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

12″ subwoofer · dual 2 Ω · 900 W RMS

Fs 26.7 HzQts 0.55Vas 1.67 ft³

Recommended box

For a sedan, one sub, 900 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 volume1.52 ft³ (43 L)
Qtc0.80
Fc39 Hz
F3 (−3 dB, no cabin gain)36 Hz
Example box (outside)14 9/16″ × 14 9/16″ × 17 5/8″
Open sealed box in designer

Ported

Net volume2.93 ft³ (83 L)
Tuning (Fb)26 Hz
Portslot 2 9/16 × 14 5/16″, 44 1/2″ long
Port velocity at 900 W65 ft/s
F3 (−3 dB, no cabin gain)23 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 18 3/16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs26.7 Hz
Qts0.55
Qes0.606
Qms6
Vas1.67 ft³
Re (one coil)≈ 1.7 Ω
Sd≈ 76 in²
Xmax≈ 0.39″
EBP44 — suits sealed calc.
Sensitivity, 1 W / 1 m83.7 dB calc.

General

Size12″
Voice coilsdual 2 Ω
RMS power900 W

Mounting dimensions

Ø≈ 12 3/8″cutout Ø11 1/4″mounting depth 6 13/16″magnet Ø≈ 7 5/16″
Cutout diameter11 1/4″
Mounting depth6 13/16″

Only Qts is published — Qms assumed to be 6 and Qes calculated (barely affects box design).

“≈” 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