URAL Pobeda 18 (2+2)

18″ subwoofer · dual 2 Ω · 1,200 W RMS

Fs 25.5 HzQts 0.73Vas 6.04 ft³Xmax 1.06″

Recommended box

For a sedan, one sub, 1,200 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 volume4.20 ft³ (119 L)
Qtc1.14
Fc40 Hz
F3 (−3 dB, no cabin gain)31 Hz
Example box (outside)31 1/2″ × 20 1/2″ × 14 15/16″
Open sealed box in designer

Ported

Net volume7.13 ft³ (202 L)
Tuning (Fb)31 Hz
Portslot 3 3/8 × 19 1/16″, 18 1/4″ long
Port velocity at 1,200 W64 ft/s
F3 (−3 dB, no cabin gain)26 Hz
Example box (outside)31 1/2″ × 20 1/2″ × 26 1/8″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs25.5 Hz
Qts0.73
Qes0.84
Qms5.72
Vas6.04 ft³
Re (one coil)≈ 1.7 Ω
Sd183.9 in²
Xmax1.06″
Vd195.5 in³ calc.
Mms454 g calc.
BL12.1 T·m calc.
EBP30 — suits sealed calc.
Sensitivity, 1 W / 1 m87.3 dB calc.

General

Size18″
Voice coilsdual 2 Ω
RMS power1,200 W

Mounting dimensions

Ø18 7/16″cutout Ø16 5/8″mounting depth 8 1/4″magnet Ø≈ 10 13/16″
Cutout diameter16 5/8″
Mounting depth8 1/4″
Overall diameter18 7/16″

Cone area (Sd) calculated from Fs, Vas and Mms: 183.9 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 18″ models