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Proline X Jeep Wrangler dual 12 down-fire enclosure, front view, Version Jeep 2 white Sahara acrylic insert
Proline X Jeep Wrangler dual 12 down-fire enclosure, front view, Version Jeep 3 white Willys acrylic insertProline X Jeep Wrangler dual 12 down-fire enclosure, front view, Version Jeep 4 white 392 acrylic insert

Vehicle Specific · Datasheet

Jeep Wrangler Edition Dual 12" Down-Firing Sealed Subwoofer Enclosure Stereo Integrity SQL-12 · Dual 12" Sealed enclosure

Net volume
2.05 Cubic Feet total, 1.025 per chamber (after SQL-12 displacement)
Max mounting depth
8.06 Inches
Cutout
11.375 Inches
External dimensions
38 Inches W × 10.31 Inches H × 16 Inches D
Buy at Audio IntensityFactory-direct, ships from Tullahoma
Jeep Wrangler JL / JK 4-door | SQL-12Buy at Audio Intensity
  • Best For: Jeep Wrangler JL and JK Unlimited (4-door) | Down-Firing | Stereo Integrity SQL-12
  • Net Volume: 2.05 cu ft (1.025 per chamber) | Sealed | Polyfill Pre-Installed
  • Driver Match: Pair of Stereo Integrity SQL-12 (matched) | 11.375" Cutout | 8.06" Max Mounting Depth
  • Construction: Dual Chamber | Double 1.5" Baffle, Flush Flange | Dado and V-Cut Joinery | Pre-Wired 12g OFC

Spec of record

Technical specifications

Internal Volume (Net)2.05 Cubic Feet total, 1.025 per chamber (after SQL-12 displacement)
Enclosure TypeSealed, Dual Chamber
Woofer OrientationDown-Firing
Optimized ForStereo Integrity SQL-12
Alignment (SQL-12)Qtc 0.759, Fc 45.4 Hz, F3 42.5 Hz anechoic
Material3/4" Langboard Elite MDF
Bottom Baffle1.5" double layer, flange recessed flush (toe mount)
ConstructionCNC-Cut / Dado and V-Cut Joinery / Full Divider
External Width38 Inches
External Depth16 Inches
External Height10.31 Inches
Woofer Cutout Diameter11.375 Inches
Flange Recess Diameter13.25 Inches
Max Mounting Depth8.06 Inches
Internal Wiring12-Gauge Oxygen-Free Copper (OFC)
Terminal TypeProline X Terminal Cup, side mounted
PolyfillPre-Installed
FeetIncluded
FinishPlush Black Automotive Carpet with Lasered Acrylic Insert
Vehicle FitmentJeep Wrangler JL Unlimited 4-door (2018 to 2026); Jeep Wrangler JK Unlimited 4-door (2007 to 2018). Not 2-door, not Gladiator.

Modelled response

Performance in this enclosure

Net airspace
1.025
cu ft per chamber
System Qtc
0.76
sealed
Half power
42.5
Hz · F3
Xmax at
2509
W RMS · no filter
With 25 Hz subsonic
3210
W RMS · +28%
Amplifier
1000
W RMS recommended
This enclosure holds 1.025 cu ft net per chamber. In it the Stereo Integrity SQL-12 runs a system Qtc of 0.76 with half power at 42.5 Hz, and the cone reaches its 26.0 mm travel limit at 2509 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 3210 W — +701 W, or 28 percent more power for the same 26.0 mm of travel.

01Is it a sealed driver?

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

EBP = Fs ÷ Qes = 55.0
SEALED 0–50 TRANSITION 50–100 PORTED 100–150 0 50 100 150 D2 55.0
D2 · EBP 55.0
At 55.0 the SQL-12 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

1.025 cu ft against a 22.5 L Vas.

α = Vas ÷ Vb = 0.77  ·  Fc = Fs√(α+1) = 45 Hz  ·  Qtc = 0.76
20 30 50 70 100 150 200 +6 +0 -6 -12 -18 -24 FREQUENCY · Hz LEVEL · dB −3 dB
D2 · Qtc 0.76, Fc 45 Hz, F3 42.5 Hz
The box lifts resonance from 34.1 Hz free-air to 45 Hz and half power lands at 42.5 Hz, anechoic, before any cabin gain. Parameters are Stereo Integrity’s published figures for the dual 2 ohm SQL-12; the dual 4 ohm shares the frame and mounting but is not plotted, because its electrical parameters are not part of this build’s verified set. Each driver has its own sealed chamber of 1.025 cu ft, net of the divider and of the SQL-12’s published 0.15 cu ft displacement. The box height was solved to that volume on a fixed 38 x 16 in footprint, so the Qtc plotted is the one this cabinet lands on, not a target. Curves are anechoic; the cargo floor and cabin gain add low end that is not shown.

