Proline X

Proline X Performance Optimized Wedge Enclosure | Fits Dual Kicker Solo-Baric L7R 10" Subwoofers

Q: Will my Kicker Solo-Baric L7R 10s fit this enclosure?

Yes. Both baffle openings are CNC-cut to Kicker's published 9-5/16 inch square cutout for the Solo-Baric L7R 10, and each chamber clears the required 6-1/8 inch mounting depth with generous margin. Both the dual 2-ohm 45L7R102 and the dual 4-ohm 45L7R104 share the same frame and drop in identically.

Q: Why two separate chambers instead of one shared volume?

In a shared volume each cone's back pressure acts on the other one, so the two drivers are mechanically coupled through the air. Any mismatch between them, whether from manufacturing tolerance, uneven break-in, or one driver starting to fail, gets shared across the pair instead of staying put. You also lose the ability to run either driver alone without the alignment changing.Isolated chambers mean each L7R sees exactly the 0.82 cubic feet of gross airspace it was solved for, independent of what the other one is doing. The full-height divider that makes this possible is dado-locked into the top, bottom, front and back panels, so it also serves as the primary brace across the 29.75 inch span. You get better mechanical behavior and a stiffer cabinet from the same piece of MDF.

Q: Do both subwoofers need to be the same coil version?

Yes, run matching coil versions in both chambers. Mixing a dual 2-ohm with a dual 4-ohm creates an impedance imbalance that sends unequal power to the two drivers, and the pair will no longer play at matched levels no matter how the wiring is arranged.Which matched pair you pick is genuinely free choice. Both coil versions land on Butterworth in this airspace, Qtc 0.705 and 0.710, so the acoustic result is the same either way. A pair of dual 2-ohm drivers gives you 0.5, 2, or 8 ohm system options; a pair of dual 4-ohm gives 1, 4, or 16. Buy whichever pair lets your amplifier make clean rated power.

Q: How does the dual 10 compare to a single 12 or a ported build?

Two 10s give you roughly 6 dB more output than one for the same alignment and the same character, which is a much larger jump than moving from a 10 to a 12. The pair also splits the work, so each driver runs at lower excursion for a given output level and stays further inside its linear range.Against a ported build, the trade is the usual one. Ported would give more output in a narrow band near tuning but needs roughly double the airspace per driver, which defeats the purpose of a behind-seat wedge. The L7R's efficiency bandwidth product of 68.4 to 71.2 puts it in the transition band, meaning it works honestly in either alignment, so this is a real choice rather than a compromise. For a truck cab where depth is the binding constraint, sealed wins, and this cabinet is only 14.35 inches deep at the floor.

Q: Will this wedge fit behind the seat of my truck?

You need 29.75 inches of width, 13.5 inches of height, and 14.35 inches of depth at the floor; the top of the box needs only 9.47 inches because the baffle rakes back 20 degrees to follow the seat lean. The rear panel is fully vertical and sits flat against the cab wall. The width is the number to check first, since a dual 10 wedge needs a full-width crew cab or extended cab bench to sit behind. Measure the back wall of the cab from trim panel to trim panel, not the seat.

Q: Are the subwoofers included with this enclosure?

No, this listing is the enclosure only. It is built specifically for a matched pair of Kicker Solo-Baric L7R 10s in either coil configuration, and you install your own drivers using the pressed 8/32 threaded inserts and included stainless mounting hardware. If you want help pairing drivers or an amplifier with it, call us at 931-563-5151.

SKU: PO 10D-S W L7R

QUICK SPECS

Alignment: Two isolated sealed chambers, 0.82 cu ft gross each (about 0.72 net, 1.44 net total), Butterworth on both coils. Dual 2-ohm 45L7R102s run Qtc 0.705, Fc 51.1 Hz, F3 51.2 Hz; dual 4-ohm 45L7R104s run Qtc 0.710, Fc 53.8 Hz, F3 53.6 Hz per chamber
Chambers: Full-height 3/4 in dado-locked divider, one driver per chamber, doubles as the primary brace across the 29.75 in span
Drivers: Matched pair of Kicker Solo-Baric L7R 10s, same coil version in both chambers. Each opening CNC-cut to 9-5/16 in square per Kicker spec, only 6-1/8 in mounting depth needed
Wiring: One shared side-mounted terminal cup, 12 gauge OFC to both positions. Kicker rates 500 W RMS each, about 1000 W system
Cabinet: 29.75 in W x 13.5 in H x 9.47/14.35 in D, 3/4 in Langboard Elite MDF, 1.5 in double baffle plus trim, plush black carpet with black acrylic insert

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.

