A Proline PO 12-S W CompQ 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 CompQ performance-optimized subwoofer enclosure shown on a dark studio background with dimension callouts: 13 inches height, 13.2 inches width, and 8.

Performance Optimized · Datasheet

Performance Optimized Wedge Sealed 12" Enclosure | Kicker CompQ 12 Single 12" Sealed enclosure

Net volume
1.37 Cubic Feet
Max mounting depth
7.125 Inches (Kicker Spec)
Cutout
11.0625 Inches (Kicker Spec)
External dimensions
25 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 CompQ 12 Trunk-Fit Daily Driver Builds
  • Net Volume: 1.37 cu ft (1.52 cu ft Gross)
  • Driver Match: Kicker CompQ 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 CompQ 12 - 51CWQ122 (DVC 2Ω) or 51CWQ124 (DVC 4Ω)
Internal Volume (Gross)1.52 Cubic Feet
Internal Volume (Net After Displacement)1.37 Cubic Feet
Target System Qtc0.79 (Punchy-Musical Alignment | Based on Bench-Measured T/S)
Predicted F3~46 Hz
Predicted Fc~52 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 Width25 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 Required7.125 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 Power700-900 Watts RMS (Kicker Rated: 1000W RMS Continuous)
Carpet FinishDark Gray Trunkliner (Standard) or Plush Black
Acrylic InsertBlack, Blue, Red, White, or None
Bundle OptionsEnclosure Only (Bring Your Own 51CWQ122 or 51CWQ124)
Warranty1-Year Limited (Enclosure)
ManufacturedTullahoma, Tennessee, USA

Performance in this enclosure

Net airspace
1.37
cu ft per chamber
System Qtc
0.71–0.78
sealed
Half power
42.0–43.2
Hz · F3
Xmax at
1323
W RMS · no filter
With 25 Hz subsonic
1815
W RMS · +37%
Amplifier
1000
W RMS recommended
This enclosure holds 1.37 cu ft net per chamber. In it the Kicker CompQ 12 (51CWQ122) runs a system Qtc of 0.71–0.78 with half power at 42.0–43.2 Hz, and the cone reaches its 23.0 mm travel limit at 1323 W, above the driver’s 1000 W thermal rating, so heat stops you before travel does. Run a subsonic filter at 25 Hz and that becomes 1815 W — +492 W, or 37 percent more power for the same 23.0 mm of travel.

01Is it a sealed driver?

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

EBP = Fs ÷ Qes = 55.4–58.3
SEALED 0–50 TRANSITION 50–100 PORTED 100–150 0 50 100 150 D2 58.3 D4 55.4
D2 · EBP 58.3D4 · EBP 55.4
At 55.4–58.3 the CompQ 12 (51CWQ122) 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

1.37 cu ft against a 25.7 L Vas.

α = Vas ÷ Vb = 0.66  ·  Fc = Fs√(α+1) = 43–46 Hz  ·  Qtc = 0.71–0.78
20 30 50 70 100 150 200 +6 +0 -6 -12 -18 -24 FREQUENCY · Hz LEVEL · dB −3 dB
D2 · Qtc 0.71, Fc 43 Hz, F3 43.2 HzD4 · Qtc 0.78, Fc 46 Hz, F3 42.0 Hz
The box lifts resonance from 33.5 Hz free-air to 43–46 Hz and half power lands at 42.0–43.2 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 23.0 mm — and a bigger one once a subsonic filter stops it wasting travel below the passband.

PXmax = 1323–1478 W unfiltered  →  1815–1875 W with a 25 Hz subsonic
20 30 50 70 100 150 200 0 8 16 24 FREQUENCY · Hz CONE TRAVEL · mm PAST LINEAR TRAVEL · Xmax 23.0 mm 1323 W reaches Xmax here
D2 · 1323 W, no filterD4 · 1478 W, no filterD2 · 1875 W with subsonic at 25 Hz, 24 dB/octD4 · 1815 W with subsonic at 25 Hz, 24 dB/octXmax 23.0 mm one-way
Every trace touches the limit and no further, because each is drawn at the exact power that puts that coil on 23.0 mm. Unfiltered that is 1323 W, reached first at 20 Hz. It sits above the 1000 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: stopping the cone wasting travel below the passband lets it take 1815 W before hitting the same 23.0 mm. That is 37 percent more amplifier for the price of one filter setting.
ParamValueUnitNote
Fs33.50Hzfree-air resonance
Qts0.548 / 0.612D2 / D4
Vas25.67 / 25.08Lequivalent compliance
Sd506.7cm²effective piston area
Xmax23mmone-way linear travel
Pe1000Wcontinuous RMS
SPL84.1dB1 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 CompQ 12 is Kicker's best round 12-inch driver, period. It shares the motor architecture and cone technology of the Solo-Baric L7 but in a round basket, and when you give it a musical sealed box it plays with the same articulation and tonal accuracy as the top SQ competition drivers in this class, with more headroom than most.

I built this one to 1.37 cubic feet net, which puts the CompQ 12 at a Qtc of 0.79 based on bench-measured T/S parameters. That's punchier than pure Butterworth, sitting just above the musical sweet spot with a touch of extra midbass emphasis. On this driver, in a wedge that loads the trunk this cleanly, 0.79 is the alignment that hits kick drums with authority and stays composed on complex low-end passages.

The CompQ 12's bench Qts of 0.6115 sets a hard floor on how loose the alignment can go. Even an infinite box won't drop Qtc below that number. This driver is fundamentally a punchy-musical driver, not a Bessel-alignment SQ driver, and this cabinet respects that character while giving it enough air to breathe.

The double-baffle 1.5" front is not optional on this driver. The CompQ 12 has a heavy motor structure and puts real mechanical load into the mounting flange at high output. A single 3/4" baffle 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 700-900 watts RMS at the woofer's impedance for a clean, headroom-rich musical system. The CompQ 12 is rated to 1000 watts RMS continuous and will handle it all day, but it doesn't need the full spec to sound its best.

Questions

Will this enclosure fit both the 51CWQ122 and 51CWQ124?

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 1.37 cubic feet instead of Kicker's 0.88 to 2.0 cubic foot range?

1.37 cubic feet net puts the Kicker CompQ 12 at a Qtc of 0.79 based on bench-measured T/S parameters, a punchy-musical alignment with excellent transient control. Using the same bench data, Kicker's 0.88 cubic foot minimum produces a punchier Qtc around 0.87, and their 2.0 cubic foot maximum settles at Qtc 0.74. 0.79 sits in the sweet spot for this driver where midbass impact, transient response, and low-frequency extension all balance.

What amplifier power should I run to this enclosure?

The Kicker CompQ 12 is rated at 1000 watts RMS continuous. For a clean, headroom-rich musical system in this sealed alignment, target 700 to 900 watts RMS at the woofer's impedance. It will happily accept the full 1000 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 CompQ 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 0.79 alignment, the predicted -3 dB point is approximately 46 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 to 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 CompQ 12 subwoofer included with this enclosure?

No. This listing is for the enclosure only. Bring your own 51CWQ122 (DVC 2Ω) or 51CWQ124 (DVC 4Ω) driver.

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