Shop
Proline X PO 10D-S DFW CLUB sealed down-fire wide enclosure for two JBL Club 102SL, 41 inches wide by 7.875 inches tall, feet add 1.75 inches of height.
Proline X PO 10D-S DFW CLUB sealed down-fire wide enclosure, end panel with side-mounted terminal cup, 7.875 inches tall by 12 inches deep.

Performance Optimized · Datasheet

Performance Optimized Down Fire Wide Sealed Dual 10" Shallow Sub Enclosure JBL Club 102SL · Dual 10" Sealed enclosure

Net volume
0.605 cu ft per chamber, 1.210 cu ft total, after the divider and an estimated 0.04 cu ft driver displacement per driver
Max mounting depth
3.25 in required, 3.875 in clearance above the motor
External dimensions
41 in W × 7.875 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
JBL Club 102SLBuy at Audio Intensity
  • Alignment: 0.605 cu ft net per chamber, Qtc 1.708 at 4 ohm, Fc 54.5 Hz, F3 37.4 Hz, +5 dB peak near 60 Hz. 2 ohm: Qtc 1.875, F3 37.8 Hz
  • Down Fire Wide: 41"W x 12"D x 7.875"H in down fire position, excludes standoffs, sized for under the rear seat of a truck or SUV
  • Drivers: Pair of JBL Club 102SL, 350 W RMS each, 3.25 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 9.625 in

Spec of record

Technical specifications

SpecificationValue
SeriesProline X Performance Optimized Down Fire Wide
Compatible DriverJBL Club 102SL, 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 Height7.875 in in the down fire position, excludes standoffs
Installed Height9.625 in including the 1.75 in standoff
Internal Volume, Gross1.316 cu ft total
Internal Volume, Net Acoustic0.605 cu ft per chamber, 1.210 cu ft total, after the divider and an estimated 0.04 cu ft driver displacement per driver
Height Set ByAirspace; clearance alone would allow a lower cabinet
Driver Mounting Depth3.25 in required, 3.875 in clearance above the motor
Alignment per chamber, SSI 4 ohmQtc 1.708, Fc 54.5 Hz, F3 37.4 Hz anechoic, peak +5.0 dB near 60 Hz
Alignment per chamber, SSI 2 ohmQtc 1.875, Fc 55.7 Hz, F3 37.8 Hz anechoic, peak +5.8 dB
Comparison, Standard 30x1530.00 x 15.00 x 8.37 in, built to 0.60 cu ft net per chamber. Same airspace, different shape
Woofer Opening9.00 in (228.6 mm), JBL spec, two
Frame Outer Diameter10.52 in (267.3 mm), JBL spec
Bolt CircleNot printed by JBL; threaded insert kit included
Driver DisplacementNot published by JBL; 0.04 cu ft estimated
Fs / Qts / Qes / Qms (4 ohm)35 Hz / 1.097 / 1.329 / 6.263
Fs / Qts / Qes / Qms (2 ohm)36.2 Hz / 1.218 / 1.401 / 9.325
Vas / Mms / Bl (4 ohm)24.4 L / 144 g / 10.37 T-m
Driver Sd346 cm2, JBL spec
Xmax6 mm, JBL spec
Driver Sensitivity81 dB at 1 W / 1 m, JBL manual
Driver Power Handling350 W RMS / 1050 W peak per driver
ImpedanceSingle voice coil, SSI switch-selectable 2 or 4 ohm; a pair at 4 ohm gives 2 ohm parallel at the cup
Parameter SourceJBL Club 102SL / 122SL owner's manual
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: JBL 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, enclosure
Built InTullahoma, Tennessee

Modelled response

Performance in this enclosure

Net airspace
0.605
cu ft per chamber
System Qtc
1.71–1.88
sealed
Half power
37.4–37.8
Hz · F3
Xmax at
62
W RMS · no filter
With 25 Hz subsonic
62
W RMS · +0%
Amplifier
350
W RMS recommended
This enclosure holds 0.605 cu ft net per chamber. In it the JBL Club 102SL runs a system Qtc of 1.71–1.88 with half power at 37.4–37.8 Hz, and the cone reaches its 6.0 mm travel limit at 62 W, below the driver’s 350 W thermal rating, so travel is what stops you here, not heat. A 25 Hz subsonic filter adds little here: 62 W against 62 W, 0 percent. The box already resonates at 54–56 Hz, so its own rolloff has removed most of what the filter would have stopped.

