Fi Audio BTL-NEO15 D2

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

Fs 32.8 HzQts 0.29Vas 2.33 ft³Xmax 1.34″

Recommended box

For a sedan, one sub, 2,500 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 volume1.62 ft³ (46 L)
Qtc0.45
Fc51 Hz
F3 (−3 dB, no cabin gain)95 Hz
Example box (outside)17 5/16″ × 17 5/16″ × 13 3/4″
Open sealed box in designer

Ported

Net volume2.40 ft³ (68 L)
Tuning (Fb)33 Hz
Portslot 3 3/8 × 16 11/16″, 50 15/16″ long
Port velocity at 2,500 W78 ft/s
F3 (−3 dB, no cabin gain)34 Hz
Example box (outside)31 1/2″ × 18 1/8″ × 16 7/8″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs32.8 Hz
Qts0.29
Qes0.3
Qms6.61
Vas2.33 ft³
Re (one coil)1.8 Ω
Sd125.6 in²
Xmax1.34″
Vd168.1 in³ calc.
Mms331 g calc.
BL20.2 T·m calc.
EBP109 — suits ported calc.
Sensitivity, 1 W / 1 m90.9 dB calc.

General

Size15″
Voice coilsdual 2 Ω
RMS power2,500 W

Mounting dimensions

Ø15 5/8″cutout Ø14 1/8″mounting depth 11 1/4″magnet Ø≈ 9 3/16″
Cutout diameter14 1/8″
Mounting depth11 1/4″
Overall diameter15 5/8″

“≈” 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