Proline X PO 12-S W RSQ3 single sealed wedge enclosure, product photos pending. Placeholder graphic reading Photos Coming Soon.

Performance Optimized · Datasheet

Performance Optimized Wedge Sealed 12" Enclosure | One Audio RSq3 Single 12" Sealed enclosure

Net volume
1.20 cu ft after 0.23 displacement
Max mounting depth
8.50 in required
External dimensions
21.59 in W × 15 in at the seat face H × 15.40 in at the base D
Front baffle
1.5 in, double baffle
Buy at Audio Intensity
  • Best For: One Audio RSq3 Trunk-Fit SQ Builds
  • Net Volume: 1.20 cu ft (1.43 cu ft Gross)
  • Alignment: Qtc 0.679 (D1) / 0.649 (D2), F3 39.6 to 40.8 Hz
  • Driver Match: One Audio RSq3 (D1 or D2)
  • Watch the impedance: D1 parallels to 0.5 ohms, D2 to 1 ohm
  • Construction: Rear-Firing Wedge | V-Groove/Dado | Double 1.5" Baffle | Threaded Inserts

Technical specifications

SpecificationValue
SeriesProline X Performance Optimized Wedge
Compatible DriverOne Audio RSq3, quantity 1. Direct fit, either coil version
ConfigurationSingle 12 inch, single 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 Width21.59 in
External Height15 in at the seat face
External Depth15.40 in at the base, tapering to 9.94 in at the top
Internal Volume, Gross1.43 cu ft
Internal Volume, Net Acoustic1.20 cu ft after 0.23 displacement
Published Target1.20 cu ft net sealed
Alignment, RSq3 D1Qtc 0.679, fc 38.0 Hz, F3 39.6 Hz anechoic (dual 1 ohm)
Alignment, RSq3 D2Qtc 0.649, fc 37.2 Hz, F3 40.8 Hz anechoic (dual 2 ohm)
Woofer Opening11.125 in (283 mm) direct fit
Driver Mounting Depth8.50 in required
Driver Frame Diameter12.625 in
Driver Displacement0.23 cu ft each, unusually large for a 12 in
Driver Power Handling1500 W
Driver Xmax32 mm as published, basis not stated
Wiring OptionsD1: 2 ohms series, 0.5 ohms parallel. D2: 4 ohms series, 1 ohm parallel
MaterialLangboard Elite MDF
ConstructionCNC cut, V-groove and dado joinery
Panel Thickness0.75 in
Front Baffle1.5 in, double baffle
Internal BracingWindowed C-brace, dadoed to top, back and bottom
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
Weight34 lb
Warranty1 Year Limited
Built InTullahoma, Tennessee

Performance in this enclosure

Net airspace
1.20
cu ft per chamber
System Qtc
0.65–0.68
sealed
Half power
39.6–40.8
Hz · F3
Xmax at
1955
W RMS · no filter
With 25 Hz subsonic
3187
W RMS · +63%
Amplifier
1500
W RMS recommended
This enclosure holds 1.20 cu ft net per chamber. In it the One Audio RSq3 runs a system Qtc of 0.65–0.68 with half power at 39.6–40.8 Hz, and the cone reaches its 32.0 mm travel limit at 1955 W, above the driver’s 1500 W thermal rating, so heat stops you before travel does. Run a subsonic filter at 25 Hz and that becomes 3187 W — +1232 W, or 63 percent more power for the same 32.0 mm of travel.

01Is it a sealed driver?

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

EBP = Fs ÷ Qes = 49.6–50.6
SEALED 0–50 TRANSITION 50–100 PORTED 100–150 0 50 100 150 RSq3 D1 49.6 RSq3 D2 50.6
RSq3 D1 · EBP 49.6RSq3 D2 · EBP 50.6
The RSq3 straddles the boundary at 49.6–50.6 depending on coil — part sealed-band, part transition. Either way it takes a sealed load happily; the coil you run shifts the alignment more than it shifts this verdict.

02What the box does to it

1.20 cu ft against a 37.0 L Vas.

α = Vas ÷ Vb = 1.09  ·  Fc = Fs√(α+1) = 37–38 Hz  ·  Qtc = 0.65–0.68
20 30 50 70 100 150 200 +6 +0 -6 -12 -18 -24 FREQUENCY · Hz LEVEL · dB −3 dB
RSq3 D1 · Qtc 0.68, Fc 38 Hz, F3 39.6 HzRSq3 D2 · Qtc 0.65, Fc 37 Hz, F3 40.8 Hz
The box lifts resonance from 25.8–26.3 Hz free-air to 37–38 Hz and half power lands at 39.6–40.8 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 32.0 mm — and a bigger one once a subsonic filter stops it wasting travel below the passband.

