Performance Optimized · Datasheet

Performance Optimized Wedge Enclosure | Fits Triple Kicker Solo X 8" Subwoofers Triple 8" Sealed enclosure

Net volume
0.51 Cubic Feet
Max mounting depth
7-15/16 Inches, Cleared With Margin
Cutout
7-5/16 Inches (Kicker Spec)
External dimensions
32 Inches W × 11.75 Inches H × 11.75 Inches / 16 Inches D
Front baffle
Double-Layer 1.5" MDF Plus Trim Layer
Buy at Audio Intensity
  • Alignment: Three identical sealed chambers, 0.51 cu ft net each (1.53 total). Dual 1-ohm 49L7X81s land at Qtc 0.707 (true Butterworth) per chamber, Fc 54 Hz, F3 54 Hz; dual 2-ohm 49L7X82s run Qtc 0.74, F3 52.2 Hz
  • Chambers: Two full-height 3/4 in dado-locked dividers, one driver per chamber, doubling as bracing across the 32 in span. Slightly deeper profile than the single and dual 8s to hold chamber volume
  • Drivers: Three matched Kicker Solo X L7X 8s. Each opening CNC-cut to 7-5/16 in per Kicker spec, 7-15/16 in depth cleared
  • Wiring: One shared side-mounted terminal cup, 12 gauge OFC to all three positions. Kicker recommends 400-800 watts RMS per driver, 1200-2400 system
  • Cabinet: 32 in W x 11.75 in H x 11.75/16 in D, 3/4 in Langboard Elite MDF, 1.5 in double baffle plus trim, plush black carpet with black acrylic insert

Technical specifications

SeriesProline X Performance Optimized Wedge
Compatible DriverKicker Solo X L7X 8 (49L7X81 / 49L7X82) | Three Required
Enclosure TypeSealed | Triple Driver | Front-Firing Wedge
Chamber ConfigurationThree Identical Sealed Chambers | Two Full 3/4" Dividers | Single Shared Side-Mounted Terminal Cup
Wedge Angle20 Degrees, Vertical Rear Panel
External Width32 Inches
External Height11.75 Inches
External Depth (Top)11.75 Inches
External Depth (Bottom)16 Inches
Total Internal Gross Volume1.83 Cubic Feet
Per-Chamber Net Volume0.51 Cubic Feet
Total Net Volume1.53 Cubic Feet
System Qtc Per Chamber (Dual 1-Ohm)0.707 Butterworth
System Qtc Per Chamber (Dual 2-Ohm)0.74
Predicted Fc Per Driver54 Hz (D1) / 54 Hz (D2)
Predicted F3 Per Driver (Anechoic)54 Hz (D1) / 52.2 Hz (D2)
Driver Fs (D1 / D2)48.0 Hz / 47.95 Hz (Kicker Factory)
Driver Qts (D1 / D2)0.630 / 0.651 (Kicker Factory)
Driver Vas (D1 / D2)3.75 L / 4.13 L (Kicker Factory)
Woofer Cutout (Each)7-5/16 Inches (Kicker Spec)
Mounting Depth Required (Each)7-15/16 Inches, Cleared With Margin
Recommended Power Per Driver400-800 Watts RMS (Kicker Recommendation)
Recommended System Power1200-2400 Watts RMS Across The Trio
MaterialLangboard Elite 3/4" MDF
ConstructionShopSabre CNC | V-Groove and Dado Joinery
Panel Thickness3/4 Inch
Front BaffleDouble-Layer 1.5" MDF Plus Trim Layer
Chamber DividersTwo 3/4" MDF Full-Height, Dado-Locked, Double As Braces
Driver Mounting8/32 Threaded Inserts | Stainless Machine Screws Included | 3 Sets
Terminal CupOne Proline X ABS/Carbon Fiber Composite | Side Mounted | Serves All Three Chambers
Internal Wiring12 Gauge OFC, Pre-Wired To All Three Driver Positions
FinishPlush Black Carpet | Black Acrylic Insert
Bundle OptionsEnclosure Only (Bring Your Own Trio of Solo X 8s)
Warranty1-Year Limited (Enclosure)
Built InTullahoma, Tennessee, USA

Performance in this enclosure

Net airspace
0.51
cu ft per chamber
System Qtc
0.71–0.74
sealed
Half power
52.2–53.8
Hz · F3
Xmax at
2371
W RMS · no filter
With 25 Hz subsonic
2804
W RMS · +18%
Amplifier
400–800
W RMS recommended
This enclosure holds 0.51 cu ft net per chamber. In it the Kicker SoloX L7X 8 (49L7X81) runs a system Qtc of 0.71–0.74 with half power at 52.2–53.8 Hz, and the cone reaches its 24.0 mm travel limit at 2371 W, above the driver’s 800 W thermal rating, so heat stops you before travel does. Run a subsonic filter at 25 Hz and that becomes 2804 W — +433 W, or 18 percent more power for the same 24.0 mm of travel.

01Is it a sealed driver?

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

EBP = Fs ÷ Qes = 62.3–65.3
SEALED 0–50 TRANSITION 50–100 PORTED 100–150 0 50 100 150 D1 65.3 D2 62.3
D1 · EBP 65.3D2 · EBP 62.3
At 62.3–65.3 the SoloX L7X 8 (49L7X81) 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

0.51 cu ft against a 3.8 L Vas.

