Proline X

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

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

Yes. The baffle is CNC-cut to Kicker's published 9-5/16 inch square cutout for the Solo-Baric L7R 10, and the cabinet 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: Does one box really work for both the dual 2-ohm and dual 4-ohm version?

It genuinely does, and that is unusual. Most drivers offer coil versions with meaningfully different Vas or Qts, so one cabinet ends up compromising for one of them. The L7R 10 does not: in this airspace the dual 2-ohm lands at Qtc 0.705 and the dual 4-ohm at 0.710, both sitting on the 0.707 Butterworth point. That five-thousandths difference is smaller than the variation you get from normal build tolerance and driver break-in, so neither version is being short-changed. Choose your coil purely on what your amplifier wants to see.

Q: Why is this box wider and shallower than your other 10" wedges?

Because the L7R only needs 6-1/8 inches of mounting depth, and a box should be shaped around the driver going into it rather than inherited from a different one. Our SoloX 10 wedge is 16.25 inches deep because that driver's motor needs 9-7/16 inches. Building the L7R in that same cabinet would have wasted three and a half inches of cab space for no acoustic gain.So the airspace was moved sideways instead of backward. At a fixed volume, depth and width trade directly against each other, and depth is almost always the dimension that decides whether a box fits behind a seat while width usually has room to spare. Going from 14.75 to 18.75 inches wide bought back 3.55 inches of depth. The alignment is identical either way; only the shape changed.

Q: Should I build this sealed or ported?

The L7R 10's efficiency bandwidth product is 68.4 for the dual 2-ohm and 71.2 for the dual 4-ohm, which puts it squarely in the transition band rather than the sealed band or the ported band. That is not a mismatch, it means the motor genuinely works either way and the choice is yours to make on priorities.Sealed buys you a much smaller box, a gentle 12 dB per octave roll-off that vehicle cabin gain fills in well, better transient behavior, and far more forgiving placement. Ported buys you more output in a narrow band around tuning at the cost of roughly double the airspace and a steeper cutoff below it. For a behind-seat truck install where space is the binding constraint, sealed is the right call, and that is why this enclosure exists.

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

You need 14.75 inches of width, 13.5 inches of height, and 16.25 inches of depth at the floor; the top of the box needs only 11.375 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. This is a compact single-driver footprint that fits behind the seat in most extended and crew cab trucks. Measure your seat track before ordering.

Q: Is the subwoofer included with this enclosure?

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

SKU: PO 10-S W L7R

QUICK SPECS

Alignment: 0.82 cu ft gross sealed wedge (about 0.72 net), Butterworth on both coils. Dual 2-ohm 45L7R102 runs Qtc 0.705, Fc 51.1 Hz, F3 51.2 Hz; dual 4-ohm 45L7R104 runs Qtc 0.710, Fc 53.8 Hz, F3 53.6 Hz
Geometry: 20° front-firing wedge, vertical rear panel. 18.75 in W x 13.5 in H x 7.83 in top / 12.7 in bottom depth, only 12.7 in at the floor
Driver: Kicker Solo-Baric L7R 10 (either coil version). Baffle CNC-cut to 9-5/16 in square per Kicker spec; motor gets about 6.6 in against the 6-1/8 in it needs
Wiring: One side-mounted terminal cup, 12 gauge OFC pre-wired. Kicker rates 500 W RMS / 1000 W peak; about 1394 W would be needed to reach Xmax here, so thermal limits arrive first
Cabinet: 3/4 in Langboard Elite MDF, 1.5 in double-layer baffle plus trim, dado-locked brace behind the woofer, 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.

$ 249.99

In Stock and Ready to Ship

Financing available. Choose Shop Pay Installments at checkout.

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

$ 249.99

Enclosure Type Sealed

External Dimensions 18.75" W x 13.5" H x 7.83" top / 12.7" bottom D (20° wedge)

Net Volume 0.72 net / 0.82 grosscu ft

Tuning Frequency N/A (Sealed)

Cutout Diameter Direct Fit

Front Panel Thickness 1.5"

Max Mounting Depth Direct Fit

INSTALLER'S TAKE

The L7R 10 is the easiest driver in the Kicker square-sub lineup to build a sealed box for, and I mean that as a compliment. Qts in the low 0.43 range against a Vas just over a cubic foot is the combination that lets a sealed box land on Butterworth in a volume that actually fits in a truck. Half the L7 family will not do that. The 15s in this series need six to twelve cubic feet to get to the same place, which is why they are not in this line.

Both coil versions landing on the same alignment is the part I like most. Qtc 0.705 and 0.710 in the same cabinet is close enough that I would not tell you which one was in the box if you could not read the label. That almost never happens. Buy the coil that matches your amplifier and stop thinking about it.

Butterworth is the alignment people ask for by describing it rather than naming it. Flat with no bump at resonance, a soft 12 dB per octave knee, no overhang. In a cab the gain curve meets that roll-off on the way down and the in-vehicle response extends well below the low-50s F3 on the chart. It will not do what a ported box does in the low 30s, and it is not trying to.

The shape is deliberate. This driver only needs 6-1/8 inches of depth, so I put the volume into width and pulled three and a half inches out of the floor depth. 18.75 wide, 13.5 tall, 12.7 deep at the bottom. In most trucks the back wall has width to spare and the seat track does not, so this is the trade that actually gets the box in the vehicle. Power is a non-issue: rated at 500 watts, needs about 1400 to reach Xmax here, so the coil gives up long before the suspension does.

