MTX Audio T81244A

12″ subwoofer · dual 4 Ω · 400 W RMS

Fs 25.2 HzQts 0.49Vas 3.21 ft³Xmax 0.49″

Recommended box

For a sedan, one sub, 400 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 volume1.91 ft³ (54 L)
Qtc0.81
Fc41 Hz
F3 (−3 dB, no cabin gain)39 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 9 1/2″
Open sealed box in designer

Ported

Net volume3.25 ft³ (92 L)
Tuning (Fb)29 Hz
Portslot 1 3/4 × 14 5/16″, 20 11/16″ long
Port velocity at 400 W66 ft/s
F3 (−3 dB, no cabin gain)26 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 16 7/16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs25.2 Hz
Qts0.49
Qes0.54
Qms5.53
Vas3.21 ft³
Re (one coil)3.68 Ω
Sd83.5 in²
Xmax0.49″
Vd40.8 in³ calc.
Mms181 g calc.
BL14 T·m calc.
EBP47 — suits sealed calc.
Sensitivity, 1 W / 1 m86.3 dB calc.

General

Size12″
Voice coilsdual 4 Ω
RMS power400 W

Mounting dimensions

Ø12 11/16″cutout Ø11″mounting depth 5 5/8″magnet Ø≈ 7 1/8″
Cutout diameter11″
Mounting depth5 5/8″
Overall diameter12 11/16″

“≈” 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 MTX Audio 12″ models