01Is it a sealed driver?

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

EBP = Fs ÷ Qes = 25.8–26.3
SEALED 0–50 TRANSITION 50–100 PORTED 100–150 0 50 100 150 SSI switch at 4 ohm 26.3 SSI switch at 2 ohm 25.8
SSI switch at 4 ohm · EBP 26.3SSI switch at 2 ohm · EBP 25.8
EBP under 50 means a motor that wants a sealed load. The Club 102SL sits at 25.8–26.3, inside that band, which is why this is a sealed build rather than a ported one.

02What the box does to it

0.605 cu ft against a 24.4 L Vas.

α = Vas ÷ Vb = 1.42  ·  Fc = Fs√(α+1) = 54–56 Hz  ·  Qtc = 1.71–1.88
20 30 50 70 100 150 200 +6 +0 -6 -12 -18 -24 FREQUENCY · Hz LEVEL · dB −3 dB
SSI switch at 4 ohm · Qtc 1.71, Fc 54 Hz, F3 37.4 HzSSI switch at 2 ohm · Qtc 1.88, Fc 56 Hz, F3 37.8 Hz
The box lifts resonance from 35.0–36.2 Hz free-air to 54–56 Hz and half power lands at 37.4–37.8 Hz, anechoic, before any cabin gain. Figures are JBL’s own Club 102SL owner’s manual, which prints a separate parameter set for each position of the impedance switch. With a Qts of 1.10 at 4 ohms and 1.22 at 2 ohms this is a high-Q woofer: no sealed box of any size brings it down to Qtc 0.707, so 0.605 cubic feet is a volume chosen for the space, and the response carries a peak of about 5 dB near 60 Hz rather than a flat rolloff. The 4 ohm setting is the tighter of the two.

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 6.0 mm, and in this alignment a subsonic filter barely moves it.

PXmax = 62–68 W unfiltered  →  62–68 W with a 25 Hz subsonic
20 30 50 70 100 150 200 0 4 8 FREQUENCY · Hz CONE TRAVEL · mm PAST LINEAR TRAVEL · Xmax 6.0 mm 62 W reaches Xmax here
SSI switch at 4 ohm · 68 W, no filterSSI switch at 2 ohm · 62 W, no filterSSI switch at 4 ohm · 68 W with subsonic at 25 Hz, 24 dB/octSSI switch at 2 ohm · 62 W with subsonic at 25 Hz, 24 dB/octXmax 6.0 mm one-way
Every trace touches the limit and no further, because each is drawn at the exact power that puts that coil on 6.0 mm. Unfiltered that is 62 W, reached first at 52 Hz. It sits under the 350 W the driver can take thermally, so the enclosure sets the ceiling, not the voice coil. The dashed traces are the same driver behind a subsonic filter at 25 Hz, 24 dB/oct, and they sit almost on top of the solid ones: 62 W against 62 W. At 54–56 Hz the filter sits well below resonance, where the sealed alignment has already rolled the cone off at 12 dB/oct, so there is little wasted travel left for it to recover. Set it anyway to keep road rumble out of the cone, but do not size the amplifier around it.
ParamValueUnitNote
Fs35.00 / 36.20Hzfree-air resonance
Qts1.097 / 1.218SSI switch at 4 ohm / SSI switch at 2 ohm
Vas24.38 / 23.49Lequivalent compliance
Sd346.4cm²effective piston area
Xmax6mmone-way linear travel
Pe350Wcontinuous RMS
SPL80.8dB1 W / 1 m, derived from T/S

Driver parameters as published by JBL Club 102SL owner's manual. Curves computed against this enclosure’s actual net airspace.

