DC Audio XL-SPL 18 D1

18″ subwoofer · dual 1 Ω · 2,200 W RMS

Fs 32.3 HzQts 0.53Vas 5.10 ft³Xmax 1.02″

Recommended box

For a sedan, one sub, 2,200 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 volume4.03 ft³ (114 L)
Qtc0.80
Fc49 Hz
F3 (−3 dB, no cabin gain)46 Hz
Example box (outside)31 1/2″ × 20 7/8″ × 14 1/8″
Open sealed box in designer

Ported

Net volume6.96 ft³ (197 L)
Tuning (Fb)33 Hz
Portslot 5 1/8 × 19 7/16″, 26 7/8″ long
Port velocity at 2,200 W66 ft/s
F3 (−3 dB, no cabin gain)30 Hz
Example box (outside)31 1/2″ × 20 7/8″ × 27 3/4″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs32.3 Hz
Qts0.53
Qes0.548
Qms17.6
Vas5.10 ft³
Re (one coil)≈ 0.85 Ω
Sd179.6 in²
Xmax1.02″
Vd183.9 in³ calc.
Mms320 g calc.
BL10 T·m calc.
EBP59 — sealed or ported calc.
Sensitivity, 1 W / 1 m91.5 dB calc.

General

Size18″
Voice coilsdual 1 Ω
RMS power2,200 W

Mounting dimensions

Ø18 1/2″cutout Ø16 3/4″mounting depth 11 1/4″magnet Ø≈ 10 7/8″
Cutout diameter16 3/4″
Mounting depth11 1/4″
Overall diameter18 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 DC Audio 18″ models