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Proline X PO 10D-S W IKW10 sealed wedge, front baffle with gloss black insert and pre-wired leads, 27.5 by 15 inches.
Proline X PO 10D-S W IKW10 sealed wedge, side profile with recessed terminal cup, 11.9 inch base, 15 inches tall.

Performance Optimized · Datasheet

Helix IK W10 Dual Box: Sealed 10" Wedge Enclosure Dual 10" Sealed enclosure

Net volume
1.06 cu ft total, 0.53 per driver
Max mounting depth
4.96 in required by the driver
Cutout
9.1300 in
External dimensions
27.46 in W × 15 in at the seat face H × 11.86 in at the base D
Front baffle
1.5 in, double baffle
Buy at Audio IntensityFactory-direct, ships from Tullahoma
Helix IK W10Buy at Audio Intensity
  • Best For: Dual Helix IK W10 Trunk-Fit Builds
  • Net Volume: 0.53 cu ft per driver (0.60 cu ft Gross per chamber)
  • Alignment: Qtc 0.670 to 0.705, fc 52.3 to 65.1 Hz, F3 55.4 to 65.3 Hz anechoic
  • Driver Match: Pair of Helix IK W10 (matched), SVC2 or DVC2
  • Impedance: 1 or 4 ohm with SVC2; 2 ohm with DVC2
  • Construction: Dual Chamber | Rear-Firing Wedge | V-Groove/Dado | Double 1.5" Baffle | Threaded Inserts

Spec of record

Technical specifications

SpecificationValue
SeriesProline X Performance Optimized Wedge
Compatible DriverHelix IK W10 SVC2 or DVC2, quantity 2. Direct fit
ConfigurationDual 10 inch, dual chamber sealed wedge
Mounting PositionTrunk or cargo area, tall face against the rear seat back
Firing DirectionRearward into the trunk. Not a down fire design, no feet included
External Width27.46 in
External Height15 in at the seat face
External Depth11.86 in at the base, tapering to 6.40 in at the top
Internal Volume, Gross1.20 cu ft total, 0.60 per chamber
Internal Volume, Net Acoustic1.06 cu ft total, 0.53 per driver
AlignmentQtc 0.670 to 0.705, fc 52.3 to 65.1 Hz, F3 55.4 to 65.3 Hz anechoic
Helix Recommended Volume15 litres net, which is what this is built to
Driver Cutout9.1300 in
Driver Mounting Depth4.96 in required by the driver
Power Handling600 watts RMS total across the pair
ImpedanceSVC2 is a single 2 ohm coil; DVC2 is dual 2 ohm, 1 ohm parallel or 4 ohm series
Xmax8 mm one way, both coil versions
MaterialLangboard Elite MDF
ConstructionCNC cut, V-groove and dado joinery
Panel Thickness0.75 in
Front Baffle1.5 in, double baffle
Internal BracingFull chamber divider
Driver MountingThreaded inserts at every mounting location, stainless machine screws included
Terminal CupsOne Proline X ABS and carbon fiber composite, side mounted, pre wired 12 gauge OFC
DampingLight polyfill wall lining, does not alter acoustic volume
CarpetPlush black
Weight36 lb
Warranty1 Year Limited
Built InTullahoma, Tennessee

Modelled response

Performance in this enclosure

Net airspace
0.53
cu ft per chamber
System Qtc
0.67–0.70
sealed
Half power
55.4–65.3
Hz · F3
Xmax at
138
W RMS · no filter
With 25 Hz subsonic
179
W RMS · +30%
Amplifier
300
W RMS recommended
This enclosure holds 0.53 cu ft net per chamber. In it the Helix IK W10 runs a system Qtc of 0.67–0.70 with half power at 55.4–65.3 Hz, and the cone reaches its 8.0 mm travel limit at 138 W, below the driver’s 300 W thermal rating, so travel is what stops you here, not heat. Run a subsonic filter at 25 Hz and that becomes 179 W — +41 W, or 30 percent more power for the same 8.0 mm of travel.

01Is it a sealed driver?

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

EBP = Fs ÷ Qes = 71.1–83.7
SEALED 0–50 TRANSITION 50–100 PORTED 100–150 0 50 100 150 SVC2 71.1 DVC2 83.7
SVC2 · EBP 71.1DVC2 · EBP 83.7
At 71.1–83.7 the IK W10 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

0.53 cu ft against a 25.0 L Vas.

α = Vas ÷ Vb = 1.67  ·  Fc = Fs√(α+1) = 52–65 Hz  ·  Qtc = 0.67–0.70
20 30 50 70 100 150 200 +6 +0 -6 -12 -18 -24 FREQUENCY · Hz LEVEL · dB −3 dB
SVC2 · Qtc 0.67, Fc 52 Hz, F3 55.4 HzDVC2 · Qtc 0.70, Fc 65 Hz, F3 65.3 Hz
The box lifts resonance from 32.0–36.0 Hz free-air to 52–65 Hz and half power lands at 55.4–65.3 Hz, anechoic, before any cabin gain. The wedge and the down-fire, single and dual, all hold this same volume per chamber, so these numbers describe every version of this enclosure. Power figures are per driver, for one driver in its own chamber. Helix measures the SVC2 and the DVC2 separately rather than publishing one set for both, so both are carried here rather than averaged. Note that the F3 above is anechoic and reads higher than the figure on Helix's datasheet, which is quoted with their recommended DSP highpass applied.

