AMPIRE BOLD122

12″ subwoofer · dual 2 Ω · 1,000 W RMS

Fs 40.1 HzQts 0.48Vas 0.78 ft³Xmax 0.63″

Recommended box

For a sedan, one sub, 1,000 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 volume0.67 ft³ (19 L)
Qtc0.71
Fc59 Hz
F3 (−3 dB, no cabin gain)62 Hz
Example box (outside)14 3/16″ × 14 3/16″ × 9 11/16″
Open sealed box in designer

Ported

Net volume1.45 ft³ (41 L)
Tuning (Fb)35 Hz
Portslot 2 3/16 × 14 5/16″, 42 3/16″ long
Port velocity at 1,000 W68 ft/s
F3 (−3 dB, no cabin gain)32 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 11 1/2″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs40.1 Hz
Qts0.48
Qes0.54
Qms4.46
Vas0.78 ft³
Re (one coil)2.1 Ω
Sd71.3 in²
Xmax0.63″
Vd44.9 in³ calc.
Mms214 g calc.
BL14.5 T·m calc.
EBP74 — sealed or ported calc.
Sensitivity, 1 W / 1 m86.2 dB calc.

General

Size12″
Voice coilsdual 2 Ω
RMS power1,000 W

Mounting dimensions

Ø12 5/16″cutout Ø10 7/8″mounting depth 7 3/16″magnet Ø≈ 7 1/16″
Cutout diameter10 7/8″
Mounting depth7 3/16″
Overall diameter12 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 AMPIRE 12″ models