$ 299.99

In Stock and Ready to Ship

Financing available. Choose Shop Pay Installments at checkout.

Proline X Performance Optimized Wedge Enclosure | Fits Dual Kicker Solo-Baric L7R 10" Subwoofers

$ 299.99

Enclosure Type Sealed

External Dimensions 29.75" W x 13.5" H x 9.47" top / 14.35" bottom D (20° wedge)

Net Volume 1.44 net total / 0.72 per chamber (0.82 gross per chamber)cu ft

Tuning Frequency N/A (Sealed)

Cutout Diameter Direct Fit

Front Panel Thickness 1.5"

Max Mounting Depth Direct Fit

INSTALLER'S TAKE

A pair of L7R 10s in isolated chambers is my favorite way to do bass in a crew cab, and it beats going up in driver size for the same reason it always does. Two 10s give you about 6 dB over one, each cone works less hard for a given output, and you keep the shallow 6-1/8 inch mounting depth that makes the L7R so easy to place. A single 12 in the same footprint would move less air and need more depth.

Both coil versions landing on Butterworth is the part that makes this easy to sell and easy to live with. Qtc 0.705 and 0.710 in the same cabinet is not a difference you or anyone else can hear, so pick the pair that lands your amplifier on a load it likes. A pair of dual 2-ohm drivers is usually the easier answer for a modern class D monoblock that wants to see 1 ohm.

The divider is not just a partition. It is dado-locked into four panels and it is the reason a 29.75 inch wide cabinet does not need a separate brace across the span. Every dual chamber box should be built this way and plenty are not.

Check the 29.75 inch width before anything else. Depth came down to 14.35 at the floor because this driver only needs 6-1/8 inches and I put some of the airspace into width instead, which is the right trade in a truck where the back wall has room and the seat track does not. But it does mean width is the number that rules this in or out. Measure the back wall from trim panel to trim panel, not the seat.

Product Details

Performance Optimized Wedge | Dual Kicker Solo-Baric L7R 10

Dual 10" Sealed Wedge Enclosure | Dual-Chamber Behind-Seat Design for the Kicker Solo-Baric L7R 10

1.44 ft³ Net Total0.72 ft³ Per ChamberButterworth Both Coils14.35" DeepDual ChamberBuilt in Tennessee

Two Isolated Chambers, Both on Butterworth

Two fully isolated chambers of 0.82 cubic feet gross each, one driver per chamber, sharing a common cabinet and one terminal cup. Each driver sees exactly the airspace it was solved for, and neither can modulate the other through a shared volume.

0.82 cu ft gross per chamber, in the middle of Kicker's published 0.66 to 1.00 cu ft sealed window, and roughly 0.72 cu ft net once the driver is in. The dual 2-ohm 45L7R102 lands at Qtc 0.705 and the dual 4-ohm 45L7R104 at Qtc 0.710. Both sit on the 0.707 Butterworth point, the maximally flat sealed alignment, from one cabinet.

Why Two Chambers Instead of One

A shared volume lets each cone's back pressure act on the other, so any mismatch in the pair, from build tolerance, break-in, or a failing driver, gets shared across both. Isolated chambers keep each driver honest.

Full-Height Dado Divider

A 3/4" divider locked into dados top, bottom, front and back. It seals the two chambers and doubles as the primary brace across the 29.75" span.

20° Raked Baffle

Matches the lean of most factory seat backs and fires both L7Rs forward into the cabin instead of into the seat.

Vertical Rear Panel

Sits flush against the cab back wall or trunk bulkhead, so the full footprint of the box goes to airspace.

One Shared Terminal Cup

A single side-mounted cup feeds both chambers with 12 gauge OFC, so you make one connection instead of two.

Shallower Than the Cabinet It Replaces

The L7R 10 needs only 6-1/8" of mounting depth, so this cabinet was re-solved around the shallower driver rather than inheriting the depth our SoloX wedge needs for its 9-7/16" motor. Some of the airspace moved sideways into width, bringing the floor depth down to 14.35" while keeping the overall width at 29.75", which still fits a crew cab back wall.

