Shop
Proline X PO 12D-P W EPICX12 dual ported wedge, front baffle with gloss black insert, 32 by 16 inches.
Proline X PO 12D-P W EPICX12 dual ported wedge, side profile with the port mouth, 17.4 inch base, 16 inches tall.

Performance Optimized · Datasheet

AudioControl EPICX12 Dual Box: Ported 12" Wedge Enclosure Dual 12" Ported enclosure

Net volume
2.18 cu ft, one shared chamber (1.09 per driver)
Tuning
31.5 Hz
External dimensions
32.00" W x 16" H
Front baffle
1.5 in double baffle
Buy at Audio IntensityFactory-direct, ships from Tullahoma
AudioControl EPICX12Buy at Audio Intensity
  • Alignment: 2.18 cu ft net shared, vented at 31.5 Hz, F3 39.9 Hz
  • Drivers: Pair of AudioControl EPICX12 (EPICX12 D2 or EPICX12 D4), 500 W RMS each
  • Port: Triangular side slot, 26.4 sq in
  • Cabinet: 32.00" W x 16" H x 11.62/17.45" D

Spec of record

Technical specifications

SeriesProline X Performance Optimized Ported Wedge
Compatible DriverAudioControl EPICX12 D2 (dual 2 ohm) or EPICX12 D4 (dual 4 ohm), quantity 2. Direct fit
External Dimensions32.00" W x 16" H, 17.45" D at the base tapering to 11.62" at the top
Internal Volume, Net2.18 cu ft, one shared chamber (1.09 per driver)
Tuning31.5 Hz
PortTriangular side slot, 26.4 sq in, 24.8 in path
AlignmentF3 39.9 Hz anechoic, ripple 1.5 dB
Driver Openings11.00 in cutout, 12.40 in recess, x2 at 8.625 / 23.375 in
Driver MountingThreaded insert kit and stainless machine screws included; AudioControl publishes no bolt circle
Driver Displacement0.094 cu ft each, estimated; AudioControl publishes none for the EPICX
Parameter SourceAudioControl user manual
Motor Clearance3.28 in to the port panel
Bracing2 windowed C braces
MaterialLangboard Elite MDF, V-groove and dado joinery
Front Baffle1.5 in double baffle
Terminal CupOne, side mounted, pre wired 12 gauge OFC to both drivers
Acrylic InsertGloss black acrylic baffle insert standard
DampingNone, ships dry
CarpetPlush black
Shipping Weight62 lb
Warranty1 Year Limited
Built InTullahoma, Tennessee

Modelled response

Performance in this enclosure

Net airspace
2.18
cu ft
Tuning
31.5
Hz · Fb
Half power
39.9
Hz · F3, anechoic
Xmax at
1381
W RMS · 25 Hz subsonic
With NO filter
252
W RMS · unfiltered
Port
13.1
m/s at the mouth

01Is this driver right for a ported box?

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

EBP = Fs ÷ Qes = 50.3
SEALED 0–50 TRANSITION 50–100 PORTED 100–150 0 50 100 150 EBP 50.3
AudioControl EPICX12 D2 · EBP 50.3
Between 50 and 100 a driver takes either load, and the choice becomes one of priorities rather than of physics. The AudioControl EPICX12 D2 reads 50.3. Ported buys output and low-end reach around tuning; sealed buys a shallower rolloff below it. This cabinet takes the first trade.

02What the box does to it

2.18 cu ft net against a 118.4 L Vas, vented at 31.5 Hz.

Fb = 31.5 Hz  ·  F3 = 39.9 Hz  ·  passband ripple 1.53 dB
20 30 50 70 100 150 200 +4 0 −4 −8 −12 −16 −20 −24 −28 FREQUENCY · Hz LEVEL · dB −3 dB Fb 31.5
AudioControl EPICX12 D2 · Fb 31.5 Hz, F3 39.9 Hz
Anechoic, before any cabin gain, with the 25 Hz subsonic filter already applied. The vent takes over below 32 Hz and the cone stops doing the work there, which is what holds travel down at the bottom of the passband.

03Ported vs Sealed

No sealed comparison is shown for this driver.

A ported-versus-sealed chart is only worth reading against a sealed box someone would actually build: the one we make for the driver, or the one its maker recommends. Neither exists for the AudioControl EPICX12 D2 — we do not build a sealed enclosure for it and AudioControl publish no sealed volume for it — so rather than compare this cabinet against itself stuffed and sealed, a box no one would build, the comparison is left out.

04The watts that reach Xmax (in this enclosure)

Travel scales with the square root of power, so there is one wattage that puts both cones exactly on AudioControl's published 8.5 mm. The two traces are the same cabinet with the subsonic filter switched on and switched off. Every power figure in this section is for the pair, split evenly.

