American Bass ES-1244

12″ subwoofer · dual 4 Ω · 800 W RMS

Fs 32.5 HzQts 1.08Vas 1.19 ft³Xmax 0.45″
The published specs don’t add up:

Recommended box

For a sedan, one sub, 800 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 volume1.77 ft³ (50 L)
Qtc1.40
Fc42 Hz
F3 (−3 dB, no cabin gain)31 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 8 15/16″
Open sealed box in designer

Ported

Net volume3.00 ft³ (85 L)
Tuning (Fb)32 Hz
Portslot 2 9/16 × 14 5/16″, 26 7/8″ long
Port velocity at 800 W63 ft/s
F3 (−3 dB, no cabin gain)25 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 16 5/8″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs32.5 Hz
Qts1.08
Qes1.239
Qms8.61
Vas1.19 ft³
Re (one coil)1.07 Ω
Sd77.9 in²
Xmax0.45″
Vd35.3 in³ calc.
Mms254 g calc.
BL6.7 T·m calc.
EBP26 — suits sealed calc.
Sensitivity, 1 W / 1 m81.7 dB calc.

General

Size12″
Voice coilsdual 4 Ω
RMS power800 W

Mounting dimensions

Ø12 5/8″cutout Ø10 13/16″mounting depth 4 5/16″magnet Ø6 5/16″
Cutout diameter10 13/16″
Mounting depth4 5/16″
Overall diameter12 5/8″
Magnet diameter6 5/16″

“≈” 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