MD.Lab SW-A12

12″ subwoofer · dual 4 Ω · 600 W RMS

Fs 31.3 HzQts 0.45Vas 1.75 ft³
The published specs don’t add up:

Recommended box

For a sedan, one sub, 600 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 volume0.85 ft³ (24 L)
Qtc0.80
Fc55 Hz
F3 (−3 dB, no cabin gain)52 Hz
Example box (outside)14 3/16″ × 14 3/16″ × 11 9/16″
Open sealed box in designer

Ported

Net volume2.72 ft³ (77 L)
Tuning (Fb)30 Hz
Portslot 2 3/16 × 14 5/16″, 29 5/16″ long
Port velocity at 600 W62 ft/s
F3 (−3 dB, no cabin gain)27 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 15 7/16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs31.3 Hz
Qts0.45
Qes0.578
Qms2.13
Vas1.75 ft³
Re (one coil)3.6 Ω
Sd≈ 76 in²
Xmax≈ 0.39″
EBP54 — sealed or ported calc.
Sensitivity, 1 W / 1 m86.2 dB calc.

General

Size12″
Voice coilsdual 4 Ω
RMS power600 W

Mounting dimensions

Ø12 3/8″cutout Ø11 1/8″mounting depth 8″magnet Ø≈ 7 1/4″
Cutout diameter11 1/8″
Mounting depth8″
Overall diameter12 3/8″

Judging by its value, the published Re is for both coils in parallel — converted to per coil.

“≈” 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