Machete MS-12 D4

12″ subwoofer · dual 4 Ω · 250 W RMS

Fs 29.2 HzQts 0.60Vas 2.96 ft³Xmax 0.39″

Recommended box

For a sedan, one sub, 250 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)
Qtc0.99
Fc48 Hz
F3 (−3 dB, no cabin gain)40 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)35 Hz
Portslot 1 9/16 × 14 5/16″, 12 7/8″ long
Port velocity at 250 W57 ft/s
F3 (−3 dB, no cabin gain)31 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 14 1/2″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs29.2 Hz
Qts0.60
Qes0.667
Qms6
Vas2.96 ft³
Re (one coil)3.6 Ω
Sd≈ 76 in²
Xmax0.39″
EBP44 — suits sealed calc.
Sensitivity, 1 W / 1 m87 dB calc.

General

Size12″
Voice coilsdual 4 Ω
RMS power250 W

Mounting dimensions

Ø≈ 12 3/8″cutout Ø11 3/16″mounting depth 5 9/16″magnet Ø≈ 7 1/4″
Cutout diameter11 3/16″
Mounting depth5 9/16″

Only Qts is published — Qms assumed to be 6 and Qes calculated (barely affects box design).

“≈” 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 Machete 12″ models