A Proline PO 12-S W CompVX subwoofer enclosure shown on a dark promotional graphic with dimensions labeled 19.75 inches by 15 inches and feature text on the left.A dark gray wedge-shaped CompVX subwoofer enclosure shown on a black background with dimension labels 15 inches tall, 9 inches wide at the top, and 14.4 inches wide at the bottom.

Performance Optimized · Datasheet

Performance Optimized Wedge Sealed 12" Enclosure | Kicker Comp VX 12 Single 12" Sealed enclosure

Net volume
1.00 Cubic Feet
Max mounting depth
6.6875 Inches (Kicker Spec)
Cutout
11.0625 Inches (Kicker Spec)
External dimensions
19.75 Inches W × 15 Inches H × 9 Inches / 14.4 Inches D
Front baffle
Vertical Trunk-Lid-Side Woofer Mounting Face
Buy at Audio Intensity
  • Best For: Kicker Comp VX 12 Trunk-Fit Daily Driver Builds
  • Net Volume: 1.00 cu ft (1.15 cu ft Gross)
  • Driver Match: Kicker Comp VX 12
  • Construction: Rear-Firing Wedge | V-Groove/Dado | Double 1.5" Baffle | Threaded Inserts

Technical specifications

Enclosure TypeSealed | Wedge Geometry | Rear-Firing Trunk-Load
Driver-Specific FitmentKicker Comp VX 12 - 50CVX122 (DVC 2Ω) or 50CVX124 (DVC 4Ω)
Internal Volume (Gross)1.15 Cubic Feet
Internal Volume (Net After Displacement)1.00 Cubic Feet
Target System Qtc0.65 (Musical Alignment | Matches Kicker MIN Sealed Spec)
Predicted F3~55 Hz
Predicted Fc~51 Hz
Driver Displacement0.15 Cubic Feet (Estimated - Kicker Does Not Publish)
Baffle ConfigurationVertical Trunk-Lid-Side Woofer Mounting Face
MaterialLangboard Elite 3/4" MDF
Front Baffle ConstructionDouble-Layer 1.5" MDF (Two 3/4" Sheets Bonded)
JoineryV-Groove and Dado (CNC-Cut)
ConstructionShopSabre CNC / Angled Seat-Side Compound Cuts / Perimeter Cross-Brace
External Width19.75 Inches
External Height15 Inches
External Depth (Top)9 Inches
External Depth (Bottom)14.4 Inches
Baffle Angle~20° From Vertical (Seat-Side Face)
Mounting Hole Diameter11.0625 Inches (Kicker Spec)
Mounting Depth Required6.6875 Inches (Kicker Spec)
Mounting Hardware8/32 Threaded Inserts | Stainless Steel Machine Screws Included
Terminal CupProline X ABS/Carbon Fiber Composite | 12g OFC Pre-Wired
DampingPolyfill Pre-Installed
Recommended Power500-750 Watts RMS (Kicker Rated: 750W RMS Continuous)
Carpet FinishDark Gray Trunkliner (Standard) or Plush Black
Acrylic InsertBlack, Blue, Red, White, or None
Bundle OptionsEnclosure Only (Bring Your Own 50CVX122 or 50CVX124)
Warranty1-Year Limited (Enclosure)
ManufacturedTullahoma, Tennessee, USA

Performance in this enclosure

Net airspace
1.00
cu ft per chamber
System Qtc
0.60–0.65
sealed
Half power
55.3–59.7
Hz · F3
Xmax at
989
W RMS · no filter
With 25 Hz subsonic
1354
W RMS · +37%
Amplifier
1250
W RMS recommended
This enclosure holds 1.00 cu ft net per chamber. In it the Kicker CompVX 12 (50CVX122) runs a system Qtc of 0.60–0.65 with half power at 55.3–59.7 Hz, and the cone reaches its 19.25 mm travel limit at 989 W, below the driver’s 1250 W thermal rating, so travel is what stops you here, not heat. Run a subsonic filter at 25 Hz and that becomes 1354 W — +365 W, or 37 percent more power for the same 19.25 mm of travel.

01Is it a sealed driver?

