American Bass XO-1244

12″ subwoofer · dual 4 Ω · 300 W RMS

Fs 36.2 HzQts 0.64Vas 1.31 ft³Xmax 0.47″
The published specs don’t add up:

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 volume1.80 ft³ (51 L)
Qtc0.84
Fc48 Hz
F3 (−3 dB, no cabin gain)43 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 9 1/16″
Open sealed box in designer

Ported

Net volume3.07 ft³ (87 L)
Tuning (Fb)32 Hz
Portslot 1 3/4 × 14 5/16″, 17 7/16″ long
Port velocity at 300 W60 ft/s
F3 (−3 dB, no cabin gain)28 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 15 1/2″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs36.2 Hz
Qts0.64
Qes0.78
Qms3.62
Vas1.31 ft³
Re (one coil)3.4 Ω
Sd79.1 in²
Xmax0.47″
Vd37.3 in³ calc.
Mms191 g calc.
BL13.8 T·m calc.
EBP46 — suits sealed calc.
Sensitivity, 1 W / 1 m85.6 dB calc.

General

Size12″
Voice coilsdual 4 Ω
RMS power300 W

Mounting dimensions

Ø≈ 12 5/16″cutout Ø11 1/8″mounting depth 5 9/16″magnet Ø≈ 7 3/16″
Cutout diameter11 1/8″
Mounting depth5 9/16″

“≈” 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 American Bass 12″ models