URAL TT 15 (2+2)

15″ subwoofer · dual 2 Ω · 500 W RMS

Fs 26.3 HzQts 0.78Vas 3.17 ft³Xmax 0.79″

Recommended box

For a sedan, one sub, 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 volume2.44 ft³ (69 L)
Qtc1.19
Fc40 Hz
F3 (−3 dB, no cabin gain)31 Hz
Example box (outside)31 1/2″ × 17 11/16″ × 10 5/8″
Open sealed box in designer

Ported

Net volume4.17 ft³ (118 L)
Tuning (Fb)31 Hz
Portslot 1 15/16 × 16 5/16″, 16 3/4″ long
Port velocity at 500 W60 ft/s
F3 (−3 dB, no cabin gain)26 Hz
Example box (outside)31 1/2″ × 17 11/16″ × 18 1/8″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs26.3 Hz
Qts0.78
Qes0.99
Qms3.78
Vas3.17 ft³
Re (one coil)≈ 1.7 Ω
Sd107.3 in²
Xmax0.79″
Vd84.5 in³ calc.
Mms277 g calc.
BL8.9 T·m calc.
EBP27 — suits sealed calc.
Sensitivity, 1 W / 1 m84.2 dB calc.

General

Size15″
Voice coilsdual 2 Ω
RMS power500 W

Mounting dimensions

Ø15 3/16″cutout Ø13 7/8″mounting depth 7 3/8″magnet Ø6 1/8″
Cutout diameter13 7/8″
Mounting depth7 3/8″
Overall diameter15 3/16″
Magnet diameter6 1/8″

Cone area (Sd) calculated from Fs, Vas and Mms: 107.3 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