AMPIRE BOLD124

12″ subwoofer · dual 4 Ω · 1,000 W RMS

Fs 42.8 HzQts 0.50Vas 0.89 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)
Qtc0.76
Fc65 Hz
F3 (−3 dB, no cabin gain)64 Hz
Example box (outside)14 3/16″ × 14 3/16″ × 9 11/16″
Open sealed box in designer

Ported

Net volume1.84 ft³ (52 L)
Tuning (Fb)37 Hz
Portslot 2 9/16 × 14 5/16″, 34″ long
Port velocity at 1,000 W65 ft/s
F3 (−3 dB, no cabin gain)33 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 12 3/4″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs42.8 Hz
Qts0.50
Qes0.58
Qms3.58
Vas0.89 ft³
Re (one coil)3.8 Ω
Sd71.3 in²
Xmax0.63″
Vd44.9 in³ calc.
Mms164 g calc.
BL17 T·m calc.
EBP74 — sealed or ported calc.
Sensitivity, 1 W / 1 m87.3 dB calc.

General

Size12″
Voice coilsdual 4 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