DC Audio Level 4 M3 18 D1

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

Fs 26.4 HzQts 0.70Vas 6.19 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 volume4.31 ft³ (122 L)
Qtc1.10
Fc41 Hz
F3 (−3 dB, no cabin gain)33 Hz
Example box (outside)31 1/2″ × 20 7/8″ × 15″
Open sealed box in designer

Ported

Net volume7.31 ft³ (207 L)
Tuning (Fb)31 Hz
Portslot 3 15/16 × 19 7/16″, 21 15/16″ long
Port velocity at 1,500 W62 ft/s
F3 (−3 dB, no cabin gain)27 Hz
Example box (outside)31 1/2″ × 20 7/8″ × 27 1/8″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs26.4 Hz
Qts0.70
Qes0.746
Qms11.82
Vas6.19 ft³
Re (one coil)≈ 0.85 Ω
Sd188.6 in²
Xmax0.93″
Vd174.5 in³ calc.
Mms435 g calc.
BL9.1 T·m calc.
EBP35 — suits sealed calc.
Sensitivity, 1 W / 1 m88.4 dB calc.

General

Size18″
Voice coilsdual 1 Ω
RMS power1,500 W

Mounting dimensions

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