Swat SBT-15

15″ subwoofer · dual 2 Ω · 650 W RMS

Fs 27 HzQts 0.48Vas 4.31 ft³Xmax 0.71″

Recommended box

For a sedan, one sub, 650 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)
Qtc0.80
Fc45 Hz
F3 (−3 dB, no cabin gain)43 Hz
Example box (outside)31 1/2″ × 18 1/8″ × 10 7/16″
Open sealed box in designer

Ported

Net volume4.73 ft³ (134 L)
Tuning (Fb)30 Hz
Portslot 2 9/16 × 16 11/16″, 21 7/16″ long
Port velocity at 650 W63 ft/s
F3 (−3 dB, no cabin gain)27 Hz
Example box (outside)31 1/2″ × 18 1/8″ × 20 1/2″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs27 Hz
Qts0.48
Qes0.512
Qms7.62
Vas4.31 ft³
Re (one coil)1.9 Ω
Sd122.5 in²
Xmax0.71″
Vd86.8 in³ calc.
Mms252 g calc.
BL12.6 T·m calc.
EBP53 — sealed or ported calc.
Sensitivity, 1 W / 1 m88.7 dB calc.

General

Size15″
Voice coilsdual 2 Ω
RMS power650 W

Mounting dimensions

Ø≈ 15 1/4″cutout Ø14 1/16″mounting depth 7 9/16″magnet Ø≈ 9 1/8″
Cutout diameter14 1/16″
Mounting depth7 9/16″

Qes and Qms are not on the spec sheet — calculated from Qts, motor strength BL and Re.

Judging by its value, the published Re is for both coils in series — converted to per coil.

“≈” 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 Swat 15″ models