Kicx HeadShot DM18 (2+2)

18″ subwoofer · dual 2 Ω · 4,000 W RMS

Fs 50 HzQts 1.02Vas 1.54 ft³

Recommended box

For a sedan, one sub, 4,000 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 volume3.07 ft³ (87 L)
Qtc1.25
Fc61 Hz
F3 (−3 dB, no cabin gain)46 Hz
Example box (outside)20 1/16″ × 20 1/16″ × 18 1/16″
Open sealed box in designer

Ported

Net volume6.99 ft³ (198 L)
Tuning (Fb)37 Hz
Portslot 5 7/8 × 19 7/16″, 23 1/4″ long
Port velocity at 4,000 W87 ft/s
F3 (−3 dB, no cabin gain)30 Hz
Example box (outside)31 1/2″ × 20 7/8″ × 27 13/16″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs50 Hz
Qts1.02
Qes1.17
Qms8.18
Vas1.54 ft³
Re (one coil)1.9 Ω
Sd180.6 in²
Xmax≈ 0.39″
Mms448 g calc.
BL15.1 T·m calc.
EBP43 — suits sealed calc.
Sensitivity, 1 W / 1 m88.7 dB calc.

General

Size18″
Voice coilsdual 2 Ω
RMS power4,000 W

Mounting dimensions

Ø18 11/16″cutout Ø16 3/4″mounting depth 11 5/8″magnet Ø≈ 10 7/8″
Cutout diameter16 3/4″
Mounting depth11 5/8″
Overall diameter18 11/16″

“≈” 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 Kicx 18″ models