Sundown Audio Zv5-15 D2

15″ subwoofer · dual 2 Ω · 2,000 W RMS

27.4 HzFs, resonance

0.45Qts

2.37 ft³Vas

1.38″Xmax

2,000 WRMS

Source	web.archive.org · manufacturer data
Checked against source	October 2026
Thiele/Small parameters	complete
Mounting dimensions	3 of 4 — missing: magnet diameter; the designer will use an estimate

Recommended box

For a sedan, one sub, 2,000 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

smaller, tighter

1.70 ft³ (48 L)

Net volume

Bass character (Qtc)	Flat and accurate · 0.69
Fc	42 Hz
F3 (−3 dB, no cabin gain)	45 Hz
Example box (outside)	16 15/16″ × 16 15/16″ × 14 7/8″

Open sealed box in designer

Ported

deeper, louder

1.91 ft³ (54 L)

Net volume

Tuning (Fb)	30 Hz
Port	slot 1 15/16 × 16 5/16″, 45 5/16″ long
Port velocity at 2,000 W	85 ft/s
F3 (−3 dB, no cabin gain)	30 Hz
Example box (outside)	31 1/2″ × 17 11/16″ × 12 5/8″

At 2,000 W this example’s port will be noisy: air speed 85 ft/s, while the limit is 82 ft/s. It stays quiet up to about 1,850 W. Full power needs a port of at least 33.1 in², which means a bigger box than this example — size it in the designer.

The volume and tuning are the recommendation, but the port doesn’t fit this example box. Size the box and port in the designer.

Open ported box in designer

Deeper: 3.53 ft³ (100 L) tuned to 27 Hz, 31 1/2″ × 17 11/16″ × 22 9/16″ outside — a bigger box with flatter deep bass. Open in the calculator

Where to buy Amazon

Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Size	15″
Voice coils	dual 2 Ω
RMS power	2,000 W
Fs	27.4 Hz
Qts	0.45
Qes	0.5
Qms	4.27
Vas	2.37 ft³

Re (one coil)	2 Ω
Sd	112.5 in²
Xmax	1.38″
Vd	155 in³ calc.
Mms	376 g calc.
BL	16.1 T·m calc.
EBP	55 — sealed or ported calc.
Sensitivity, 1 W / 1 m	86.4 dB calc.

Mounting dimensions

Cutout diameter	13 13/16″
Mounting depth	12 7/16″
Overall diameter	15 1/2″

Cone area (Sd) calculated from Fs, Vas and Mms: 112.5 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 15″ models

Sundown Audio Ev2-15 D2 15″ · dual 2 Ω
Sundown Audio Ev2-15 D4 15″ · dual 4 Ω
Sundown Audio Ev4-15 D2 15″ · dual 2 Ω
Sundown Audio Ev4-15 D4 15″ · dual 4 Ω
Sundown Audio M15 D1 15″ · dual 1 Ω
Sundown Audio M15 D2 15″ · dual 2 Ω
Sundown Audio NSv1-15 D2 15″ · dual 2 Ω
Sundown Audio NSv2-15 D2 15″ · dual 2 Ω
Sundown Audio NSv4-15 D1 15″ · dual 1 Ω
Sundown Audio NSv4-15 D2 15″ · dual 2 Ω
Sundown Audio NSv6-15 D1 15″ · dual 1 Ω
Sundown Audio NSv6-15 D2 15″ · dual 2 Ω

Similar 15″ subwoofers from other brands

Close in Fs, Qts and Vas — a box of similar volume will suit them.

Fi Audio BTL4 15 D2 1.27 ft³ sealed · 2.01 ft³ ported
Fi Audio BTL4 15 D1 1.27 ft³ sealed · 2.01 ft³ ported
Fi Audio SP4 15 D1 1.62 ft³ sealed · 2.01 ft³ ported
Fi Audio SP415 v2.1 D1 1.59 ft³ sealed · 2.01 ft³ ported
Fi Audio SP4 15 D2 1.62 ft³ sealed · 2.01 ft³ ported
Fi Audio SP415 v2.1 D2 1.59 ft³ sealed · 2.01 ft³ ported

FAQ

What box does the Sundown Audio Zv5-15 D2 need?

Recommended net volume: 1.70 ft³ sealed, 1.91 ft³ ported tuned to 30 Hz — for one sub in a sedan at 2,000 W. Fit the box to your space and amp in the free calculator, with plans and a cut sheet.

What are the Sundown Audio Zv5-15 D2 Thiele/Small specs?

Fs 27.4 Hz, Qts 0.45, Vas 2.37 ft³, Xmax 1.38″, Sd 112.5 in².

What is the Sundown Audio Zv5-15 D2 mounting depth?

Mounting depth is 12 7/16″, cutout diameter 13 13/16″. The inside depth of the box must exceed the mounting depth by at least 1″.

How much power does the Sundown Audio Zv5-15 D2 handle and how do I wire it?

RMS power rating: 2,000 W. Dual 2 Ω voice coils: series gives 4 Ω, parallel gives 1 Ω at the amp. Wiring for several subs and amp power — in the wiring calculator.