Machete MF-15S D4

15″ subwoofer · dual 4 Ω · 800 W RMS

Fs 29 HzQts 0.79Vas 2.78 ft³Xmax 0.55″

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)
Qtc1.11
Fc41 Hz
F3 (−3 dB, no cabin gain)32 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)30 Hz
Portslot 2 3/4 × 16 5/16″, 22 1/4″ long
Port velocity at 800 W62 ft/s
F3 (−3 dB, no cabin gain)25 Hz
Example box (outside)31 1/2″ × 17 11/16″ × 21 3/8″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs29 Hz
Qts0.79
Qes0.91
Qms6
Vas2.78 ft³
Re (one coil)≈ 3.4 Ω
Sd≈ 124 in²
Xmax0.55″
EBP32 — suits sealed calc.
Sensitivity, 1 W / 1 m85.2 dB calc.

General

Size15″
Voice coilsdual 4 Ω
RMS power800 W

Mounting dimensions

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

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