DC Audio Level 4 18 D4

18″ subwoofer · dual 4 Ω · 1,500 W RMS

Fs 34 HzQts 0.94Vas 3.14 ft³Xmax 0.93″

Recommended box

For a sedan, one sub, 1,500 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 volume4.17 ft³ (118 L)
Qtc1.24
Fc45 Hz
F3 (−3 dB, no cabin gain)34 Hz
Example box (outside)31 1/2″ × 20 7/8″ × 14 9/16″
Open sealed box in designer

Ported

Net volume7.06 ft³ (200 L)
Tuning (Fb)33 Hz
Portslot 4 1/8 × 19 7/16″, 20 9/16″ long
Port velocity at 1,500 W64 ft/s
F3 (−3 dB, no cabin gain)26 Hz
Example box (outside)31 1/2″ × 20 7/8″ × 26 5/16″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs34 Hz
Qts0.94
Qes1.044
Qms9
Vas3.14 ft³
Re (one coil)≈ 3.4 Ω
Sd182.6 in²
Xmax0.93″
Vd168.9 in³ calc.
Mms483 g calc.
BL18.3 T·m calc.
EBP33 — suits sealed calc.
Sensitivity, 1 W / 1 m87.3 dB calc.

General

Size18″
Voice coilsdual 4 Ω
RMS power1,500 W

Mounting dimensions

Ø18 1/2″cutout Ø16 3/4″mounting depth 9″magnet Ø≈ 10 7/8″
Cutout diameter16 3/4″
Mounting depth9″
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