American Bass XR-1244

12″ subwoofer · dual 4 Ω · 1,200 W RMS

Fs 36.3 HzQts 0.75Vas 0.58 ft³Xmax 0.66″
The published specs don’t add up:

Recommended box

For a sedan, one sub, 1,200 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 volume1.17 ft³ (33 L)
Qtc0.92
Fc44 Hz
F3 (−3 dB, no cabin gain)38 Hz
Example box (outside)14 15/16″ × 14 15/16″ × 13 3/8″
Open sealed box in designer

Ported

Net volume2.51 ft³ (71 L)
Tuning (Fb)26 Hz
Portslot 2 9/16 × 14 5/16″, 52 13/16″ long
Port velocity at 1,200 W78 ft/s
F3 (−3 dB, no cabin gain)22 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 17 3/8″
Open ported box in designer
2030405060801001502006066727884HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs36.3 Hz
Qts0.75
Qes0.81
Qms9.66
Vas0.58 ft³
Re (one coil)3.32 Ω
Sd64.4 in²
Xmax0.66″
Vd42.6 in³ calc.
Mms284 g calc.
BL16.3 T·m calc.
EBP45 — suits sealed calc.
Sensitivity, 1 W / 1 m81.9 dB calc.

General

Size12″
Voice coilsdual 4 Ω
RMS power1,200 W

Mounting dimensions

Ø≈ 12 13/16″cutout Ø11 5/8″mounting depth 7 3/4″magnet Ø≈ 7 9/16″
Cutout diameter11 5/8″
Mounting depth7 3/4″

“≈” 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