Fi Audio Xv4 15 D2

15″ subwoofer · dual 2 Ω · 1,500 W RMS

Fs 39.3 HzQts 0.55Vas 1.41 ft³Xmax 1.06″

Recommended box

For a sedan, one sub, 1,500 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 volume1.27 ft³ (36 L)
Qtc0.80
Fc57 Hz
F3 (−3 dB, no cabin gain)54 Hz
Example box (outside)16 15/16″ × 16 15/16″ × 11 13/16″
Open sealed box in designer

Ported

Net volume3.85 ft³ (109 L)
Tuning (Fb)31 Hz
Portslot 3 15/16 × 16 5/16″, 39 3/4″ long
Port velocity at 1,500 W65 ft/s
F3 (−3 dB, no cabin gain)28 Hz
Example box (outside)31 1/2″ × 17 11/16″ × 21 1/2″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs39.3 Hz
Qts0.55
Qes0.6
Qms6.84
Vas1.41 ft³
Re (one coil)1.6 Ω
Sd125.6 in²
Xmax1.06″
Vd133.5 in³ calc.
Mms381 g calc.
BL15.8 T·m calc.
EBP66 — sealed or ported calc.
Sensitivity, 1 W / 1 m88.1 dB calc.

General

Size15″
Voice coilsdual 2 Ω
RMS power1,500 W

Mounting dimensions

Ø15 1/2″cutout Ø13 7/8″mounting depth 8 3/8″magnet Ø≈ 9″
Cutout diameter13 7/8″
Mounting depth8 3/8″
Overall diameter15 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 15″ models