MD.Lab SW-C12

12″ subwoofer · 4 Ω · 350 W RMS

Fs 25.1 HzQts 0.20Vas 2.75 ft³

Recommended box

For a sedan, one sub, 350 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 volume0.71 ft³ (20 L)
Qtc0.45
Fc56 Hz
F3 (−3 dB, no cabin gain)103 Hz
Example box (outside)14 3/16″ × 14 3/16″ × 10 1/16″
Open sealed box in designer

Ported

Net volume1.45 ft³ (41 L)
Tuning (Fb)31 Hz
Portslot 1 9/16 × 14 5/16″, 39 7/16″ long
Port velocity at 350 W50 ft/s
F3 (−3 dB, no cabin gain)87 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 10 1/2″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs25.1 Hz
Qts0.20
Qes0.233
Qms1.57
Vas2.75 ft³
Re3.8 Ω
Sd76.2 in²
Xmax≈ 0.39″
Mms176 g calc.
BL21.3 T·m calc.
EBP108 — suits ported calc.
Sensitivity, 1 W / 1 m89.3 dB calc.

General

Size12″
Voice coils4 Ω
RMS power350 W

Mounting dimensions

Ø12 7/16″cutout Ø11 3/16″mounting depth 5 7/8″magnet Ø≈ 7 1/4″
Cutout diameter11 3/16″
Mounting depth5 7/8″
Overall diameter12 7/16″

Cone area (Sd) calculated from Fs, Vas and Mms: 76.2 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