Product Details

Performance Optimized Wedge | Kicker Solo-Baric L7R 10

10" Sealed Wedge Enclosure | Shallow Behind-Seat Wedge for the Kicker Solo-Baric L7R 10

0.82 ft³ Gross0.72 ft³ NetButterworth Both CoilsOnly 12.7" DeepV-Groove / DadoBuilt in Tennessee

Butterworth on Both Coil Versions, From One Cabinet

The Solo-Baric L7R 10 is the rare driver where the two coil options load a sealed box almost identically. In this cabinet the dual 2-ohm 45L7R102 lands at Qtc 0.705 and the dual 4-ohm 45L7R104 at Qtc 0.710. Both are sitting on the 0.707 Butterworth point, and they differ from each other by five thousandths, which is well inside build tolerance.

0.82 cu ft gross internal airspace, which sits 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. Butterworth is the maximally flat sealed alignment: no peak at resonance, no dip before roll-off, and the flattest amplitude response a sealed box is capable of producing.

Built Shallow On Purpose

The L7R 10 needs only 6-1/8" of mounting depth. Rather than inherit the deep cabinet our SoloX wedge needs for its 9-7/16" motor, this box was re-solved around the shallower driver: the airspace moved sideways into width instead of backward into depth. The result is 12.7" at the floor instead of 16.25", a three and a half inch reduction in the dimension that actually decides whether a box fits behind your seat.

Vertical Rear Panel

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

20° Raked Baffle

Matches the lean of most factory seat backs and fires the L7R forward into the cabin instead of into the seat.

Dado-Locked Internal Brace

A 3/4" brace directly behind the woofer halves the largest panel span. Its depth matches the baffle stack, so driver clearance is engineered in, not left to luck.

Carpet-Wrap Ledge

A recessed perimeter ledge terminates the carpet cleanly at the baffle edge for a finished, factory look.

Engineered for the Kicker Solo-Baric L7R 10

Solved from Kicker's published Klippel T/S measurements rather than adapted from a generic 10" box. Butterworth is what most people actually want from a sealed sub and rarely get, because it requires the driver's Qts and Vas to cooperate with a box size that fits in a vehicle. On this driver they do.

Alignment Numbers

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

The baffle is CNC-cut to 9-5/16" square (Kicker spec, shared with the SoloX 10 and L7S 10). The cabinet gives the motor about 6.6" against the 6-1/8" it needs, so the vented back plate has breathing room. 8/32 threaded inserts pressed into the baffle backside.

Sealed Alignment Response

Predicted anechoic response of the Solo-Baric L7R 10 in this enclosure, computed from Kicker's published Klippel T/S parameters. This enclosure ships without a driver, 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

The L7R 10 is rated at 500 watts RMS. In this airspace it takes roughly 1394 watts to drive the cone to its 16.75 mm linear limit, and about 1814 watts behind a 25 Hz subsonic filter. The driver's thermal rating runs out at well under half that, which means you cannot mechanically over-drive this combination on the power Kicker rates it for. That is a comfortable place to be.

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 internal brace into the side walls.

Double-Layer 1.5" Front Baffle

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

Pre-Wired Terminal Cup

Proline X ABS/carbon-fiber composite terminal cup, side-mounted, with 12 gauge OFC pre-wired.

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 Solo-Baric L7R 10.

Wiring the Solo-Baric L7R 10 to Your Amplifier

Kicker rates the L7R 10 at 500 watts RMS and 1000 watts peak. Pick the coil version that wires to the impedance your amplifier makes clean power into: the dual 2-ohm wires to 1 or 4 ohms, the dual 4-ohm to 2 or 8. Because both versions land on Butterworth in this box, you can 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.

Kicker Solo-Baric L7R 10: Butterworth in a Shallow Behind-Seat Wedge

0.82 cubic feet gross, solved from Kicker's Klippel data. Both coil versions on the flattest sealed alignment there is, in a box only 12.7 inches deep.

Specifications

Series	Proline X Performance Optimized Wedge
Compatible Driver	Kicker Solo-Baric L7R 10 (45L7R102 Dual 2-Ohm / 45L7R104 Dual 4-Ohm)
Enclosure Type	Sealed \| Single Driver \| Front-Firing Wedge
Wedge Angle	20 Degrees, Vertical Rear Panel
External Width	18.75 Inches
External Height	13.5 Inches
External Depth (Top)	7.83 Inches
External Depth (Bottom)	12.7 Inches
Internal Gross Volume	0.82 Cubic Feet
Net Volume (After Driver Displacement)	Approx 0.72 Cubic Feet
Kicker Published Sealed Window	0.66 to 1.00 Cubic Feet Internal
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
Driver Xmax	16.75 mm One-Way
Woofer Cutout	9-5/16 Inches Square (Kicker Spec)
Mounting Depth Required	6-1/8 Inches \| Approx 6.6 Inches Available
Recommended Power	500 Watts RMS / 1000 Watts Peak (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	3/4" Dado-Locked Brace Behind Woofer
Driver Mounting	8/32 Threaded Inserts \| Stainless Machine Screws Included
Terminal Cup	One Proline X ABS/Carbon Fiber Composite \| Side Mounted
Internal Wiring	12 Gauge OFC, Pre-Wired
Finish	Plush Black Carpet \| Black Acrylic Insert
Bundle Options	Enclosure Only (Bring Your Own L7R 10)
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.