Alignment Numbers, Per Chamber

Dual 2-Ohm (45L7R102): Qtc 0.705 · Fc 51.1 Hz · F3 51.2 Hz — Dual 4-Ohm (45L7R104): Qtc 0.710 · Fc 53.8 Hz · F3 53.6 Hz

Mounting Geometry

Both baffle openings are CNC-cut to 9-5/16" square (Kicker spec, shared with the SoloX 10 and L7S 10). Each chamber gives the motor well over the 6-1/8" it needs. 8/32 threaded inserts pressed into the baffle backside at both positions.

Sealed Alignment Response

Predicted anechoic response of the Solo-Baric L7R 10 in one chamber, computed from Kicker's published Klippel T/S parameters. This enclosure ships without drivers, so both coil variants are plotted. Note how tightly the two traces track each other, and how flat both run down to the knee.

The dashed line marks the half-power point. Roll-off below F3 is the gentle 12 dB/octave slope characteristic of sealed alignments, which cabin gain in a real vehicle substantially fills in. Run the numbers yourself with our sealed box calculator.

Excursion Headroom You Cannot Run Out Of

Each L7R 10 is rated at 500 watts RMS, about 1000 for the pair. In this airspace it takes roughly 1394 watts per driver to reach the 16.75 mm linear limit, and about 1814 watts behind a 25 Hz subsonic filter. Thermal rating runs out at well under half that, so you cannot mechanically over-drive this combination on the power Kicker rates it for.

Performance Series Construction, Driver-Specific Tuning

Langboard Elite MDF

Premium 3/4" MDF panels milled to documented spec.

V-Groove and Dado Joinery

CNC-cut V-grooves at every panel intersection. Dado joints lock the raked baffle, vertical rear panel, and center divider into the side walls.

Double-Layer 1.5" Front Baffle

Two bonded 3/4" MDF sheets plus a trim layer across both driver positions. The square L7R frame loads its flange hard at the corners; this baffle does not flex.

Pre-Wired Terminal Cup

One Proline X ABS/carbon-fiber composite terminal cup, side-mounted, 12 gauge OFC pre-wired to both chambers.

Finish and Trim

Plush Black Carpet

Every enclosure ships wrapped in plush black automotive carpet, the standard finish for the PO Wedge line.

Black Acrylic Insert

The signature Proline X acrylic insert comes in black.

Box-Only

This listing is box-only. Bring your own pair of Solo-Baric L7R 10s.

Wiring a Pair of Solo-Baric L7R 10s

Kicker rates each L7R 10 at 500 watts RMS, so a matched pair wants roughly 1000 watts RMS total. Run matching coil versions in both chambers. A pair of dual 2-ohm drivers gives you 0.5, 2, or 8 ohm system options; a pair of dual 4-ohm gives 1, 4, or 16. Because both versions land on Butterworth, choose purely on amplifier match.

Built in Tennessee, Backed by Audio Intensity

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

Dual Solo-Baric L7R 10: Twice the Output, Same Butterworth Alignment

Two isolated 0.82 cubic foot chambers, solved from Kicker's Klippel data. Both coil versions on the flattest sealed alignment there is, in a wedge built for behind the seat.