From the shop floor

Installer's take

This is the Club 102SL box for spaces that stop at 12 inches deep. Same airspace as our standard 30 by 15, laid out 41 long so it goes under a rear bench.

Know what you are buying: the Club 102SL is a high-Q shallow 10, and no sealed box flattens it. At 0.605 cubic feet per chamber it reads Qtc 1.708 on the 4 ohm setting, a punchy bump near 60 Hz. That suits rock, rap and anything that lives in the upper bass; it is not a deep, flat SQ box.

Use the 4 ohm switch position unless you need the 2 ohm load; it is the tighter of the two in this box (Qtc 1.708 against 1.875).

Measure the installed height, not the cabinet height. The box is 7.875 tall on its own and the standoffs add 1.75, so plan around 9.625 inches of stack on the 41 by 12 footprint. The motor clears the lid by 3.875, so airspace set the height.

Inserts ship in the kit, not pressed: JBL prints no bolt circle. Mark from the driver, drill, press.

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 JBL Club 102SL 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 7.875 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 JBL Club 102SL enclosure?

Same driver, different shape. The standard cabinet is 30 by 15 by 8.37 inches and was built to 0.60 cubic feet net per chamber. This cabinet is 41 by 12 by 7.875 inches and holds 0.605 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 JBL Club 102SL at either impedance setting, and will any other 10 inch fit?

The Club 102SL, yes, at either switch position: the SSI switch changes only the electrical load, not the frame. The baffle is cut to JBL's 9.00 in (228.6 mm) cutout, the 10.52 in (267.3 mm) frame covers it with margin, and the 3.25 inch motor clears the top panel with 3.875 inches to spare. Run two set the same way so the chambers match.

Any other 10, no. The airspace is chosen around the Club 102SL's 1.097 Qts and 24.4 liters of Vas at 4 ohms, and a different woofer that happened to drop into the hole would not see the alignment printed on this page.

What alignment does this cabinet give?

The Club 102SL is a high-Q woofer, Qts 1.097 at 4 ohms, and a sealed box can only raise system Q, never lower it below the driver's own, so no sealed box of any size reaches the 0.707 of a flat alignment.

At the 4 ohm setting each chamber reads Qtc 1.708, Fc 54.5 Hz, F3 37.4 Hz; at 2 ohms it reads Qtc 1.875, Fc 55.7 Hz, F3 37.8 Hz. At 4 ohms the response rises about 5 dB near 60 Hz and is 3 dB down at 37.4 Hz. Those figures exclude cabin gain, which adds real output below 50 Hz in a car.

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

JBL rates the Club 102SL at 350 watts RMS per driver and 1050 watts peak. Set both drivers' SSI switches the same. Both at 4 ohms, paralleled at the cup, gives a 2 ohm load, the usual pairing on a mono amplifier; both at 2 ohms in parallel is 1 ohm and needs an amplifier rated for it. The 4 ohm setting is also the tighter alignment in this box. Confirm your amplifier's minimum stable impedance first.

Where is the terminal cup located on a down fire enclosure?

Side mounted, and there is one cup serving both driver positions rather than one per chamber. Every Proline X Performance Optimized enclosure uses a side mounted terminal cup regardless of alignment, whether standard, wedge, or down fire. On this cabinet that keeps the connection accessible with the enclosure in its installed position, since both baffles face the floor. The cup is our Proline X ABS and carbon fiber composite unit, recessed, with stainless hardware, copper ring terminals, and pre-wired 12 gauge OFC.

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 0.605 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 1.75 inch standoffs uninstalled, and a threaded insert kit with stainless machine screws.

The inserts ship loose on purpose: JBL prints no bolt circle for the Club 102SL, so you set the driver in the recess, mark its holes, drill and press the inserts. Bring your own pair of Club 102SL.

Same series, same size

Other Performance Optimized models