URAL Symphony 12 (2+2)

12″ subwoofer · dual 2 Ω · 600 W RMS

Fs 30.8 HzQts 0.41Vas 1.18 ft³Xmax 0.91″

Recommended box

For a sedan, one sub, 600 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 volume0.71 ft³ (20 L)
Qtc0.67
Fc50 Hz
F3 (−3 dB, no cabin gain)56 Hz
Example box (outside)14 9/16″ × 14 9/16″ × 9 9/16″
Open sealed box in designer

Ported

Net volume1.45 ft³ (41 L)
Tuning (Fb)31 Hz
Portslot 1 3/4 × 14 5/16″, 44 5/8″ long
Port velocity at 600 W59 ft/s
F3 (−3 dB, no cabin gain)29 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 11 1/8″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs30.8 Hz
Qts0.41
Qes0.45
Qms4.79
Vas1.18 ft³
Re (one coil)≈ 1.7 Ω
Sd75.7 in²
Xmax0.91″
Vd68.6 in³ calc.
Mms269 g calc.
BL14 T·m calc.
EBP68 — sealed or ported calc.
Sensitivity, 1 W / 1 m85.4 dB calc.

General

Size12″
Voice coilsdual 2 Ω
RMS power600 W

Mounting dimensions

Ø12 1/2″cutout Ø11 1/4″mounting depth 6 7/16″magnet Ø7 1/16″
Cutout diameter11 1/4″
Mounting depth6 7/16″
Overall diameter12 1/2″
Magnet diameter7 1/16″

Cone area (Sd) calculated from Fs, Vas and Mms: 75.7 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