Swat SW R12D4

12″ subwoofer · dual 4 Ω · 400 W RMS

Fs 45.2 HzQts 1.17Vas 1.52 ft³

Recommended box

For a sedan, one sub, 400 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 volume1.73 ft³ (49 L)
Qtc1.60
Fc62 Hz
F3 (−3 dB, no cabin gain)44 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 8 3/4″
Open sealed box in designer

Ported

Net volume2.93 ft³ (83 L)
Tuning (Fb)47 Hz
Portslot 1 3/4 × 14 5/16″, 6 5/16″ long
Port velocity at 400 W61 ft/s
F3 (−3 dB, no cabin gain)37 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 14 1/16″
Open ported box in designer
2030405060801001502007278849096102HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs45.2 Hz
Qts1.17
Qes1.772
Qms3.45
Vas1.52 ft³
Re (one coil)≈ 3.4 Ω
Sd≈ 76 in²
Xmax≈ 0.39″
EBP26 — suits sealed calc.
Sensitivity, 1 W / 1 m85.5 dB calc.

General

Size12″
Voice coilsdual 4 Ω
RMS power400 W

Mounting dimensions

Ø12 3/16″cutout Ø11″mounting depth 5 5/16″magnet Ø≈ 7 3/16″
Cutout diameter11″
Mounting depth5 5/16″
Overall diameter12 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 12″ models