PXmax = 1381 W with a 25 Hz subsonic  ·  252 W with none  →  the filter is worth 5.5×
20 30 50 70 100 150 200 0 4 8 FREQUENCY · Hz CONE TRAVEL · mm PAST LINEAR TRAVEL · Xmax 8.5 mm 1381 W reaches Xmax here
1381 W · subsonic at 25 Hz, 24 dB/oct252 W · no subsonic filterXmax 8.5 mm one-way, published
Each trace touches the limit and no further, because each is drawn at the exact power that puts the cone on 8.5 mm. With a 25 Hz subsonic that takes 1381 W, reached first at 53 Hz. Take the filter away and the same cabinet reaches 8.5 mm on 252 W — the filter is worth 5.5× the safe power. A vent unloads the cone below tuning, so there is nothing holding it once the box stops loading: on a sealed build a subsonic filter is an improvement, here it is required equipment. The unfiltered trace is still rising where this chart stops at 20 Hz, so treat 252 W as a bound rather than a floor. Every wattage on this page is a MECHANICAL limit, not an electrical one. It is the power at which the cone runs out of linear travel in this cabinet, and nothing more. What the voice coil can dissipate as heat is a separate ceiling set by the driver, not by the box — AudioControl rate this one at 1000 W RMS, and that is the number that binds first here: heat stops you before travel does, so treat 1000 W as the ceiling and the travel figures above as headroom. Final wired impedance, amplifier output and how long you hold the level are all electrical questions this graph does not answer.

From the shop floor

Installer's take

Two EPICX12s on 2.18 cubic feet at 31.5 Hz, one shared chamber, 39.9 Hz anechoic. The mouth runs about 13 m/s with both at 500 watts.

Drivers sit at 8.625 and 23.375 from the mouth side, braces between them, each motor inside a brace window.

AudioControl prints no bolt circle, so the baffle ships undrilled with a threaded insert kit and stainless machine screws: set each driver in its recess, mark its holes, drill and press the inserts. Ships dry, subsonic near 26 Hz.

Before you order

Questions

Why is this enclosure tuned to 31.5 Hz?

This cabinet gives the pair 2.18 cubic feet in one shared chamber, 1.09 per driver, vented at 31.5 Hz through a 26.4 square inch triangular port, and reaches 39.9 Hz anechoic in a 32 by 16 inch dual wedge. The port runs 19.6 m/s in the channel and 13.1 at the flared mouth with both drivers at 500 watts, and each cone peaks at 7.2 of its 8.5 mm. Passband ripple is 1.5 dB. Our sealed dual wedge (PO 12D-S W EPICX12) holds 1.25 cubic feet per chamber at Qtc 0.89 with half power at 41 Hz; this ported box reaches deeper.

Why the 20 degree wedge, and why rear-firing?

The rake on the back matches a factory rear seat so the cabinet sits flush and the trunk floor in front stays usable; the baffle is vertical and fires rearward, using the trunk as an acoustic extension.

Do I need a subsonic filter?

Yes. Below 31.5 Hz the port no longer controls the cones; set the filter near 26 Hz.

How much power can I run, and at what impedance?

AudioControl rates the EPICX12 at 500 watts RMS per driver, 1000 across the pair; aim for 350 to 500 per driver. Each EPICX12 D2 has two 2 ohm coils: a pair lands on 2 ohms with each woofer's coils in series and the two woofers in parallel, or 8 ohms all in series. 0.5 ohm, everything in parallel, is outside what most amplifiers are built for. A pair of EPICX12 D4 (two 4 ohm coils each) lands on 4 ohms with each woofer's coils in series and the woofers in parallel, or 1 ohm with everything in parallel if the amplifier is rated for it.

Would a sealed box be better for me?

Our sealed dual wedge for the EPICX12 holds 1.25 cubic feet per chamber at Qtc 0.89, half power 41 Hz: tighter and smaller. This ported box reaches 39.9 Hz on the same pair.

How does the side port work?

The port is a triangular slot along the back, 24.8 inches of path, exiting through the side panel with a rounded mouth so the air leaves without a sharp edge to chuff on.

Does this enclosure ship with polyfill?

No, and do not add any: fill in a ported box detunes it.

Are the EPICX12s included?

No. This is an enclosure only, for a pair you supply. It fits both AudioControl versions, the EPICX12 D2 (dual 2 ohm) and the EPICX12 D4 (dual 4 ohm); the pair is tuned on the EPICX12 D2 and the EPICX12 D4 was run through the same cabinet: F3 40.8 Hz, ripple 1.9 dB, each cone 7.4 of its 8.5 mm at 500 W. You receive the cabinet in plush black carpet with the gloss black acrylic insert, the side-mounted pre-wired terminal cup and a threaded insert kit with stainless machine screws.

Same series, same size

Other Performance Optimized models