AMPIRE VLEX12.4

12″ subwoofer · 4 Ω · 350 W RMS

Fs 33.5 HzQts 0.38Vas 2.01 ft³Xmax 0.55″

Recommended box

For a sedan, one sub, 350 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 volume0.71 ft³ (20 L)
Qtc0.74
Fc66 Hz
F3 (−3 dB, no cabin gain)67 Hz
Example box (outside)14 3/16″ × 14 3/16″ × 10 1/16″
Open sealed box in designer

Ported

Net volume1.80 ft³ (51 L)
Tuning (Fb)37 Hz
Portslot 1 9/16 × 14 5/16″, 20 9/16″ long
Port velocity at 350 W58 ft/s
F3 (−3 dB, no cabin gain)36 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 10 1/2″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs33.5 Hz
Qts0.38
Qes0.42
Qms3.52
Vas2.01 ft³
Re3.3 Ω
Sd79.1 in²
Xmax0.55″
Vd43.6 in³ calc.
Mms147 g calc.
BL15.6 T·m calc.
EBP80 — sealed or ported calc.
Sensitivity, 1 W / 1 m89.1 dB calc.

General

Size12″
Voice coils4 Ω
RMS power350 W

Mounting dimensions

Ø12 1/2″cutout Ø10 15/16″mounting depth 5 1/2″magnet Ø≈ 7 1/8″
Cutout diameter10 15/16″
Mounting depth5 1/2″
Overall diameter12 1/2″

“≈” 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