the 1500 W the driver can take thermally, so the enclosure sets the ceiling, not the voice coil. 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 1895 W before hitting the same 20.65 mm. That is 45 percent more amplifier for the price of one filter setting.

Param	Value	Unit	Note
Fs	26.00	Hz	free-air resonance
Qts	0.321 / 0.358		D2 / D4
Vas	113.05 / 118.42	L	equivalent compliance
Sd	845.0	cm²	effective piston area
Xmax	20.65	mm	one-way linear travel
Pe	1500	W	continuous RMS
SPL	89.7	dB	1 W / 1 m, derived from T/S

Driver parameters as published by Kicker published Klippel T/S sheet. 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.