PXmax = 1955–1956 W unfiltered  →  3187–3362 W with a 25 Hz subsonic
20 30 50 70 100 150 200 0 8 16 24 32 40 FREQUENCY · Hz CONE TRAVEL · mm PAST LINEAR TRAVEL · Xmax 32.0 mm 1955 W reaches Xmax here
RSq3 D1 · 1955 W, no filterRSq3 D2 · 1956 W, no filterRSq3 D1 · 3187 W with subsonic at 25 Hz, 24 dB/octRSq3 D2 · 3362 W with subsonic at 25 Hz, 24 dB/octXmax 32.0 mm one-way
Every trace touches the limit and no further, because each is drawn at the exact power that puts that coil on 32.0 mm. Unfiltered that is 1955 W, reached first at 20 Hz. It sits above the 1500 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 3187 W before hitting the same 32.0 mm. That is 63 percent more amplifier for the price of one filter setting.
ParamValueUnitNote
Fs26.30 / 25.80Hzfree-air resonance
Qts0.470 / 0.450RSq3 D1 / RSq3 D2
Vas37.01 / 36.78Lequivalent compliance
Sd480.0cm²effective piston area
Xmax32mmpublished without a stated basis
Pe1500Wcontinuous RMS
SPL82.9dB1 W / 1 m, derived from T/S

Driver parameters as published by oneaudiousa.com. Curves computed against this enclosure’s actual net airspace.

Installer's take

Check the impedance before anything else. The RSq3 comes dual 1 ohm or dual 2 ohm and the parallel options are brutal: 0.5 ohms on a single D1, and 0.25 ohms if you parallel all four coils of a D1 pair. That is not a load most amplifiers survive. Series wiring is the default answer on this driver.

This driver displaces 0.23 cubic feet, two to four times a normal 12 inch, so the cabinet is bigger than the 1.20 net figure suggests. Gross is 1.43 per chamber. Do not compare the external size to another 12 inch box and assume we over built it.

Measure the base depth. The cabinet is 15.40 inches deep at the trunk floor and 9.94 at the top, and it is 21.59 wide. The floor dimension decides whether it goes in.

Both coils land well damped: Qtc 0.679 on the D1 and 0.649 on the D2, F3 39.6 to 40.8. Unlike some drivers in this program there is no awkward alignment story to manage here.

Polyfill is already in as a wall lining. Adding more makes the box act larger and walks the alignment off the published target.

Questions

Will this enclosure fit both the RSq3 D1 and the RSq3 D2?

Yes. Both coil versions share the same frame, the same 11.125 in cutout and the same 8.50 in mounting depth, so the baffle is cut once and fits either.

They land close acoustically too: Qtc 0.679 on the D1 and 0.649 on the D2 in this cabinet. The choice between them is an impedance decision, not an enclosure one, and on this driver that decision matters more than usual.

Why 1.20 cubic feet net?

That is the published sealed recommendation for the RSq3, and it produces a well damped alignment on both coils: Qtc 0.649 to 0.679 with F3 between 39.6 and 40.8 Hz.

Each chamber is 1.43 cubic feet gross. The RSq3 displaces 0.23 cubic feet, which is two to four times what a typical 12 inch takes out, so the cabinet has to be built noticeably larger than the net figure alone would suggest.

What amplifier power should I run, and what impedance?

The RSq3 is published at 1500 watts. Impedance is where this driver needs care: it comes as a dual 1 ohm or a dual 2 ohm.

A single dual 1 ohm gives 2 ohms in series or 0.5 ohms in parallel, and almost nothing is stable into 0.5. A single dual 2 ohm gives 4 ohms or 1 ohm. Work out the wiring before you choose the amplifier.

How does a wedge enclosure improve the sound in a trunk installation?

The angled seat-side face matches the roughly 20 degree lean of a factory rear seat, so the cabinet sits flat against it instead of leaving a wasted triangle. The vertical trunk-lid-side face carries the driver, firing rearward into the trunk cavity.

Firing rearward means output loads into the trunk volume and reaches the cabin through the rear seat and deck rather than beaming at the back of your head, which makes it easier to keep the stage forward. The taper also gives height back where the lid closes, so you keep usable cargo space.

Why is the front baffle double-layered?

The baffle is two bonded 3/4 inch sheets, 1.5 inches through. A subwoofer pushes as hard against its mounting surface as it does against the air, and a single 3/4 inch panel flexes under that load, which smears output and works the driver loose.

That matters more than usual here. The RSq3 is a heavy, long throw driver, so the reaction load into the baffle is high. The 1.5 inches also gives the threaded inserts real material to hold in.

What is the expected low-frequency extension?

Anechoic F3 lands between 39.6 and 40.8 Hz depending on coil, at Qtc 0.649 to 0.679. That is a properly damped sealed alignment rather than a peaked one.

Those figures are anechoic and exclude cabin gain. In a car the transfer function of the cabin adds real output below 50 Hz, so in-vehicle response runs deeper than the number above.

Do I need to add polyfill or damping?

No. Polyfill is already installed 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 would move the alignment off the 1.20 cubic feet this driver is specified for.

Is the One Audio RSq3 included?

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

The RSq3 is purchased separately. The cabinet is cut direct fit to that driver, so it is not a general purpose 12 inch box.

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