American Bass KING-1211

12″ subwoofer · dual 1 Ω · 6,500 W RMS

Fs 47.3 HzQts 0.56Vas 0.23 ft³Xmax 0.89″

Recommended box

For a sedan, one sub, 6,500 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 volume1.11 ft³ (31.5 L)
Qtc0.62
Fc52 Hz
F3 (−3 dB, no cabin gain)61 Hz
Example box (outside)14 9/16″ × 14 9/16″ × 13 9/16″
Open sealed box in designer

Ported

Net volume1.48 ft³ (42 L)
Tuning (Fb)27 Hz
Portround port Ø3″, 15 3/16″ long
Port velocity at 6,500 W735 ft/s
F3 (−3 dB, no cabin gain)24 Hz
Example box (outside)18 1/16″ × 15 3/4″ × 13 9/16″
Open ported box in designer
2030405060801001502006066727884HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs47.3 Hz
Qts0.56
Qes0.63
Qms5.33
Vas0.23 ft³
Re (one coil)0.8 Ω
Sd77.2 in²
Xmax0.89″
Vd68.4 in³ calc.
Mms612 g calc.
BL15.2 T·m calc.
EBP75 — sealed or ported calc.
Sensitivity, 1 W / 1 m82.4 dB calc.

General

Size12″
Voice coilsdual 1 Ω
RMS power6,500 W

Mounting dimensions

Ø≈ 12 1/2″cutout Ø11 5/16″mounting depth 11″magnet Ø≈ 7 3/8″
Cutout diameter11 5/16″
Mounting depth11″

“≈” 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