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Proline X PO 10D-S DFW EVL10 sealed down-fire wide enclosure for two Skar Audio EVL-10, 41 inches wide by 8.75 inches tall, feet add 1.75 inches of height.
Proline X PO 10D-S DFW EVL10 sealed down-fire wide enclosure, end panel with side-mounted terminal cup, 8.75 inches tall by 12 inches deep.

Performance Optimized · Datasheet

Performance Optimized Down Fire Wide Sealed Dual 10" Enclosure Skar Audio EVL-10 · Dual 10" Sealed enclosure

Net volume
0.653 cu ft per chamber, 1.307 cu ft total, after the divider and an estimated 0.092 cu ft displacement per driver
Max mounting depth
7.16 in required, 0.84 in clearance above the motor
External dimensions
41 in W × 8.75 in in the down fire position H × 12 in D
Front baffle
1.5 in double baffle, outer layer machined as a flush recess
Buy at Audio IntensityFactory-direct, ships from Tullahoma
Skar Audio EVL-10Buy at Audio Intensity
  • Alignment: 0.653 cu ft net per chamber. D2: Qtc 0.690, Fc 51.5 Hz, F3 52.8 Hz. D4: Qtc 0.721, Fc 52.3 Hz, F3 51.3 Hz
  • Down Fire Wide: 41"W x 12"D x 8.75"H in down fire position, excludes standoffs, sized for under the rear seat of a truck or SUV
  • Drivers: Pair of Skar Audio EVL-10 (D2 or D4), 1000 W RMS each, 23.5 mm Xmax, 7.16 in mounting depth
  • Chambers: Two fully separate sealed chambers, 3/4" MDF full divider, one shared side-mounted terminal cup
  • Standoffs: Included, 1.75 in, shipped uninstalled. Installed height 10.5 in

Spec of record

Technical specifications

SpecificationValue
SeriesProline X Performance Optimized Down Fire Wide
Compatible DriverSkar Audio EVL-10 D2 or D4, quantity 2. Direct fit
ConfigurationDual 10 inch, two separate chambers, sealed down fire
Mounting PositionUnder the rear seat of trucks and SUVs, or a narrow cargo floor, baffle facing down on standoffs
Firing DirectionDownward. Standoffs ship uninstalled, so front or up firing is also possible
External Width41 in
External Depth12 in
External Height8.75 in in the down fire position, excludes standoffs
Installed Height10.5 in including the 1.75 in standoff
Internal Volume, Gross1.521 cu ft total
Internal Volume, Net Acoustic0.653 cu ft per chamber, 1.307 cu ft total, after the divider and an estimated 0.092 cu ft displacement per driver
Height Set ByAirspace; clearance alone would allow a lower cabinet
Driver Mounting Depth7.16 in required, 0.84 in clearance above the motor
Alignment per chamber, D2Qtc 0.690, Fc 51.5 Hz, F3 52.8 Hz anechoic
Alignment per chamber, D4Qtc 0.721, Fc 52.3 Hz, F3 51.3 Hz anechoic
Comparison, Standard 30x1530.00 x 15.00 x 9.35 in, built to 0.65 cu ft net per chamber
Skar Recommended Sealed1.25 to 1.5, cubic feet net of driver, bracing and port
Woofer Opening9.39 in, Skar's published cutout
Frame Outer Diameter10.89 in
Bolt CircleNot printed by Skar; threaded insert kit included
Driver Displacement0.092 cu ft, estimated; Skar publishes none
D2 Fs / Qts / Qes / Qms / Vas44.0 Hz / 0.59 / 0.66 / 5.44 / 6.8 L
D4 Fs / Qts / Qes / Qms / Vas45.0 Hz / 0.62 / 0.69 / 5.21 / 6.5 L
Driver Sd314 cm2, published by Skar
Xmax23.5 mm one way, Skar spec
Driver Power Handling1000 W RMS each, Skar spec
Wiring OptionsPair of D2: 0.5, 2 or 8 ohm. Pair of D4: 1, 4 or 16 ohm. Series wiring is the safe default
Parameter Sourceskaraudio.com EVL-10 product page, T/S Parameters and Subwoofer Measurements
MaterialLangboard Elite MDF
ConstructionCNC cut, V-groove and dado joinery, square corners
Panel Thickness0.75 in
Front Baffle1.5 in double baffle, outer layer machined as a flush recess
Internal BracingFull-height 3/4 in divider
Driver MountingThreaded insert kit included, NOT pre-installed: Skar prints no bolt circle
Terminal CupsOne Proline X ABS and carbon fiber composite, side mounted, pre wired 12 gauge OFC to both driver positions
StandoffsIncluded, 1.75 in, shipped uninstalled
DampingLight polyfill wall lining in both chambers, does not alter acoustic volume
CarpetPlush black
Warranty1 Year Limited
Built InTullahoma, Tennessee

