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Proline X PO 12-S W 712F sealed wedge, front baffle with gloss black insert and pre-wired leads, 15.12 by 15 inches.
Proline X PO 12-S W 712F sealed wedge, side profile with recessed terminal cup, 15.90 inch base, 15 inches tall.

Performance Optimized · Datasheet

DD Audio 712f Box: Sealed 12" Wedge Enclosure Single 12" Sealed enclosure

Net volume
0.82 cu ft
Max mounting depth
9.500 in available, 9.000 in required
Cutout
11.375 in
External dimensions
15.12 in W × 15 in at the seat face H × 15.90 in at the base D
Front baffle
1.5 in, double baffle
Buy at Audio IntensityFactory-direct, ships from Tullahoma
DD Audio 712fBuy at Audio Intensity
  • Best For: DD Audio 712f Trunk-Fit Builds
  • Net Volume: 0.82 cu ft (1.00 cu ft Gross)
  • Alignment: Qtc 0.679, fc 45.9 Hz, F3 47.9 Hz
  • Driver Match: DD Audio 712f (D2 or D4)
  • Construction: Rear-Firing Wedge | V-Groove/Dado | Double 1.5" Baffle | Threaded Insert Kit included

Spec of record

Technical specifications

SpecificationValue
SeriesProline X Performance Optimized Wedge
Compatible DriverDD Audio 712f, D2 or D4, quantity 1. Direct fit
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 Width15.12 in
External Height15 in at the seat face
External Depth15.90 in at the base, tapering to 10.44 in at the top
Internal Volume, Gross1.00 cu ft
Internal Volume, Net Acoustic0.82 cu ft
AlignmentQtc 0.679, fc 45.9 Hz, F3 47.9 Hz anechoic
Driver Cutout11.375 in
Driver Mounting Depth9.500 in available, 9.000 in required
Frame Outer Diameter12.625 in, as published by DD Audio
Driver Displacement0.170 cu ft, as published by DD Audio
Cone Area (derived)532.4 cm2, from DD's published piston diameter; DD publish no Sd
Power Handling1500 watts RMS
ImpedanceD2: 4 ohms in series or 1 ohm in parallel; D4: 8 ohms in series or 2 ohms in parallel
Xmax22 mm one way
MaterialLangboard Elite MDF
ConstructionCNC cut, V-groove and dado joinery
Panel Thickness0.75 in
Front Baffle1.5 in, double baffle
Internal BracingInternal brace
Driver MountingThreaded insert kit included, NOT pre-installed: DD publish no mounting hole locations
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
Shipping Weight30 lb
Warranty1 Year Limited
Built InTullahoma, Tennessee

Modelled response

Performance in this enclosure

Net airspace
0.82
cu ft
System Qtc
0.68
sealed
Half power
47.9
Hz · F3
Xmax at
1866
W RMS · no filter
With 25 Hz subsonic
2620
W RMS · +40%
Amplifier
1500
W RMS recommended
This enclosure holds 0.82 cu ft net . In it the DD Audio 712f runs a system Qtc of 0.68 with half power at 47.9 Hz, and the cone reaches its 22.0 mm travel limit at 1866 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 2620 W — +754 W, or 40 percent more power for the same 22.0 mm of travel.

01Is it a sealed driver?

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

EBP = Fs ÷ Qes = 62.7
SEALED 0–50 TRANSITION 50–100 PORTED 100–150 0 50 100 150 712f, D2 or D4 (DD publish one shared table) 62.7
712f, D2 or D4 (DD publish one shared table) · EBP 62.7
At 62.7 the 712f 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

0.82 cu ft against a 24.2 L Vas.

α = Vas ÷ Vb = 1.04  ·  Fc = Fs√(α+1) = 46 Hz  ·  Qtc = 0.68
20 30 50 70 100 150 200 +6 +0 -6 -12 -18 -24 FREQUENCY · Hz LEVEL · dB −3 dB
712f, D2 or D4 (DD publish one shared table) · Qtc 0.68, Fc 46 Hz, F3 47.9 Hz
The box lifts resonance from 32.1 Hz free-air to 46 Hz and half power lands at 47.9 Hz, anechoic, before any cabin gain. Figures are DD Audio’s own published table for the 712f, which covers the D2 and D4 alike. DD publish no cone area; the 532.4 square centimetre figure is derived from their published piston diameter. At 0.82 cubic feet net the 712f sits at Qtc 0.68: just under maximally flat, slightly dry.