α = Vas ÷ Vb = 0.26  ·  Fc = Fs√(α+1) = 54 Hz  ·  Qtc = 0.71–0.74
20 30 50 70 100 150 200 +6 +0 -6 -12 -18 -24 FREQUENCY · Hz LEVEL · dB −3 dB
D1 · Qtc 0.71, Fc 54 Hz, F3 53.8 HzD2 · Qtc 0.74, Fc 54 Hz, F3 52.2 Hz
The box lifts resonance from 48.0 Hz free-air to 54 Hz and half power lands at 52.2–53.8 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 24.0 mm — and a bigger one once a subsonic filter stops it wasting travel below the passband.

PXmax = 2371–2450 W unfiltered  →  2804–3018 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 24.0 mm 2371 W reaches Xmax here
D1 · 2450 W, no filterD2 · 2371 W, no filterD1 · 3018 W with subsonic at 25 Hz, 24 dB/octD2 · 2804 W with subsonic at 25 Hz, 24 dB/octXmax 24.0 mm one-way
Every trace touches the limit and no further, because each is drawn at the exact power that puts that coil on 24.0 mm. Unfiltered that is 2371 W, reached first at 20 Hz. It sits above the 800 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 2804 W before hitting the same 24.0 mm. That is 18 percent more amplifier for the price of one filter setting.
ParamValueUnitNote
Fs48.00 / 47.95Hzfree-air resonance
Qts0.631 / 0.651D1 / D2
Vas3.75 / 4.13Lequivalent compliance
Sd249.6cm²effective piston area
Xmax24mmone-way linear travel
Pe800Wcontinuous RMS
SPL79.4dB1 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

Three Butterworth 8s across one baffle is 12-inch cone area with 8-inch physics: light cones, big combined motor force, and a cabinet that never grows past 11.75 inches tall. Each driver owns an identical 0.51 cubic foot chamber at Qtc 0.707, so the trio moves as one driver with triple the displacement. This is the show-off piece of the 8 family and the loudest small-driver wedge we make.

Notice the profile: the triple runs 11.75 inches of top depth and 16 at the floor, a step deeper than its single and dual siblings. That is deliberate. At 32 inches wide with two dividers eating internal width, depth is where we recovered the airspace to keep every chamber at the full 0.51 net. Nothing about the alignment was compromised to hit the width.

Buy three identical drivers and wire all three the same off the shared cup. With three positions in play, wiring math matters more than usual: three dual 1-ohm drivers land at 0.67 or 6 ohms in the common configurations, while three dual 2-ohm drivers give you 1.33 ohms with everything in parallel. Map your amplifier's stable loads before choosing coils.

Plan 1200-2400 clean watts across the set, 400-800 per driver per Kicker. Fit check before ordering: 32 inches of width is real estate; measure between seat-belt towers and door trim, and confirm 16 inches of floor depth with the seat where you actually keep it, not slid full forward.

Questions

Will my Kicker Solo X 8s fit this enclosure?

Yes. Each of the three baffle openings is CNC-cut to Kicker's published 7-5/16 inch cutout for the Solo X L7X 8, and every chamber clears the required 7-15/16 inch mounting depth with margin, including breathing room for the vented motors. Both coil versions fit; use three matched drivers.

Why is the triple 8 deeper than the single and dual 8 wedges?

Because chamber volume is non-negotiable. At 32 inches wide, the two internal dividers consume width that would otherwise be airspace, so the triple carries a slightly deeper profile, 11.75 inches at the top and 16 at the floor, to keep every chamber at the same 0.51 net cubic feet the single and dual use. Same Butterworth alignment per driver, just packaged to hold it three times over.

Do all three subwoofers need to be the same coil version?

Yes, all three must match. The chambers are identical, so identical drivers wired identically share power evenly and stay in phase lockstep. Mixing coil versions off the single shared cup creates unequal branch impedances, splits power unevenly, and unbalances the set. Choose the coil version whose three-driver wiring lands at a load your amplifier is stable into: three dual 1-ohm drivers commonly net 0.67 or 6 ohms, three dual 2-ohm drivers net 1.33 ohms fully parallel.

How much power should I run to three Solo X 8s?

Kicker recommends 400-800 watts RMS per Solo X 8, so plan 1200-2400 watts RMS of clean power across the trio at your wired impedance. The sealed chambers keep all three cones controlled as level climbs, so the top of that range is usable with properly set gains. One strong monoblock feeding the shared cup keeps the system simple.

How do three 8s compare to a single 12 or 15?

Three 8s roughly match a 12 in cone area while spreading it across lighter, faster cones, and the cabinet stays 11.75 inches tall where our 12 wedge stands 15.25 and the 15 stands 18.25. The big singles still dig deeper anechoically with their lower F3s. The trio answers with transient speed, a wall-of-cone visual, and a height that works behind seats the big boxes cannot. If depth below 40 Hz is the priority, look at the 15 or 18; if speed, fit, and impact are, this is the one.

Will this wedge fit behind the seat of my truck?

You need 32 inches of width, 11.75 inches of height, and 16 inches of depth at the floor; the top needs only 11.75 inches thanks to the 20 degree baffle rake, and the vertical rear panel sits flat against the cab wall. The height is friendly, the width is the thing to verify: measure the clear span behind your seat between belt towers and trim before ordering.

Are the subwoofers included with this enclosure?

No, this listing is the enclosure only. It is built for three matched Kicker Solo X L7X 8s, which you install using the pressed 8/32 threaded inserts and the three sets of included stainless mounting hardware. If you want help sourcing a trio of Solo X 8s or matching an amplifier, call us at 931-563-5151.

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