Audio System M 15

15″ subwoofer · 4 Ω · 400 W RMS

Fs 24.4 HzQts 0.55Vas 8.04 ft³Xmax 0.39″

Recommended box

For a sedan, one sub, 400 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)
Qtc1.09
Fc48 Hz
F3 (−3 dB, no cabin gain)38 Hz
Example box (outside)31 1/2″ × 17 5/16″ × 12 1/4″
Open sealed box in designer

Ported

Net volume4.84 ft³ (137 L)
Tuning (Fb)35 Hz
Portslot 1 15/16 × 15 7/8″, 9 1/2″ long
Port velocity at 400 W63 ft/s
F3 (−3 dB, no cabin gain)32 Hz
Example box (outside)31 1/2″ × 17 5/16″ × 20 5/16″
Open ported box in designer
2030405060801001502007278849096102HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs24.4 Hz
Qts0.55
Qes0.61
Qms6.12
Vas8.04 ft³
Re4 Ω
Sd124.6 in²
Xmax0.39″
Vd49.1 in³ calc.
Mms171 g calc.
BL13.1 T·m calc.
EBP40 — suits sealed calc.
Sensitivity, 1 W / 1 m89.3 dB calc.

General

Size15″
Voice coils4 Ω
RMS power400 W

Mounting dimensions

Ø15 3/8″cutout Ø13 7/16″mounting depth 7 1/8″magnet Ø≈ 8 3/4″
Cutout diameter13 7/16″
Mounting depth7 1/8″
Overall diameter15 3/8″

“≈” 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 Audio System 15″ models