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

PXmax = 138–156 W unfiltered  →  179–181 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 8.0 mm 138 W reaches Xmax here
SVC2 · 138 W, no filterDVC2 · 156 W, no filterSVC2 · 181 W with subsonic at 25 Hz, 24 dB/octDVC2 · 179 W with subsonic at 25 Hz, 24 dB/octXmax 8.0 mm one-way
Every trace touches the limit and no further, because each is drawn at the exact power that puts that coil on 8.0 mm. Unfiltered that is 138 W, reached first at 20 Hz. It sits under the 300 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: stopping the cone wasting travel below the passband lets it take 179 W before hitting the same 8.0 mm. That is 30 percent more amplifier for the price of one filter setting.
ParamValueUnitNote
Fs32.00 / 36.00Hzfree-air resonance
Qts0.410 / 0.390SVC2 / DVC2
Vas25.00 / 34.00Lequivalent compliance
Sd333.0cm²effective piston area
Xmax8mmone-way linear travel
Pe300Wcontinuous RMS
SPL84.5dB1 W / 1 m, derived from T/S

Driver parameters as published by audiotec-fischer.de and the HELIX datasheet. Curves computed against this enclosure’s actual net airspace.

From the shop floor

Installer's take

0.53 cubic feet net per driver at Qtc 0.670 to 0.705 and F3 55.4 to 65.3 Hz anechoic, computed from Helix's published Thiele-Small. That is Helix's own recommended sealed volume.

Helix measures the SVC2 and the DVC2 separately rather than publishing one set of parameters for both, and on this model they recommend different volumes: 15 litres for the SVC2 and 12 for the DVC2. This cabinet is cut to the larger, which puts both versions on almost the same alignment: Qtc 0.670 with the SVC2 and 0.705 with the DVC2.

Do not be thrown by the F3. Half power lands at 55.4 to 65.3 Hz anechoic, before any cabin gain. Helix's own datasheet prints 45 Hz for this driver, which is a different measurement rather than a disagreement: their figure is quoted with their recommended 45 Hz, Q 1.5 highpass applied, and a filter at that corner lifts the response enough to move the half-power point down to meet it. The number above is the raw sealed response of this cabinet.

On impedance: The IK W series comes in two coil versions and a pair wires differently in each. Two SVC2 drivers, each a single 2 ohm coil, give 1 ohm in parallel or 4 ohms in series. Two DVC2 drivers give more choices; the sensible target is 2 ohms, reached by wiring each driver's coils in series for 4 ohms and then the pair in parallel. Every driver in the cabinet must be wired identically, and 1 ohm needs an amplifier rated for it.

Measure before you order. This cabinet is 27.46 inches wide, 11.86 deep at the base and 15 tall.

Before you order

Questions

Will this fit the IK W10 SVC2 and the DVC2?

Yes. The two coil versions share a frame, a 9.1300 in cutout and the same 4.96 in mounting depth, so the cabinet fits either. Helix measures the SVC2 and the DVC2 separately rather than publishing one set of parameters for both, and on this model they recommend different volumes: 15 litres for the SVC2 and 12 for the DVC2. This cabinet is cut to the larger, which puts both versions on almost the same alignment: Qtc 0.670 with the SVC2 and 0.705 with the DVC2.

Why 0.53 cubic feet net per driver?

Because that is the sealed volume Helix publishes for this driver, 15 litres, and it is a net figure in their documentation exactly as it is in ours. Each chamber is 0.60 cu ft gross before the driver's displacement.

What amplifier power should I run, and what impedance?

The Helix IK W10 is rated 300 watts RMS each, so 600 across the pair. The IK W series comes in two coil versions and a pair wires differently in each. Two SVC2 drivers, each a single 2 ohm coil, give 1 ohm in parallel or 4 ohms in series. Two DVC2 drivers give more choices; the sensible target is 2 ohms, reached by wiring each driver's coils in series for 4 ohms and then the pair in parallel. Every driver in the cabinet must be wired identically, and 1 ohm needs an amplifier rated for it. Aim for roughly 420 to 600 watts at whichever impedance you wire to.

Why is your F3 higher than the one on Helix's datasheet?

Half power lands at 55.4 to 65.3 Hz anechoic, before any cabin gain. Helix's own datasheet prints 45 Hz for this driver, which is a different measurement rather than a disagreement: their figure is quoted with their recommended 45 Hz, Q 1.5 highpass applied, and a filter at that corner lifts the response enough to move the half-power point down to meet it. The number above is the raw sealed response of this cabinet.

Why two separate chambers instead of one shared one?

A shared chamber lets each cone modulate the other's air load, which makes the pair less predictable under hard excursion. A full divider gives each driver its own sealed volume, so both behave exactly as the single version does.

What is the expected low-frequency extension?

Half power lands at 55.4 to 65.3 Hz anechoic, before any cabin gain. Qtc is 0.670 to 0.705. These figures exclude cabin gain, which in most vehicles adds real output below 40 Hz, and they exclude any DSP you choose to run.

Do I need to add polyfill or damping?

No. Polyfill is already installed as a light wall lining and the quantity is chosen so it does not change the acoustic volume. Do not add more.

Are the drivers included?

No. This is an enclosure only. You receive the cabinet finished in plush black carpet, with threaded inserts at both driver positions, stainless machine screws, one side-mounted pre-wired terminal cup and the polyfill lining already installed.

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