Proline X PO 10TW-S W LCS10 sealed wedge enclosure, product photos pending. Placeholder graphic reading Photos Coming Soon.

Performance Optimized · Datasheet

Performance Optimized Wedge Wide Sealed Triple 10" Enclosure Sundown Audio LCS v.2 10 · Triple 10" Sealed enclosure

Net volume: 0.638 cu ft per driver, 1.92 cu ft total, after both dividers and Sundown Audio's published 0.050 cu ft displacement per driver
Max mounting depth: 5.25 in required; 0.75 in clearance above the motor against the raked rear panel
External dimensions: 40 in W × 17 in at the seat face H × 12.49 in at the base D
Front baffle: 1.5 in double baffle, outer layer machined as a flush recess

Buy at Audio IntensityFactory-direct, ships from Tullahoma

Sundown Audio LCS v.2Buy at Audio Intensity

Best For: Triple Sundown Audio LCS v.2 10 SUV Cargo-Floor Builds
Net Volume: 0.638 cu ft per Driver (1.92 cu ft Net Total)
Driver Match: Three Sundown Audio LCS v.2 10 (S8), matched
Construction: 3 Chambers | 40" Wide Wedge | V-Groove/Dado | Double 1.5" Baffle | 3 Terminal Cups

Spec of record

Technical specifications

Specification	Value
Series	Proline X Performance Optimized Wedge Wide
Compatible Driver	Sundown Audio LCS v.2 10, quantity 3, matched. Direct fit
Configuration	Triple 10 inch sealed wedge, 3 chambers, 1 driver per chamber
Mounting Position	SUV cargo floor, raked face against the rear seat back
Firing Direction	Rearward toward the liftgate. Not a down fire design
External Width	40 in
External Height	17 in at the seat face
External Depth	12.49 in at the base, tapering to 6.30 in at the top
Internal Volume, Gross	2.15 cu ft total
Internal Volume, Net Acoustic	0.638 cu ft per driver, 1.92 cu ft total, after both dividers and Sundown Audio's published 0.050 cu ft displacement per driver
Driver Mounting Depth	5.25 in required; 0.75 in clearance above the motor against the raked rear panel
Alignment Per Driver	LCS v.2 10" Subwoofers Qtc 0.967, fc 65.7 Hz, F3 52.5 Hz anechoic
Woofer Openings	3 at 9.375 in
Woofer Layout	One row across the face
Frame Outer Diameter	10.25 in
Fs / Qts / Qes / Qms	34.8 Hz / 0.512 / 0.567 / 5.331
Vas / Sd / Xmax	46.2 L / 457 cm2 / 14 mm
Driver Power Handling	500 W RMS per driver, 1500 W RMS for the set of 3 (thermal rating)
Recommended Amplifier	350-500 W RMS per driver, 1,050-1,500 W RMS for the full set, at 2.67 ohms
Parameter Source	Sundown Audio published specifications
Material	Langboard Elite MDF
Construction	CNC cut, V-groove and dado joinery
Panel Thickness	0.75 in
Front Baffle	1.5 in double baffle, outer layer machined as a flush recess
Internal Bracing	Two full-height 3/4 in dividers
Driver Mounting	Threaded inserts, stainless machine screws included
Terminal Cups	Three Proline X ABS and carbon fiber composite, on the rear panel, one per chamber, pre wired 12 gauge OFC
Acrylic Insert	Gloss black acrylic baffle insert standard
Damping	Light polyfill wall lining in every chamber, does not alter acoustic volume
Carpet	Plush black
Shipping Weight	66 lb
Warranty	1 Year Limited
Built In	Tullahoma, Tennessee

Modelled response

Performance in this enclosure

Net airspace

0.638

cu ft per driver

System Qtc

0.97

sealed

Half power

52.5

Hz · F3

Xmax at

780

W RMS per driver · no filter

With 25 Hz subsonic

787

W RMS per driver · +1%

Amplifier, per driver

350–500

W RMS recommended

This enclosure holds 0.638 cu ft net per driver. In it the Sundown Audio LCS v.2 10" Subwoofers runs a system Qtc of 0.97 with half power at 52.5 Hz, and the cone reaches its 14.0 mm travel limit at 780 W per driver, above the driver’s 500 W thermal rating, so heat stops you before travel does. A 25 Hz subsonic filter adds little here: 787 W per driver against 780 W, 1 percent. The box already resonates at 66 Hz, so its own rolloff has removed most of what the filter would have stopped.

00Sizing the amplifier

Every wattage on this panel is per driver. This cabinet holds three, so the amplifier feeds all three at once.

Per driver 350–500 W RMS × 3 drivers = full set 1,050–1,500 W RMS at 2.67 ohms

Look for a mono amplifier rated 1,050–1,500 W RMS at 2.67 ohms, the load the set wires to most easily. The top is the driver’s 500 W thermal rating; with the 25 Hz subsonic set the cone still has travel to spare there, reaching Xmax only at 787 W. Below the bottom of the range it will play, just with less headroom; above the top you are buying power the drivers cannot use.

01Is it a sealed driver?

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

EBP = Fs ÷ Qes = 61.5

S8 · EBP 61.5

At 61.5 the LCS v.2 10" Subwoofers 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

0.638 cu ft against a 46.2 L Vas.

α = Vas ÷ Vb = 2.56 · Fc = Fs√(α+1) = 66 Hz · Qtc = 0.97

S8 · Qtc 0.97, Fc 66 Hz, F3 52.5 Hz

The box lifts resonance from 34.8 Hz free-air to 66 Hz and half power lands at 52.5 Hz, anechoic, before any cabin gain. Figures are Sundown Audio’s published parameters; Qes and Qms reproduce the printed Qts. This cabinet holds three drivers in three separate sealed chambers of 0.638 cubic feet each, the volume plotted here.