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

EBP = Fs ÷ Qes = 75.0–79.3
SEALED 0–50 TRANSITION 50–100 PORTED 100–150 0 50 100 150 D2 79.3 D4 75.0
D2 · EBP 79.3D4 · EBP 75.0
At 75.0–79.3 the CompVX 12 (50CVX122) 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

1.00 cu ft against a 39.0 L Vas.

α = Vas ÷ Vb = 1.38  ·  Fc = Fs√(α+1) = 50–51 Hz  ·  Qtc = 0.60–0.65
20 30 50 70 100 150 200 +6 +0 -6 -12 -18 -24 FREQUENCY · Hz LEVEL · dB −3 dB
D2 · Qtc 0.60, Fc 50 Hz, F3 59.7 HzD4 · Qtc 0.65, Fc 51 Hz, F3 55.3 Hz
The box lifts resonance from 32.2 Hz free-air to 50–51 Hz and half power lands at 55.3–59.7 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 19.25 mm — and a bigger one once a subsonic filter stops it wasting travel below the passband.

PXmax = 989–992 W unfiltered  →  1354–1457 W with a 25 Hz subsonic
20 30 50 70 100 150 200 0 4 8 12 16 20 24 FREQUENCY · Hz CONE TRAVEL · mm PAST LINEAR TRAVEL · Xmax 19.25 mm 989 W reaches Xmax here
D2 · 989 W, no filterD4 · 992 W, no filterD2 · 1457 W with subsonic at 25 Hz, 24 dB/octD4 · 1354 W with subsonic at 25 Hz, 24 dB/octXmax 19.25 mm one-way
Every trace touches the limit and no further, because each is drawn at the exact power that puts that coil on 19.25 mm. Unfiltered that is 989 W, reached first at 20 Hz. It sits under the 1250 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 1354 W before hitting the same 19.25 mm. That is 37 percent more amplifier for the price of one filter setting.
ParamValueUnitNote
Fs32.20Hzfree-air resonance
Qts0.391 / 0.413D2 / D4
Vas38.96 / 42.17Lequivalent compliance
Sd522.8cm²effective piston area
Xmax19.25mmone-way linear travel
Pe1250Wcontinuous RMS
SPL86.9dB1 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.

Installer's take

The Comp VX 12 sits one step below the flagship CompQ 12 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 750 watts of continuous power handling.

I built this one to 1.00 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 12 breathe and pull deeper low-end reach than a tighter tune would allow. In this wedge that loads the trunk this cleanly, it delivers the tight-but-extended character these drivers are designed around.

The double-baffle 1.5" front is not optional on this driver. The Comp VX 12 puts real 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 500-750 watts RMS at the woofer's impedance for a clean, headroom-rich musical system. The Comp VX 12 is rated to 750 watts RMS continuous and does not need more than that to sound its best.

Questions

Will this enclosure fit both the 50CVX122 and 50CVX124?

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

Why did you pick 1.00 cubic feet instead of a different volume?

1.00 cubic feet net matches Kicker's own recommended minimum sealed enclosure for the Comp VX 12 and puts the driver at a Qtc of 0.65 based on bench-measured T/S parameters. Kicker's engineers designed this driver around an extended musical alignment, and their maximum sealed spec of 4.6 cubic feet drops Qtc even lower for more extension. 1.00 is the sweet spot that gives the driver room to breathe without going overboard on cabinet size for a wedge-format trunk install.

What amplifier power should I run to this enclosure?

The Kicker Comp VX 12 is rated at 750 watts RMS continuous. For a clean, headroom-rich musical system in this sealed alignment, target 500 to 750 watts RMS at the woofer's impedance. It will happily accept the full 750 watts but does not require it to sound its best.

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.

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 12 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.

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

At the Qtc 0.65 alignment, the predicted -3 dB point is approximately 55 Hz, with usable output well below that as cabin gain takes over in most vehicles. Effective in-car response typically extends down into the upper 20 Hz range depending on the specific vehicle acoustics.

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.

Is the Kicker Comp VX 12 subwoofer included with this enclosure?

No. This listing is for the enclosure only. Bring your own 50CVX122 (DVC 2Ω) or 50CVX124 (DVC 4Ω) driver.

Other Performance Optimized models