Modelled response

Performance in this enclosure

Net airspace
0.653
cu ft per chamber
System Qtc
0.69–0.72
sealed
Half power
51.3–52.8
Hz · F3
Xmax at
2028
W RMS · no filter
With 25 Hz subsonic
2617
W RMS · +29%
Amplifier
1000
W RMS recommended
This enclosure holds 0.653 cu ft net per chamber. In it the Skar Audio EVL-10 runs a system Qtc of 0.69–0.72 with half power at 51.3–52.8 Hz, and the cone reaches its 23.5 mm travel limit at 2028 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 2617 W — +589 W, or 29 percent more power for the same 23.5 mm of travel.

01Is it a sealed driver?

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

EBP = Fs ÷ Qes = 65.2–66.7
SEALED 0–50 TRANSITION 50–100 PORTED 100–150 0 50 100 150 dual 2 ohm 66.7 dual 4 ohm 65.2
dual 2 ohm · EBP 66.7dual 4 ohm · EBP 65.2
At 65.2–66.7 the EVL-10 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

0.653 cu ft against a 6.8 L Vas.

α = Vas ÷ Vb = 0.37  ·  Fc = Fs√(α+1) = 51–52 Hz  ·  Qtc = 0.69–0.72
20 30 50 70 100 150 200 +6 +0 -6 -12 -18 -24 FREQUENCY · Hz LEVEL · dB −3 dB
dual 2 ohm · Qtc 0.69, Fc 51 Hz, F3 52.8 Hzdual 4 ohm · Qtc 0.72, Fc 52 Hz, F3 51.3 Hz
The box lifts resonance from 44.0–45.0 Hz free-air to 51–52 Hz and half power lands at 51.3–52.8 Hz, anechoic, before any cabin gain. Figures are Skar Audio’s published EVL-10 parameters from its product page. Driver displacement is not published; 0.092 cubic feet is an estimate. One cabinet serves both coils; both are plotted. Each chamber holds 0.653 cubic feet, so these figures are per driver.

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

PXmax = 2028–2156 W unfiltered  →  2617–2656 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 23.5 mm 2028 W reaches Xmax here
dual 2 ohm · 2028 W, no filterdual 4 ohm · 2156 W, no filterdual 2 ohm · 2617 W with subsonic at 25 Hz, 24 dB/octdual 4 ohm · 2656 W with subsonic at 25 Hz, 24 dB/octXmax 23.5 mm one-way
Every trace touches the limit and no further, because each is drawn at the exact power that puts that coil on 23.5 mm. Unfiltered that is 2028 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 2617 W before hitting the same 23.5 mm. That is 29 percent more amplifier for the price of one filter setting.
ParamValueUnitNote
Fs44.00 / 45.00Hzfree-air resonance
Qts0.590 / 0.620dual 2 ohm / dual 4 ohm
Vas6.80 / 6.50Lequivalent compliance
Sd314.1cm²effective piston area
Xmax23.5mmone-way linear travel
Pe1000Wcontinuous RMS
SPL81.3dB1 W / 1 m, derived from T/S

Driver parameters as published by Skar Audio EVL-10 product page. Curves computed against this enclosure’s actual net airspace.

From the shop floor

Installer's take

Measure the installed height, not the cabinet height. The box is 8.75 tall on its own and the standoffs add 1.75, so plan around 10.5 inches of stack on the 41 by 12 footprint.

