MTX Audio 3512-04S

12″ subwoofer · 4 Ω · 300 W RMS

Fs 29.6 HzQts 0.69Vas 2.04 ft³Xmax 0.40″

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 volume1.98 ft³ (56 L)
Qtc0.98
Fc42 Hz
F3 (−3 dB, no cabin gain)35 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 9 3/4″
Open sealed box in designer

Ported

Net volume3.39 ft³ (96 L)
Tuning (Fb)30 Hz
Portslot 1 9/16 × 14 5/16″, 15 7/8″ long
Port velocity at 300 W63 ft/s
F3 (−3 dB, no cabin gain)26 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 16 1/2″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs29.6 Hz
Qts0.69
Qes0.87
Qms3.33
Vas2.04 ft³
Re3.13 Ω
Sd87.3 in²
Xmax0.40″
Vd35.1 in³ calc.
Mms225 g calc.
BL12.3 T·m calc.
EBP34 — suits sealed calc.
Sensitivity, 1 W / 1 m84.4 dB calc.

General

Size12″
Voice coils4 Ω
RMS power300 W

Mounting dimensions

Ø12 5/16″cutout Ø11 1/8″mounting depth 3 3/8″magnet Ø≈ 7 1/4″
Cutout diameter11 1/8″
Mounting depth3 3/8″
Overall diameter12 5/16″

The published Sd of 88.9 in² doesn't match Fs, Vas and Mms — using the calculated 87.3 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 MTX Audio 12″ models