URAL AS-D12.3D2 (2+2)

12″ subwoofer · dual 2 Ω · 400 W RMS

Fs 29.5 HzQts 0.50Vas 2.10 ft³Xmax 0.46″

Recommended box

For a sedan, one sub, 400 W. It’s the same math as the designer’s step-by-step mode, where you can fit the box to your space, vehicle and amp and get plans, a cut sheet and DXF.

Sealed

Net volume1.38 ft³ (39 L)
Qtc0.80
Fc47 Hz
F3 (−3 dB, no cabin gain)44 Hz
Example box (outside)14 9/16″ × 14 9/16″ × 16 1/4″
Open sealed box in designer

Ported

Net volume2.93 ft³ (83 L)
Tuning (Fb)30 Hz
Portslot 1 15/16 × 14 5/16″, 24 3/16″ long
Port velocity at 400 W61 ft/s
F3 (−3 dB, no cabin gain)27 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 15 5/8″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs29.5 Hz
Qts0.50
Qes0.527
Qms11.6
Vas2.10 ft³
Re (one coil)2.2 Ω
Sd≈ 76 in²
Xmax0.46″
EBP56 — sealed or ported calc.
Sensitivity, 1 W / 1 m86.6 dB calc.

General

Size12″
Voice coilsdual 2 Ω
RMS power400 W

Mounting dimensions

Ø≈ 12 3/8″cutout Ø11 1/4″mounting depth 5 11/16″magnet Ø≈ 7 5/16″
Cutout diameter11 1/4″
Mounting depth5 11/16″

“≈” means the value isn’t in the spec sheet and a typical value for the size is used; “calc.” means it’s calculated from the published parameters. Check the manufacturer’s spec sheet before you build.

Data sources

Other URAL 12″ models