Swat SW R15D4

15″ subwoofer · dual 4 Ω · 500 W RMS

Fs 42 HzQts 0.77Vas 1.11 ft³

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 volume2.22 ft³ (63 L)
Qtc0.94
Fc51 Hz
F3 (−3 dB, no cabin gain)43 Hz
Example box (outside)31 1/2″ × 18 1/8″ × 9 11/16″
Open sealed box in designer

Ported

Net volume4.80 ft³ (136 L)
Tuning (Fb)30 Hz
Portslot 1 15/16 × 16 11/16″, 15 9/16″ long
Port velocity at 500 W65 ft/s
F3 (−3 dB, no cabin gain)25 Hz
Example box (outside)31 1/2″ × 18 1/8″ × 19 7/8″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs42 Hz
Qts0.77
Qes1.41
Qms1.68
Vas1.11 ft³
Re (one coil)≈ 3.4 Ω
Sd≈ 124 in²
Xmax≈ 0.39″
EBP30 — suits sealed calc.
Sensitivity, 1 W / 1 m84.2 dB calc.

General

Size15″
Voice coilsdual 4 Ω
RMS power500 W

Mounting dimensions

Ø15 3/16″cutout Ø14″mounting depth 6 5/16″magnet Ø≈ 9 1/16″
Cutout diameter14″
Mounting depth6 5/16″
Overall diameter15 3/16″

“≈” 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