American Bass XD-1244

12″ subwoofer · dual 4 Ω · 500 W RMS

Fs 40 HzQts 0.69Vas 1.07 ft³Xmax 0.45″

Recommended box

For a sedan, one sub, 500 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 volume1.84 ft³ (52 L)
Qtc0.87
Fc50 Hz
F3 (−3 dB, no cabin gain)44 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 9 3/16″
Open sealed box in designer

Ported

Net volume3.11 ft³ (88 L)
Tuning (Fb)32 Hz
Portslot 2 3/8 × 14 5/16″, 23 5/8″ long
Port velocity at 500 W62 ft/s
F3 (−3 dB, no cabin gain)27 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 16 9/16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs40 Hz
Qts0.69
Qes0.799
Qms5.12
Vas1.07 ft³
Re (one coil)≈ 3.4 Ω
Sd79.9 in²
Xmax0.45″
Vd35.8 in³ calc.
Mms196 g calc.
BL14.5 T·m calc.
EBP50 — sealed or ported calc.
Sensitivity, 1 W / 1 m85.9 dB calc.

General

Size12″
Voice coilsdual 4 Ω
RMS power500 W

Mounting dimensions

Ø≈ 12 1/2″cutout Ø11 5/16″mounting depth 6 9/16″magnet Ø≈ 7 3/8″
Cutout diameter11 5/16″
Mounting depth6 9/16″

Cone area (Sd) calculated from Fs, Vas and Mms: 79.9 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 American Bass 12″ models