Proline X PO 12-S W SA312 sealed wedge, front baffle with gloss black insert and pre-wired leads, 18.10 by 15 inches.
Proline X PO 12-S W SA312 sealed wedge, side profile with recessed terminal cup, 17.72 inch base, 15 inches tall.

Performance Optimized · Datasheet

Performance Optimized Wedge Sealed 12" Enclosure Deaf Bonce Apocalypse DB-SA312 · Single 12" Sealed enclosure

Net volume
1.37 cu ft
Max mounting depth
11.32 in available, 10.82 in required by the driver
Cutout
11.16 in
External dimensions
18.10 in W × 15 in at the seat face H × 17.72 in at the base D
Front baffle
1.5 in, double baffle
Buy at Audio IntensityFactory-direct, ships from Tullahoma
  • Best For: Deaf Bonce Apocalypse DB-SA312 Trunk-Fit Builds
  • Net Volume: 1.37 cu ft (1.46 cu ft Gross)
  • Alignment: Qtc 0.707, fc 55.5 Hz, F3 55.6 Hz
  • Driver Match: Deaf Bonce Apocalypse DB-SA312 (DB-SA312 D1 or DB-SA312 D2)
  • Impedance: D1 2 ohms in series or 0.5 ohm in parallel; D2 4 ohms in series or 1 ohm in parallel
  • Construction: Rear-Firing Wedge | V-Groove/Dado | Double 1.5" Baffle | Threaded Inserts

Spec of record

Technical specifications

SpecificationValue
SeriesProline X Performance Optimized Wedge
Compatible DriverDeaf Bonce Apocalypse DB-SA312, 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 Width18.10 in
External Height15 in at the seat face
External Depth17.72 in at the base, tapering to 12.26 in at the top
Internal Volume, Gross1.46 cu ft
Internal Volume, Net Acoustic1.37 cu ft
AlignmentQtc 0.707, fc 55.5 Hz, F3 55.6 Hz anechoic
Driver Cutout11.16 in
Driver Mounting Depth11.32 in available, 10.82 in required by the driver
Frame Outer Diameter12.78 in, from the manual drawing
Driver Displacement (estimated)0.08 cu ft, not published by Deaf Bonce
Power Handling2800 watts RMS
ImpedanceD1 2 ohms in series or 0.5 ohm in parallel; D2 4 ohms in series or 1 ohm in parallel
Xmax28 mm one way
Sensitivity86 dB as published by Deaf Bonce
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 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
Weight30.2 lb
Warranty1 Year Limited
Built InTullahoma, Tennessee

Modelled response

Performance in this enclosure

No performance graphs are published for this enclosure. Proline X does not draw these curves by hand. Every response, sensitivity and excursion graph on this site is modeled from the woofer maker’s own published Thiele/Small parameters, run against the exact net airspace of the cabinet you are buying, and we rely on the manufacturer to provide those figures. Deaf Bonce publishes the free-air resonance, total Q and compliance volume (Fs, Qts and Vas) for the Apocalypse DB-SA312, but not the electrical Q (Qes) or the effective cone area (Sd). The sensitivity and excursion curves cannot be computed without them, so rather than publish graphs built on guessed numbers, we publish none.

What this cabinet is built from

The airspace and the sealed alignment come from the parameters Deaf Bonce does publish: Fs, Qts and Vas. This enclosure gives the Apocalypse DB-SA312 1.37 cubic feet net; its system Q and half-power frequency are on the Specifications tab. If Deaf Bonce publishes the missing parameters, the graphs will be modeled and added here.

Driver parameters as published by deafbonce.com.

From the shop floor

Installer's take

1.37 cubic feet net. That is the Butterworth volume for the DB-SA312 D2 coil, computed from Deaf Bonce's published Fs, Qts and Vas. Deaf Bonce publish no sealed recommendation for the DB-SA312 (their manual recommends a bass-reflex box), so this alignment is ours, chosen for damping and transient control rather than peak output. Half power lands at 55.6 Hz anechoic, before any cabin gain.

Two coil versions, one cabinet. In this box the DB-SA312 D2 lands at Qtc 0.707, maximally flat, the reference musical alignment, and the DB-SA312 D1 at Qtc 0.707. System resonance sits at 55.5 Hz.

The cosmetic recess is cut to the 12.78 in frame diameter read from the dimension drawing in Deaf Bonce's manual. Deaf Bonce do not publish driver displacement; the 0.08 cu ft carried here is an estimate for a 12 inch motor, and only the gross figure depends on it.

Measure the base depth. This cabinet is 17.72 inches deep at the trunk floor, 12.26 at the top, and 18.10 wide. It is deeper at the base than it is tall, because the DB-SA312 carries a 10.82 in motor and the cabinet has to clear it.

Before you order

Questions

Will this enclosure fit both the DB-SA312 D1 and the DB-SA312 D2?

Yes. The coil versions share a frame, the same 11.16 in cutout and the same 10.82 in mounting depth, so the cabinet fits either. They differ electrically, and nothing about the enclosure changes.

Why 1.37 cubic feet net?

1.37 cubic feet net. That is the Butterworth volume for the DB-SA312 D2 coil, computed from Deaf Bonce's published Fs, Qts and Vas. Deaf Bonce publish no sealed recommendation for the DB-SA312 (their manual recommends a bass-reflex box), so this alignment is ours, chosen for damping and transient control rather than peak output. In this box the DB-SA312 D2 lands at Qtc 0.707, maximally flat, the reference musical alignment, and the DB-SA312 D1 at Qtc 0.707. System resonance sits at 55.5 Hz. The box is 1.46 cu ft gross before the driver's displacement. Deaf Bonce do not publish driver displacement; the 0.08 cu ft carried here is an estimate for a 12 inch motor, and only the gross figure depends on it.

What amplifier power should I run, and what impedance?

Deaf Bonce rate the DB-SA312 at 2800 watts RMS. The DB-SA312 D1 carries two 1 ohm coils: 2 ohms in series or 0.5 ohm in parallel. The DB-SA312 D2 carries two 2 ohm coils: 4 ohms in series or 1 ohm in parallel. Run the coils in series unless the amplifier is rated stable at the parallel load; 0.5 ohm is beyond most amplifiers. Aim for roughly 1959 to 2800 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.

Why a rear-firing wedge instead of a plain box?

A rectangular box of this volume wastes the triangle of space a leaning rear seat creates, and firing into the trunk lid rather than at the seat back gives the cabin a smoother path to the passengers. The wedge takes the same air volume and puts it where the car actually has room.

What is the expected low-frequency extension?

Half power lands at 55.6 Hz anechoic, before any cabin gain. Qtc is 0.707. These figures exclude cabin gain, which in most vehicles adds real output below 40 Hz. Deaf Bonce publish the DB-SA312's free-air resonance at 33 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?

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 installed.

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