Fi Audio NEO 4.9 12 D2

12″ subwoofer · dual 2 Ω · 3,500 W RMS

Fs 34.2 HzQts 0.35Vas 0.68 ft³Xmax 1.34″

Recommended box

For a sedan, one sub, 3,500 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 volume0.94 ft³ (26.5 L)
Qtc0.46
Fc45 Hz
F3 (−3 dB, no cabin gain)80 Hz
Example box (outside)14 3/16″ × 14 3/16″ × 12 1/2″
Open sealed box in designer

Ported

Net volume1.41 ft³ (40 L)
Tuning (Fb)28 Hz
Port2 round ports Ø2 1/2″, 22 1/4″ long
Port velocity at 3,500 W385 ft/s
F3 (−3 dB, no cabin gain)27 Hz
Example box (outside)20 3/16″ × 15 3/4″ × 12 3/8″
Open ported box in designer
2030405060801001502006066727884HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs34.2 Hz
Qts0.35
Qes0.37
Qms6.51
Vas0.68 ft³
Re (one coil)1.4 Ω
Sd74.4 in²
Xmax1.34″
Vd99.6 in³ calc.
Mms366 g calc.
BL17.3 T·m calc.
EBP92 — sealed or ported calc.
Sensitivity, 1 W / 1 m85.2 dB calc.

General

Size12″
Voice coilsdual 2 Ω
RMS power3,500 W

Mounting dimensions

Ø12 1/2″cutout Ø11 1/8″mounting depth 10″magnet Ø≈ 7 1/4″
Cutout diameter11 1/8″
Mounting depth10″
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