Mac Audio STX 12 Reference

12″ subwoofer · 4 Ω · 1,000 W RMS

Fs 22 HzQts 0.23Vas 4.10 ft³Xmax 1.02″

Recommended box

For a sedan, one sub, 1,000 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)
Qtc0.61
Fc57 Hz
F3 (−3 dB, no cabin gain)72 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)32 Hz
Portslot 1 3/4 × 14 5/16″, 41 5/8″ long
Port velocity at 1,000 W71 ft/s
F3 (−3 dB, no cabin gain)36 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 10 7/8″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs22 Hz
Qts0.23
Qes0.25
Qms3.56
Vas4.10 ft³
Re3.3 Ω
Sd≈ 76 in²
Xmax1.02″
EBP88 — sealed or ported calc.
Sensitivity, 1 W / 1 m88.9 dB calc.

General

Size12″
Voice coils4 Ω
RMS power1,000 W

Mounting dimensions

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

“≈” 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 Mac Audio 12″ models