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

PXmax = 1866 W unfiltered  →  2620 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 22.0 mm 1866 W reaches Xmax here
712f, D2 or D4 (DD publish one shared table) · 1866 W, no filter712f, D2 or D4 (DD publish one shared table) · 2620 W with subsonic at 25 Hz, 24 dB/octXmax 22.0 mm one-way
Every trace touches the limit and no further, because each is drawn at the exact power that puts that coil on 22.0 mm. Unfiltered that is 1866 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 2620 W before hitting the same 22.0 mm. That is 40 percent more amplifier for the price of one filter setting.
ParamValueUnitNote
Fs32.13Hzfree-air resonance
Qts0.475712f, D2 or D4 (DD publish one shared table)
Vas24.23Lequivalent compliance
Sd532.4cm²effective piston area
Xmax22mmone-way, as DD publish it, with no stated measurement basis
Pe1500Wcontinuous RMS
SPL83.8dB1 W / 1 m, derived from T/S

Driver parameters as published by DD Audio published 712f specifications. Curves computed against this enclosure’s actual net airspace.

From the shop floor

Installer's take

0.82 cubic feet net, solved from DD's published Fs, Qts and Vas. A maximally flat box at Qtc 0.707 would be 0.70 cubic feet, but the baffle has to carry DD's 12.625 inch frame and the cabinet has to clear the 9.000 inch motor, and the smallest wedge that does both holds 0.82. In it the 712f lands at Qtc 0.679, maximally flat, the reference musical alignment, with system resonance at 45.9 Hz. Half power lands at 47.9 Hz anechoic, before any cabin gain.

DD publishes no Sd for any of its drivers. The 532.4 square centimetre figure behind this alignment is derived from DD's own published piston diameter, which they define as measured halfway across the surround, the convention Sd itself is defined from. DD publishes no Mms, Cms or DC resistance either.

DD publishes no mounting hole locations, so the inserts are not in the baffle when the box arrives. The insert kit is in the box: set them where the woofer's own holes fall, with the drill bit and screws in the kit, and lay the gasket tape before the woofer goes down.

DD sells the 712f in D2 and D4. the D2 is two 2 ohm coils, 4 ohms in series or 1 ohm in parallel; the D4 is two 4 ohm coils, 8 ohms in series or 2 ohms in parallel. DD publishes one set of Thiele-Small parameters for the model rather than a set per coil, so this cabinet is the same either way. A parallel load at or under 1 ohm needs an amplifier rated for it.

Measure the base depth. This cabinet is 15.90 inches deep at the trunk floor, 10.44 at the top, and 15.12 wide. It is deeper at the base than it is tall, because the 712f carries a 9.000 in motor and the cabinet has to clear it.

Before you order

Questions

Will this enclosure fit both coil versions of the 712f?

Yes. DD sells the 712f in D2 and D4 and publishes one set of Thiele-Small parameters for the model rather than a set per coil, so the cabinet is the same either way. The cutout is 11.375 in and the mounting depth allowance is 9.500 in.

Why 0.82 cubic feet net?

0.82 cubic feet net, solved from DD's published Fs, Qts and Vas. A maximally flat box at Qtc 0.707 would be 0.70 cubic feet, but the baffle has to carry DD's 12.625 inch frame and the cabinet has to clear the 9.000 inch motor, and the smallest wedge that does both holds 0.82. In it the 712f lands at Qtc 0.679, maximally flat, the reference musical alignment, with system resonance at 45.9 Hz. The box is 1.00 cu ft gross before the driver's displacement of 0.170 cu ft, which is DD's own figure.

What amplifier power should I run, and what impedance?

DD rate the 712f at 1500 watts RMS. DD sells the 712f in D2 and D4. the D2 is two 2 ohm coils, 4 ohms in series or 1 ohm in parallel; the D4 is two 4 ohm coils, 8 ohms in series or 2 ohms in parallel. DD publishes one set of Thiele-Small parameters for the model rather than a set per coil, so this cabinet is the same either way. A parallel load at or under 1 ohm needs an amplifier rated for it. Aim for roughly 1050 to 1500 watts at the impedance you wire.

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.

Where does the cone area figure come from?

DD publishes no Sd for any of its drivers. The 532.4 square centimetre figure behind this alignment is derived from DD's own published piston diameter, which they define as measured halfway across the surround, the convention Sd itself is defined from. DD publishes no Mms, Cms or DC resistance either.

What is the expected low-frequency extension?

Half power lands at 47.9 Hz anechoic, before any cabin gain. Qtc is 0.679. These figures exclude cabin gain, which in most vehicles adds real output below 40 Hz. DD publish the 712f's free-air resonance at 32.13 Hz.

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.

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 and the polyfill lining installed. DD Audio publishes no mounting hole locations for this driver, so the threaded inserts are not pressed before it ships. The threaded insert kit comes in the box instead: inserts sized to the woofer, the correct drill bit, allen-head screws, an allen key and woofer gasket tape. You set them when the woofer goes in.

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