MD.Lab SW-B12E

12″ subwoofer · 4 Ω · 200 W RMS

Fs 43.6 HzQts 0.66Vas 1.12 ft³

Recommended box

For a sedan, one sub, 200 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 volume1.77 ft³ (50 L)
Qtc0.84
Fc56 Hz
F3 (−3 dB, no cabin gain)50 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 8 15/16″
Open sealed box in designer

Ported

Net volume3.00 ft³ (85 L)
Tuning (Fb)36 Hz
Portslot 1 9/16 × 14 5/16″, 11 9/16″ long
Port velocity at 200 W62 ft/s
F3 (−3 dB, no cabin gain)31 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 14 11/16″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs43.6 Hz
Qts0.66
Qes0.73
Qms6.54
Vas1.12 ft³
Re3.6 Ω
Sd77.7 in²
Xmax≈ 0.39″
Mms150 g calc.
BL14.2 T·m calc.
EBP60 — sealed or ported calc.
Sensitivity, 1 W / 1 m87.6 dB calc.

General

Size12″
Voice coils4 Ω
RMS power200 W

Mounting dimensions

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

Cone area (Sd) calculated from Fs, Vas and Mms: 77.7 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