Fi Audio Delta 15 D1

15″ subwoofer · dual 1 Ω

Fs 36.4 HzQts 0.34Vas 1.43 ft³Xmax 1.34″

Recommended box

For a sedan, one sub, 300 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 volume1.66 ft³ (47 L)
Qtc0.47
Fc50 Hz
F3 (−3 dB, no cabin gain)87 Hz
Example box (outside)17 5/16″ × 17 5/16″ × 13 15/16″
Open sealed box in designer

Ported

Net volume2.40 ft³ (68 L)
Tuning (Fb)32 Hz
Port2 round ports Ø2 1/2″, 9″ long
Port velocity at 300 W151 ft/s
F3 (−3 dB, no cabin gain)31 Hz
Example box (outside)23 5/16″ × 18 1/8″ × 14″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs36.4 Hz
Qts0.34
Qes0.36
Qms7.02
Vas1.43 ft³
Re (one coil)0.7 Ω
Sd125.6 in²
Xmax1.34″
Vd168.1 in³ calc.
Mms440 g calc.
BL14 T·m calc.
EBP101 — suits ported calc.
Sensitivity, 1 W / 1 m89.3 dB calc.

General

Size15″
Voice coilsdual 1 Ω
RMS power—

Mounting dimensions

Ø15 5/8″cutout Ø14 1/8″mounting depth 11 1/2″magnet Ø≈ 9 3/16″
Cutout diameter14 1/8″
Mounting depth11 1/2″
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