Specifications

Series	Proline X Performance Optimized Wedge
Compatible Drivers	Two Kicker Solo-Baric L7R 10 (45L7R102 Dual 2-Ohm / 45L7R104 Dual 4-Ohm)
Enclosure Type	Sealed \| Dual Driver, Dual Chamber \| Front-Firing Wedge
Wedge Angle	20 Degrees, Vertical Rear Panel
External Width	29.75 Inches
External Height	13.5 Inches
External Depth (Top)	9.47 Inches
External Depth (Bottom)	14.35 Inches
Gross Volume Per Chamber	0.82 Cubic Feet
Net Volume Per Chamber	Approx 0.72 Cubic Feet
Net Volume Total	Approx 1.44 Cubic Feet
Kicker Published Sealed Window	0.66 to 1.00 Cubic Feet Internal Per Driver
System Qtc (Dual 2-Ohm)	0.705 Butterworth
System Qtc (Dual 4-Ohm)	0.710 Butterworth
Predicted Fc	51.1 Hz (D2) / 53.8 Hz (D4)
Predicted F3 (Anechoic)	51.2 Hz (D2) / 53.6 Hz (D4)
Driver Fs (D2 / D4)	31.10 Hz / 32.05 Hz (Kicker Klippel)
Driver Qts (D2 / D4)	0.4295 / 0.4230 (Kicker Klippel)
Driver Qes (D2 / D4)	0.455 / 0.450 (Kicker Klippel)
Driver Vas (D2 / D4)	34.574 L / 37.022 L (Kicker Klippel)
Driver Bl (D2 / D4)	17.319 Tm / 23.104 Tm
Driver Mms (D2 / D4)	200.84 g / 176.05 g
Driver Sd	432.64 cm² Each
Driver Xmax	16.75 mm One-Way
Woofer Cutout	9-5/16 Inches Square, Both Positions (Kicker Spec)
Mounting Depth Required	6-1/8 Inches, Cleared With Margin
Recommended Power	500 Watts RMS Each, 1000 Watts System (Kicker Rating)
Material	Langboard Elite 3/4" MDF
Construction	ShopSabre CNC \| V-Groove and Dado Joinery
Panel Thickness	3/4 Inch
Front Baffle	Double-Layer 1.5" MDF Plus Trim Layer
Internal Bracing	Full-Height 3/4" Dado-Locked Center Divider
Driver Mounting	8/32 Threaded Inserts \| Stainless Machine Screws Included
Terminal Cup	One Shared Proline X ABS/Carbon Fiber Composite \| Side Mounted
Internal Wiring	12 Gauge OFC, Pre-Wired to Both Chambers
Finish	Plush Black Carpet \| Black Acrylic Insert
Bundle Options	Enclosure Only (Bring Your Own Pair of L7R 10s)
Warranty	1-Year Limited (Enclosure)
Built In	Tullahoma, Tennessee, USA

Performance Graphs

Net airspace

0.72

cu ft per chamber

System Qtc

0.71

sealed

Half power

51.2–53.6

Hz · F3

Xmax at

719

W RMS · no filter

With 25 Hz subsonic

911

W RMS · +27%

Amplifier

500

W RMS recommended

This enclosure holds 0.72 cu ft net per chamber. In it the Kicker Solo-Baric L7R 10 (45L7R102) runs a system Qtc of 0.71 with half power at 51.2–53.6 Hz, and the cone reaches its 16.75 mm travel limit at 719 W, above the driver’s 500 W thermal rating, so heat stops you before travel does. Run a subsonic filter at 25 Hz and that becomes 911 W — +192 W, or 27 percent more power for the same 16.75 mm of travel.

01Is it a sealed driver?

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

EBP = Fs ÷ Qes = 68.4–71.2

D2 · EBP 68.4D4 · EBP 71.2

At 68.4–71.2 the Solo-Baric L7R 10 (45L7R102) 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

0.72 cu ft against a 34.6 L Vas.

α = Vas ÷ Vb = 1.70 · Fc = Fs√(α+1) = 51–54 Hz · Qtc = 0.71

D2 · Qtc 0.71, Fc 51 Hz, F3 51.2 HzD4 · Qtc 0.71, Fc 54 Hz, F3 53.6 Hz

The box lifts resonance from 31.1–32.0 Hz free-air to 51–54 Hz and half power lands at 51.2–53.6 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 16.75 mm — and a bigger one once a subsonic filter stops it wasting travel below the passband.

P_Xmax = 719–741 W unfiltered → 911–914 W with a 25 Hz subsonic

D2 · 719 W, no filterD4 · 741 W, no filterD2 · 914 W with subsonic at 25 Hz, 24 dB/octD4 · 911 W with subsonic at 25 Hz, 24 dB/octXmax 16.75 mm one-way

Every trace touches the limit and no further, because each is drawn at the exact power that puts that coil on 16.75 mm. Unfiltered that is 719 W, reached first at 20 Hz. It sits above the 500 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 911 W before hitting the same 16.75 mm. That is 27 percent more amplifier for the price of one filter setting.

Param	Value	Unit	Note
Fs	31.10 / 32.05	Hz	free-air resonance
Qts	0.429 / 0.423		D2 / D4
Vas	34.57 / 37.02	L	equivalent compliance
Sd	432.6	cm²	effective piston area
Xmax	16.75	mm	one-way linear travel
Pe	500	W	continuous RMS
SPL	85.4	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.