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

PXmax = 2509 W unfiltered  →  3210 W with a 25 Hz subsonic
20 30 50 70 100 150 200 0 8 16 24 32 FREQUENCY · Hz CONE TRAVEL · mm PAST LINEAR TRAVEL · Xmax 26.0 mm 2509 W reaches Xmax here
D2 · 2509 W, no filterD2 · 3210 W with subsonic at 25 Hz, 24 dB/octXmax 26.0 mm one-way
Every trace touches the limit and no further, because each is drawn at the exact power that puts that coil on 26.0 mm. Unfiltered that is 2509 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 3210 W before hitting the same 26.0 mm. That is 28 percent more amplifier for the price of one filter setting.
ParamValueUnitNote
Fs34.10Hzfree-air resonance
Qts0.570D2
Vas22.50Lequivalent compliance
Sd532.3cm²effective piston area
Xmax26mm70% BL
Pe1000Wcontinuous RMS
SPL83.4dB1 W / 1 m, derived from T/S

Driver parameters as published by Stereo Integrity published T/S. Curves computed against this enclosure’s actual net airspace.

From the shop floor

Installer's take

This one was built around a pair of SQL-12s, and it shows in the numbers. Each driver gets its own 1.025 cu ft chamber after its own displacement comes out, and the SQL-12 lands at Qtc 0.759 in that. It is a touch punchy on paper, and in a Wrangler cargo area with the floor loading the cones that reads as weight, not boom.

The toe-mount baffle is the detail to notice at the bench. The outer layer is opened up so the 12.91 inch flange drops in flush, and your screws bite into a full 0.75 of MDF underneath. Nothing sticks out past the bottom face, so the feet set the real standoff.

Leads are pre-run to both cutouts and the far chamber is fed through a sealed pass in the divider. Pull the leads, connect, mount. Do not drill the divider to reroute anything; the two chambers are meant to stay apart.

Wire the D2 pair to a 2 ohm final load: coils in series on each sub, subs in parallel. Give each driver 700 to 1,000 W RMS. If you are running D4 SQL-12s, check that your amplifier is 1 ohm stable before you parallel everything; series coils into a 4 ohm load is the safe call.

Keep the feet that come with it. The standoff is part of how a down-fire works, and taller feet do not buy you more bass.

Before you order

Questions

Will this enclosure fit my Jeep?

It is built for the Jeep Wrangler JL Unlimited 4-door (2018 to 2026) and the Jeep Wrangler JK Unlimited 4-door (2007 to 2018). It does not fit 2-door Wranglers, which have about 14" of floor depth behind the upright rear seat against this box's 16", and it is not designed for the Jeep Gladiator. The enclosure measures 38"W x 16"D x 10.31"H and sits in the cargo area with no factory mounting point integration, so confirm your available cargo space against those dimensions before ordering.

Which subwoofers fit this enclosure?

It is optimized for the Stereo Integrity SQL-12, in either the dual 2 ohm or dual 4 ohm version; they share the frame, cutout and mounting depth. The baffle is cut to 11.375" with a 13.25" flush flange recess and 8.06" of mounting depth, so other 12" drivers inside those limits will fit mechanically. The published alignment is computed for the SQL-12 only.

Does this enclosure come with subwoofers?

No. This is an enclosure-only SKU; bring your own matched pair of SQL-12s. The enclosure ships with 12g OFC wiring pre-run to both cutouts and terminated at the Proline X terminal cup.

Why down-firing? What does it actually do acoustically?

Down-firing loads both drivers against the cargo floor. A hard boundary at close range reinforces low-frequency output and gives a broader, more even response than rear-firing in the same space. The practical benefit is a flat, load-bearing top, so you keep the cargo area.

What is the net internal volume, and is it per chamber or total?

2.05 cubic feet total, 1.025 per chamber. The two chambers are fully separate. The figure is net of the divider and of the SQL-12's published 0.15 cu ft displacement in each chamber. In that volume the SQL-12 runs Qtc 0.759, Fc 45.4 Hz and F3 42.5 Hz anechoic.

Is polyfill included, and does it come pre-installed?

Yes. Polyfill is pre-installed in both chambers at the factory, so packing density is consistent on every unit.

What is the double baffle and toe mount?

The bottom baffle is two laminated 0.75" layers, 1.5" total. The outer layer is cut to 13.25" so the SQL-12's 12.91" flange recesses flush; the inner layer carries the 11.375" cutout and takes the mounting screws. The driver is held by solid MDF and nothing protrudes past the bottom face.

What comes in the box?

The enclosure with your chosen front graphic (Version Jeep 1, 2, 3 or 4) and four mounting feet. Internal 12g OFC wiring is pre-run and terminated at the Proline X terminal cup, and polyfill is pre-installed. Subwoofers are not included.

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