URAL AK-12

12″ subwoofer · 4 Ω

Fs 33 HzQts 0.45Vas 1.99 ft³Xmax 0.39″

Recommended box

For a sedan, one sub, 300 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 volume0.88 ft³ (25 L)
Qtc0.80
Fc60 Hz
F3 (−3 dB, no cabin gain)56 Hz
Example box (outside)14 9/16″ × 14 9/16″ × 11 5/16″
Open sealed box in designer

Ported

Net volume2.93 ft³ (83 L)
Tuning (Fb)32 Hz
Portslot 1 3/4 × 14 5/16″, 18 7/16″ long
Port velocity at 300 W60 ft/s
F3 (−3 dB, no cabin gain)30 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 15″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs33 Hz
Qts0.45
Qes0.49
Qms4.87
Vas1.99 ft³
Re3.3 Ω
Sd≈ 76 in²
Xmax0.39″
EBP67 — sealed or ported calc.
Sensitivity, 1 W / 1 m88.2 dB calc.

General

Size12″
Voice coils4 Ω
RMS power—

Mounting dimensions

Ø≈ 12 3/8″cutout Ø11 1/4″mounting depth 6 5/16″magnet Ø6 1/8″
Cutout diameter11 1/4″
Mounting depth6 5/16″
Magnet diameter6 1/8″

“≈” 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