Fi Audio Q12 D2

12″ subwoofer · dual 2 Ω · 1,750 W RMS

Fs 32.7 HzQts 0.39Vas 1.06 ft³Xmax 1.34″

Recommended box

For a sedan, one sub, 1,750 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)
Qtc0.63
Fc52 Hz
F3 (−3 dB, no cabin gain)63 Hz
Example box (outside)14 3/16″ × 14 3/16″ × 9 11/16″
Open sealed box in designer

Ported

Net volume1.41 ft³ (40 L)
Tuning (Fb)32 Hz
Portslot 1 3/4 × 14 5/16″, 42 3/4″ long
Port velocity at 1,750 W105 ft/s
F3 (−3 dB, no cabin gain)30 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 10 7/8″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs32.7 Hz
Qts0.39
Qes0.41
Qms7.85
Vas1.06 ft³
Re (one coil)1.8 Ω
Sd74.4 in²
Xmax1.34″
Vd99.6 in³ calc.
Mms259 g calc.
BL15.3 T·m calc.
EBP80 — sealed or ported calc.
Sensitivity, 1 W / 1 m86.1 dB calc.

General

Size12″
Voice coilsdual 2 Ω
RMS power1,750 W

Mounting dimensions

Ø12 1/2″cutout Ø11 1/8″mounting depth 7 1/4″magnet Ø≈ 7 1/4″
Cutout diameter11 1/8″
Mounting depth7 1/4″
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 Fi Audio 12″ models