URAL Patriot 12 (2+2)

12″ subwoofer · dual 2 Ω · 1,500 W RMS

Fs 27.2 HzQts 0.32Vas 0.97 ft³Xmax 0.98″

Recommended box

For a sedan, one sub, 1,500 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 volume0.64 ft³ (18 L)
Qtc0.51
Fc43 Hz
F3 (−3 dB, no cabin gain)67 Hz
Example box (outside)14 3/16″ × 14 3/16″ × 9 5/16″
Open sealed box in designer

Ported

Net volume1.34 ft³ (38 L)
Tuning (Fb)26 Hz
Port2 round ports Ø2 1/2″, 27 9/16″ long
Port velocity at 1,500 W222 ft/s
F3 (−3 dB, no cabin gain)25 Hz
Example box (outside)29 3/4″ × 15 3/4″ × 8 7/16″
Open ported box in designer
2030405060801001502006066727884HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs27.2 Hz
Qts0.32
Qes0.35
Qms3.97
Vas0.97 ft³
Re (one coil)≈ 1.7 Ω
Sd69.7 in²
Xmax0.98″
Vd68.6 in³ calc.
Mms355 g calc.
BL17.2 T·m calc.
EBP78 — sealed or ported calc.
Sensitivity, 1 W / 1 m84 dB calc.

General

Size12″
Voice coilsdual 2 Ω
RMS power1,500 W

Mounting dimensions

Ø≈ 12 5/16″cutout ≈ Ø11 1/8″mounting depth ≈ 5 7/8″magnet Ø6 11/16″
Cutout diameter≈ 11 1/8″
Mounting depth≈ 5 7/8″
Magnet diameter6 11/16″

Cone area (Sd) calculated from Fs, Vas and Mms: 69.7 in².

“≈” 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