MTX Audio 3512-04

12″ subwoofer · 4 Ω · 250 W RMS

Fs 31.4 HzQts 0.70Vas 2.58 ft³Xmax 0.32″
The published specs don’t add up:

Recommended box

For a sedan, one sub, 250 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 volume2.01 ft³ (57 L)
Qtc1.05
Fc47 Hz
F3 (−3 dB, no cabin gain)38 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 9 15/16″
Open sealed box in designer

Ported

Net volume3.46 ft³ (98 L)
Tuning (Fb)34 Hz
Portslot 1 9/16 × 14 5/16″, 11 1/8″ long
Port velocity at 250 W58 ft/s
F3 (−3 dB, no cabin gain)29 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 16 1/2″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs31.4 Hz
Qts0.70
Qes0.893
Qms3.17
Vas2.58 ft³
Re3.5 Ω
Sd88.9 in²
Xmax0.32″
Vd28.4 in³ calc.
Mms164 g calc.
BL11.3 T·m calc.
EBP35 — suits sealed calc.
Sensitivity, 1 W / 1 m86 dB calc.

General

Size12″
Voice coils4 Ω
RMS power250 W

Mounting dimensions

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

“≈” 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