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

P_Xmax = 780 W per driver unfiltered → 787 W per driver with a 25 Hz subsonic

S8 · 780 W, no filterS8 · 787 W with subsonic at 25 Hz, 24 dB/octXmax 14.0 mm one-way

Every trace touches the limit and no further, because each is drawn at the exact power that puts that coil on 14.0 mm. Unfiltered that is 780 W per driver, reached first at 45 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, and they sit almost on top of the solid ones: 787 W per driver against 780 W. At 66 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.

Param	Value	Unit	Note
Fs	34.84	Hz	free-air resonance
Qts	0.512		S8
Vas	46.25	L	equivalent compliance
Sd	457.4	cm²	effective piston area
Xmax	14	mm	one-way linear travel
Pe	500	W	continuous RMS
SPL	87.2	dB	1 W / 1 m, derived from T/S

Driver parameters as published by Sundown Audio LCS v.2 10" Subwoofers published specifications. Curves computed against this enclosure’s actual net airspace.

From the shop floor

Installer's take

Start with the size. The maker's recommended sealed size is 0.50 per driver, but the 5.25 in deep motor sets the top of the wedge at 6.30 in, and the smallest box that clears it holds 0.638 per driver. 0.638 cubic feet per driver puts the LCS v.2 10 at Qtc 0.967, resonance 65.7 Hz, half power 52.5 Hz anechoic: a firm lift near resonance, 1.1 dB above flat.

Measure the base depth, not the top. This cabinet is 12.49 in deep where it meets the floor, 6.30 at the top, 40 wide and 17 tall. In an SUV the 40 has to clear between the rear wheel wells at floor height, the base depth is measured from the seat back with the seat upright and latched, and the 17 has to clear the cargo cover.

All three terminal cups are on the rear panel, and the rear panel is the face that goes against the seat back. Wire all three before the box goes in, with enough slack to slide it into place; once the raked face is against the seat you cannot reach them.

Impedance. LCS v.2 10" Subwoofers: wire for 2.67 ohms (the three in parallel), the load most monoblocks are built to deliver full power into; 24 ohms is the other clean option (the three in series). Work the load out before you buy the amplifier, not after.

Power. Size the amplifier for the set, not one driver: 350 to 500 W RMS per driver is 1,050 to 1,500 W RMS across all 3 at 2.67 ohms.

Sundown Audio's Qes and Qms reproduce the printed Qts within 3 percent, so the alignment rests on a self-consistent set.

Polyfill is in as a wall lining in every chamber. Do not add more: it makes the box act larger and walks Qtc off 0.97.

Before you order

Questions

Does this fit the Sundown Audio LCS v.2 10, and its coil versions?

Yes. Each opening is cut to 9.375 in for the 10.25 in frame, and the 5.25 in deep motor clears the raked rear panel with 0.75 in to spare. Coil versions of the Sundown Audio LCS v.2 10 share the frame, cutout and mounting depth, so any of them drops in. The alignment on this page is computed on the LCS v.2 10" Subwoofers parameters.

Run three matched drivers, same model and same coil, so every chamber sees the alignment on this page.

Why 0.638 cubic feet per driver, and what alignment does it target?

On Sundown Audio's published Fs 34.8 Hz, Qts 0.512 and Vas 46.2 liters, 0.638 cubic feet per driver gives Qtc 0.967, system resonance 65.7 Hz and half power 52.5 Hz.

The maker's recommended sealed size is 0.50 cubic feet per driver, but the 5.25 in deep motor sets the shallowest the wedge can be, so it comes down only to 0.638: a firm lift near resonance, 1.1 dB above flat.

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

Sundown Audio rates the LCS v.2 10 at 500 watts RMS per driver. Recommended amplifier: 350 to 500 W RMS per driver, 1,050 to 1,500 W RMS for the full set of 3.

Each LCS v.2 10" Subwoofers has a single 8 ohm voice coil. The three in parallel present 2.67 ohms; in series, 24 ohms. Check the result against your amplifier's minimum stable impedance before powering up.

Will it fit my SUV?

It is 40 inches wide, 17 tall and 12.49 deep at the base, tapering to 6.30 at the top. Measure between the rear wheel wells, the floor depth with the seat upright, and the height under your cargo cover.

The raked face goes against the seat back and the woofers fire toward the liftgate.

Why are all three terminal cups on the back?

Each driver has its own sealed chamber, and the center chamber has no side wall to take a cup. Putting all three on the rear panel gives a matching set, one cup per chamber.

Wire them at the amplifier end; there is no cross-chamber wiring inside the cabinet.

What is the expected low-frequency extension?

Anechoic F3 is 52.5 Hz per driver with system resonance at 65.7 Hz.

Those figures exclude cabin gain. An SUV cabin adds real output below about 50 Hz, so in-vehicle response runs deeper than the numbers above.

Do I need to add polyfill or damping?

No. Polyfill is already installed as a light wall lining in every chamber, and the quantity is chosen so it does not change the acoustic volume.

Do not add more. Packing a sealed box makes it behave as though it were larger, which moves the alignment away from 0.638 cubic feet per driver.

Are the drivers included?

No. This is an enclosure only. You receive the cabinet finished in plush black carpet with the gloss black acrylic baffle insert, three pre-wired terminal cups on the rear panel, the polyfill lining in place, threaded inserts and stainless machine screws.

Bring three matched Sundown Audio LCS v.2 10 drivers. The cabinet is cut direct fit to them, not a general purpose 10 inch box.

Same series, same size