URAL Decibel 12 (1+1)

12″ subwoofer · dual 1 Ω · 3,500 W RMS

Fs 24.1 HzQts 0.42Vas 1.34 ft³Xmax 1.54″

Recommended box

For a sedan, one sub, 3,500 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)
Qtc0.75
Fc42 Hz
F3 (−3 dB, no cabin gain)43 Hz
Example box (outside)14 3/16″ × 14 3/16″ × 9 5/16″
Open sealed box in designer

Ported

Net volume1.70 ft³ (48 L)
Tuning (Fb)25 Hz
Port2 round ports Ø2 1/2″, 23 5/16″ long
Port velocity at 3,500 W356 ft/s
F3 (−3 dB, no cabin gain)23 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 9 3/8″
Open ported box in designer
2030405060801001502006066727884HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs24.1 Hz
Qts0.42
Qes0.46
Qms5.39
Vas1.34 ft³
Re (one coil)≈ 0.85 Ω
Sd69.5 in²
Xmax1.54″
Vd106.8 in³ calc.
Mms328 g calc.
BL9.6 T·m calc.
EBP52 — sealed or ported calc.
Sensitivity, 1 W / 1 m82.6 dB calc.

General

Size12″
Voice coilsdual 1 Ω
RMS power3,500 W

Mounting dimensions

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

Cone area (Sd) calculated from Fs, Vas and Mms: 69.5 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