URAL Decibel 15 (1+1)

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

Fs 22.1 HzQts 0.46Vas 3.96 ft³Xmax 1.61″

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 volume1.91 ft³ (54 L)
Qtc0.80
Fc39 Hz
F3 (−3 dB, no cabin gain)37 Hz
Example box (outside)17 5/16″ × 17 5/16″ × 15 5/8″
Open sealed box in designer

Ported

Net volume4.63 ft³ (131 L)
Tuning (Fb)25 Hz
Portslot 5 5/16 × 16 11/16″, 74 1/4″ long
Port velocity at 3,500 W64 ft/s
F3 (−3 dB, no cabin gain)23 Hz
Example box (outside)31 1/2″ × 18 1/8″ × 32 3/8″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs22.1 Hz
Qts0.46
Qes0.5
Qms5.11
Vas3.96 ft³
Re (one coil)≈ 0.85 Ω
Sd119.5 in²
Xmax1.61″
Vd192.9 in³ calc.
Mms390 g calc.
BL9.6 T·m calc.
EBP44 — suits sealed calc.
Sensitivity, 1 W / 1 m85.8 dB calc.

General

Size15″
Voice coilsdual 1 Ω
RMS power3,500 W

Mounting dimensions

Ø≈ 15 3/16″cutout ≈ Ø14″mounting depth ≈ 7 1/16″magnet Ø≈ 9 1/16″
Cutout diameter≈ 14″
Mounting depth≈ 7 1/16″

Cone area (Sd) calculated from Fs, Vas and Mms: 119.5 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 15″ models