Swat MAS-12

12″ subwoofer · 4 Ω · 300 W RMS

Fs 36.2 HzQts 0.68Vas 1.37 ft³Xmax 0.55″

Recommended box

For a sedan, one sub, 300 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)
Qtc0.92
Fc49 Hz
F3 (−3 dB, no cabin gain)41 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)33 Hz
Portslot 1 3/4 × 14 5/16″, 17 1/8″ long
Port velocity at 300 W61 ft/s
F3 (−3 dB, no cabin gain)28 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 14 7/8″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs36.2 Hz
Qts0.68
Qes0.768
Qms6.2
Vas1.37 ft³
Re3.3 Ω
Sd76.1 in²
Xmax0.55″
Vd41.9 in³ calc.
Mms169 g calc.
BL12.9 T·m calc.
EBP47 — suits sealed calc.
Sensitivity, 1 W / 1 m85.8 dB calc.

General

Size12″
Voice coils4 Ω
RMS power300 W

Mounting dimensions

Ø≈ 12 5/16″cutout Ø11 1/8″mounting depth 5 3/8″magnet Ø≈ 7 3/16″
Cutout diameter11 1/8″
Mounting depth5 3/8″

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

“≈” 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