DS18 GEN-X154D

15″ subwoofer · dual 4 Ω · 500 W RMS

Fs 38 HzQts 0.77Vas 1.74 ft³Xmax 0.70″
The published specs don’t add up:

Recommended box

For a sedan, one sub, 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 volume2.83 ft³ (80 L)
Qtc0.98
Fc48 Hz
F3 (−3 dB, no cabin gain)40 Hz
Example box (outside)31 1/2″ × 18 1/8″ × 11 3/4″
Open sealed box in designer

Ported

Net volume4.84 ft³ (137 L)
Tuning (Fb)32 Hz
Portslot 2 3/8 × 16 11/16″, 16 1/16″ long
Port velocity at 500 W65 ft/s
F3 (−3 dB, no cabin gain)27 Hz
Example box (outside)31 1/2″ × 18 1/8″ × 20 1/4″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs38 Hz
Qts0.77
Qes0.88
Qms6.34
Vas1.74 ft³
Re (one coil)3.2 Ω
Sd124.7 in²
Xmax0.70″
Vd87.4 in³ calc.
Mms325 g calc.
BL16.8 T·m calc.
EBP43 — suits sealed calc.
Sensitivity, 1 W / 1 m86.9 dB calc.

General

Size15″
Voice coilsdual 4 Ω
RMS power500 W

Mounting dimensions

Ø15 9/16″cutout Ø14″mounting depth 7 5/8″magnet Ø≈ 9 1/8″
Cutout diameter14″
Mounting depth7 5/8″
Overall diameter15 9/16″

“≈” 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 DS18 15″ models