Machete MF-15 D4

15″ subwoofer · dual 4 Ω · 800 W RMS

Fs 35 HzQts 0.78Vas 2.32 ft³Xmax 0.59″

Recommended box

For a sedan, one sub, 800 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 volume2.83 ft³ (80 L)
Qtc1.05
Fc47 Hz
F3 (−3 dB, no cabin gain)38 Hz
Example box (outside)31 1/2″ × 17 11/16″ × 12″
Open sealed box in designer

Ported

Net volume4.80 ft³ (136 L)
Tuning (Fb)33 Hz
Portslot 2 15/16 × 16 5/16″, 18 7/8″ long
Port velocity at 800 W65 ft/s
F3 (−3 dB, no cabin gain)27 Hz
Example box (outside)31 1/2″ × 17 11/16″ × 21 1/8″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs35 Hz
Qts0.78
Qes0.897
Qms6
Vas2.32 ft³
Re (one coil)≈ 3.4 Ω
Sd≈ 124 in²
Xmax0.59″
EBP39 — suits sealed calc.
Sensitivity, 1 W / 1 m87 dB calc.

General

Size15″
Voice coilsdual 4 Ω
RMS power800 W

Mounting dimensions

Ø≈ 15 1/8″cutout Ø13 15/16″mounting depth 7 3/16″magnet Ø≈ 9 1/16″
Cutout diameter13 15/16″
Mounting depth7 3/16″

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 15″ models