Sundown Audio NSv5-18 D2

18″ subwoofer · dual 2 Ω · 3,000 W RMS

Fs 28.8 HzQts 0.42Vas 3.16 ft³

Recommended box

For a sedan, one sub, 3,000 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 volume1.62 ft³ (46 L)
Qtc0.72
Fc49 Hz
F3 (−3 dB, no cabin gain)52 Hz
Example box (outside)19 11/16″ × 19 11/16″ × 11 5/16″
Open sealed box in designer

Ported

Net volume3.85 ft³ (109 L)
Tuning (Fb)30 Hz
Portslot 4 1/2 × 19 1/16″, 58 7/8″ long
Port velocity at 3,000 W63 ft/s
F3 (−3 dB, no cabin gain)28 Hz
Example box (outside)31 1/2″ × 20 1/2″ × 23 3/4″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs28.8 Hz
Qts0.42
Qes0.447
Qms6.24
Vas3.16 ft³
Re (one coil)1.81 Ω
Sd177 in²
Xmax≈ 0.39″
Mms630 g calc.
BL21.5 T·m calc.
EBP64 — sealed or ported calc.
Sensitivity, 1 W / 1 m88.8 dB calc.

General

Size18″
Voice coilsdual 2 Ω
RMS power3,000 W

Mounting dimensions

Ø≈ 17 11/16″cutout ≈ Ø16 9/16″mounting depth ≈ 8 1/4″magnet Ø≈ 10 3/4″
Cutout diameter≈ 16 9/16″
Mounting depth≈ 8 1/4″

Cone area (Sd) calculated from Fs, Vas and Mms: 177 in².

“≈” 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 Sundown Audio 18″ models