Machete MS-15 D4

15″ subwoofer · dual 4 Ω · 250 W RMS

Fs 31.6 HzQts 0.78Vas 3.75 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 volume2.83 ft³ (80 L)
Qtc1.19
Fc48 Hz
F3 (−3 dB, no cabin gain)37 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)36 Hz
Portslot 1 9/16 × 16 5/16″, 6 13/16″ long
Port velocity at 250 W63 ft/s
F3 (−3 dB, no cabin gain)31 Hz
Example box (outside)31 1/2″ × 17 11/16″ × 19 7/16″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs31.6 Hz
Qts0.78
Qes0.897
Qms6
Vas3.75 ft³
Re (one coil)3.6 Ω
Sd≈ 124 in²
Xmax0.39″
EBP35 — suits sealed calc.
Sensitivity, 1 W / 1 m87.7 dB calc.

General

Size15″
Voice coilsdual 4 Ω
RMS power250 W

Mounting dimensions

Ø≈ 14 15/16″cutout Ø13 3/4″mounting depth 6 9/16″magnet Ø≈ 8 15/16″
Cutout diameter13 3/4″
Mounting depth6 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 15″ models