MD.Lab SW-B12F

12″ subwoofer · 4 Ω · 300 W RMS

Fs 42.8 HzQts 1.29Vas 1.35 ft³

Recommended box

For a sedan, one sub, 300 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 volume1.91 ft³ (54 L)
Qtc1.68
Fc56 Hz
F3 (−3 dB, no cabin gain)39 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 9 1/2″
Open sealed box in designer

Ported

Net volume3.25 ft³ (92 L)
Tuning (Fb)42 Hz
Portslot 1 3/4 × 14 5/16″, 7 11/16″ long
Port velocity at 300 W62 ft/s
F3 (−3 dB, no cabin gain)32 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 15 7/16″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs42.8 Hz
Qts1.29
Qes1.57
Qms7.2
Vas1.35 ft³
Re3.4 Ω
Sd83.8 in²
Xmax≈ 0.39″
Mms150 g calc.
BL9.3 T·m calc.
EBP27 — suits sealed calc.
Sensitivity, 1 W / 1 m84.8 dB calc.

General

Size12″
Voice coils4 Ω
RMS power300 W

Mounting dimensions

Ø12 3/16″cutout Ø11 1/4″mounting depth 6 1/4″magnet Ø≈ 7 5/16″
Cutout diameter11 1/4″
Mounting depth6 1/4″
Overall diameter12 3/16″

Cone area (Sd) calculated from Fs, Vas and Mms: 83.8 in².

“≈” 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 MD.Lab 12″ models