Airspace set the height here, 0.653 cubic feet per chamber, the same as the standard 30 by 15 dual. The motors clear the lid with 0.84 to spare. D2 reads Qtc 0.690, D4 reads 0.721.

Cut is 9.39, Skar's own figure. Inserts ship in the kit, not pressed: Skar prints no bolt circle. Mark from the driver, drill, press. It is sealed, so leave the polyfill as it is and run it at 1000 watts or under per driver.

Before you order

Questions

Why is this dual cabinet 41 inches wide instead of 30?

Because it is only 12 inches deep. The standard Performance Optimized Down Fire cabinet for the Skar Audio EVL-10 is 30 wide by 15 deep, and this version is for spaces 3 inches shallower than that, under a rear bench or on a narrow cargo floor.

Airspace has to come from somewhere. Losing depth means recovering it along the length, so the cabinet runs 41 inches long and stands 8.75 inches tall. If you have 15 inches of depth, the standard cabinet is shorter in length and is the better pick; if you have 12 inches of depth and 41 inches of run, this is the shape that works.

How does this compare to the standard 30 x 15 Skar Audio EVL-10 enclosure?

Same driver, different shape. The standard cabinet is 30 by 15 by 9.35 inches and was built to 0.65 cubic feet net per chamber. This cabinet is 41 by 12 by 8.75 inches and holds 0.653 cubic feet net per chamber.

The airspace is essentially the same, within about a hundredth of a cubic foot, so the two behave the same way. The choice is about the space you have: the standard box is deeper and shorter in length, this one is long and shallow.

Does this fit the Skar EVL-10, and will any other 10 inch fit?

The EVL-10, yes, in either coil. The baffle is cut to 9.39 in, Skar's published cutout, under the 10.89 in frame, and the 7.16 inch motor clears the top panel with 0.84 inch to spare. Run two of the same coil so the chambers match.

Any other 10, no. The airspace is worked out from the EVL-10's own Qts and Vas, and a different woofer that happened to drop into the hole would not see the alignment printed on this page.

Why 0.653 cubic feet per chamber, and what alignment does it give?

The chamber matches the 0.65 per chamber of our standard dual and sits between the two coils' flat-alignment volumes, so the D2 lands just under the 0.707 reference and the D4 just over it.

The EVL-10 D2 reads Qtc 0.690, Fc 51.5 Hz, F3 52.8 Hz and the D4 reads Qtc 0.721, Fc 52.3 Hz, F3 51.3 Hz per chamber. Skar's numbers are the only published source for this driver, so treat the Qtc as good to a few hundredths.

What amplifier power should I run, and how should I wire it?

Skar rates the EVL-10 at 1000 watts RMS per driver. A pair of D2 drivers can land on 0.5 ohm with all four coils in parallel, 2 ohms as series pairs in parallel, or 8 ohms all in series; a pair of D4 drivers on 1, 4 or 16 ohms the same ways. Anything under 1 ohm is outside what most amplifiers are built for, so series wiring is the safe default. Confirm your amplifier's minimum stable impedance first.

How tall is this once the standoffs are on?

The cabinet is 8.75 inches tall measured in the down fire position, and that figure excludes the standoffs. The standoffs hold 1.75 inches under the baffle, so plan your space around a finished stack of 10.5 inches on a 41 by 12 inch footprint.

Do I need to add polyfill or damping?

No. Polyfill is already installed in both chambers as a light wall lining to control internal reflections, and the quantity is chosen so it does not change the acoustic volume. Do not add more: packing a sealed box with fill makes it behave as though it were larger, which walks the alignment away from the 0.653 cubic feet per chamber this cabinet was built to.

Is the driver included, and are the threaded inserts installed?

No driver. This is an enclosure only. You receive the cabinet finished in plush black carpet, one side-mounted pre-wired terminal cup, the polyfill lining already in place, the standoffs, and a threaded insert kit with stainless machine screws.

The inserts ship loose on purpose: Skar prints no bolt circle for the EVL-10, so you set the driver in the recess, mark its holes, drill and press the inserts. Bring your own pair of EVL-10.

Same series, same size

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