Lanzar MAX12

12″ subwoofer · 4 Ω

Fs 35.1 HzQts 0.36Vas 3.46 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 volume0.88 ft³ (25 L)
Qtc0.80
Fc78 Hz
F3 (−3 dB, no cabin gain)75 Hz
Example box (outside)14 3/16″ × 14 3/16″ × 11 15/16″
Open sealed box in designer

Ported

Net volume2.75 ft³ (78 L)
Tuning (Fb)40 Hz
Portslot 1 3/4 × 14 5/16″, 11 1/4″ long
Port velocity at 300 W63 ft/s
F3 (−3 dB, no cabin gain)40 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 13 3/4″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs35.1 Hz
Qts0.36
Qes0.383
Qms6
Vas3.46 ft³
Re≈ 3.4 Ω
Sd≈ 76 in²
Xmax≈ 0.39″
EBP92 — sealed or ported calc.
Sensitivity, 1 W / 1 m92.4 dB calc.

General

Size12″
Voice coils4 Ω
RMS power—

Mounting dimensions

Ø12 1/8″cutout ≈ Ø10 7/8″mounting depth 6 3/4″magnet Ø≈ 7 1/16″
Cutout diameter≈ 10 7/8″
Mounting depth6 3/4″
Overall diameter12 1/8″

Only Qts is published — Qms assumed to be 6 and Qes calculated (barely affects box design).

“≈” 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 Lanzar 12″ models