RE Audio SEX15 D4 v2

15″ subwoofer · dual 4 Ω · 750 W RMS

Fs 31.5 HzQts 0.74Vas 2.52 ft³

Recommended box

For a sedan, one sub, 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 volume2.90 ft³ (82 L)
Qtc1.01
Fc43 Hz
F3 (−3 dB, no cabin gain)35 Hz
Example box (outside)31 1/2″ × 18 1/8″ × 12″
Open sealed box in designer

Ported

Net volume4.91 ft³ (139 L)
Tuning (Fb)31 Hz
Portslot 2 3/4 × 16 11/16″, 20 7/16″ long
Port velocity at 750 W63 ft/s
F3 (−3 dB, no cabin gain)26 Hz
Example box (outside)31 1/2″ × 18 1/8″ × 21 1/8″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs31.5 Hz
Qts0.74
Qes0.839
Qms6.09
Vas2.52 ft³
Re (one coil)2.77 Ω
Sd127 in²
Xmax≈ 0.39″
Mms339 g calc.
BL14.9 T·m calc.
EBP38 — suits sealed calc.
Sensitivity, 1 W / 1 m86.3 dB calc.

General

Size15″
Voice coilsdual 4 Ω
RMS power750 W

Mounting dimensions

Ø15 1/2″cutout Ø14″mounting depth 7 13/16″magnet Ø≈ 9 1/8″
Cutout diameter14″
Mounting depth7 13/16″
Overall diameter15 1/2″

Judging by its value, the published Re is for both coils in parallel — converted to per coil.

“≈” 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 RE Audio 15″ models