Sundown Audio Zv4-12 D2

12″ subwoofer · dual 2 Ω · 1,750 W RMS

33 HzFs, resonance

0.42Qts

0.76 ft³Vas

1.38″Xmax

1,750 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, 1,750 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

1.01 ft³ (28.5 L)

Net volume

Bass character (Qtc)	Dry and tight · 0.55
Fc	44 Hz
F3 (−3 dB, no cabin gain)	61 Hz
Example box (outside)	14 3/16″ × 14 3/16″ × 13 1/4″

Open sealed box in designer

Ported

deeper, louder

1.17 ft³ (33 L)

Net volume

Tuning (Fb)	35 Hz
Port	slot 1 9/16 × 14 5/16″, 38 5/16″ long
Port velocity at 1,750 W	115 ft/s
F3 (−3 dB, no cabin gain)	31 Hz
Example box (outside)	31 1/2″ × 15 3/4″ × 9 1/4″

At 1,750 W this example’s port will be noisy: air speed 115 ft/s, while the limit is 82 ft/s. It stays quiet up to about 890 W. Full power needs a port of at least 31.5 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: 1.38 ft³ (39 L) tuned to 29 Hz, 31 1/2″ × 15 3/4″ × 12 5/16″ 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	12″
Voice coils	dual 2 Ω
RMS power	1,750 W
Fs	33 Hz
Qts	0.42
Qes	0.45
Qms	5.74
Vas	0.76 ft³

Re (one coil)	1.8 Ω
Sd	72.8 in²
Xmax	1.38″
Vd	100.3 in³ calc.
Mms	339 g calc.
BL	16.8 T·m calc.
EBP	73 — sealed or ported calc.
Sensitivity, 1 W / 1 m	84.3 dB calc.

Mounting dimensions

Cutout diameter	11 1/8″
Mounting depth	10 13/16″
Overall diameter	12 11/16″

Cone area (Sd) calculated from Fs, Vas and Mms: 72.8 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 12″ models

Sundown Audio Ev2-12 D2 12″ · dual 2 Ω
Sundown Audio Ev2-12 D4 12″ · dual 4 Ω
Sundown Audio Ev4-12 D2 12″ · dual 2 Ω
Sundown Audio Ev4-12 D4 12″ · dual 4 Ω
Sundown Audio HZ-12 D4 12″ · dual 4 Ω
Sundown Audio HZS-12 D4 12″ · dual 4 Ω
Sundown Audio LCSv1-12 D4 12″ · dual 4 Ω
Sundown Audio LCSv2-12 D4 12″ · dual 4 Ω
Sundown Audio M12 D1 12″ · dual 1 Ω
Sundown Audio M12 D2 12″ · dual 2 Ω
Sundown Audio NSv1-12 D2 12″ · dual 2 Ω
Sundown Audio NSv2-12 D2 12″ · dual 2 Ω

Similar 12″ subwoofers from other brands

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

Fi Audio NEO 4.7 12 D1 0.94 ft³ sealed · 1.20 ft³ ported
Fi Audio NEO 4.7 12 D2 0.94 ft³ sealed · 1.20 ft³ ported
Memphis Car Audio MJ1212 (MOJO 12", 2ohm setting) 0.79 ft³ sealed · 1.20 ft³ ported
Phoenix Gold ZMAX122 (DVC 2 ohm) 0.71 ft³ sealed · 2.33 ft³ ported
Memphis Car Audio MJ1212 (MOJO 12", 1ohm setting) 0.79 ft³ sealed · 1.20 ft³ ported
Ascendant Audio Havoc 12 D1 0.67 ft³ sealed · 1.20 ft³ ported

FAQ

What box does the Sundown Audio Zv4-12 D2 need?

Recommended net volume: 1.01 ft³ sealed, 1.17 ft³ ported tuned to 35 Hz — for one sub in a sedan at 1,750 W. Fit the box to your space and amp in the free calculator, with plans and a cut sheet.

What are the Sundown Audio Zv4-12 D2 Thiele/Small specs?

Fs 33 Hz, Qts 0.42, Vas 0.76 ft³, Xmax 1.38″, Sd 72.8 in².

What is the Sundown Audio Zv4-12 D2 mounting depth?

Mounting depth is 10 13/16″, cutout diameter 11 1/8″. The inside depth of the box must exceed the mounting depth by at least 1″.

How much power does the Sundown Audio Zv4-12 D2 handle and how do I wire it?

RMS power rating: 1,750 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.