Sundown Audio Zv3-18 D2
18″ subwoofer · dual 2 Ω · 1,500 W RMS
| 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, 1,500 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
smaller, tighter| Bass character (Qtc) | Tight and punchy · 0.80 |
|---|---|
| Fc | 48 Hz |
| F3 (−3 dB, no cabin gain) | 45 Hz |
| Example box (outside) | 19 11/16″ × 19 11/16″ × 17 1/8″ |
Ported
deeper, louder| Tuning (Fb) | 34 Hz |
|---|---|
| Port | slot 2 9/16 × 19 1/16″, 31 13/16″ long |
| Port velocity at 1,500 W | 62 ft/s |
| F3 (−3 dB, no cabin gain) | 33 Hz |
| Example box (outside) | 24 11/16″ × 20 1/2″ × 18 1/2″ |
Deeper: 7.31 ft³ (207 L) tuned to 28 Hz, 31 1/2″ × 20 1/2″ × 29 1/4″ outside — a bigger box with flatter deep bass. Open in the calculator
Projects with this subwoofer
Boxes that users designed and published: plans, cut sheet and response graph.
Thiele/Small parameters
| Size | 18″ |
|---|---|
| Voice coils | dual 2 Ω |
| RMS power | 1,500 W |
| Fs | 31.9 Hz |
| Qts | 0.54 |
| Qes | 0.6 |
| Qms | 5 |
| Vas | 3.41 ft³ |
| Re (one coil) | 2 Ω |
|---|---|
| Sd | 188.7 in² |
| Xmax | 1.18″ |
| Vd | 222.9 in³ calc. |
| Mms | 541 g calc. |
| BL | 19 T·m calc. |
| EBP | 53 — sealed or ported calc. |
| Sensitivity, 1 W / 1 m | 89.2 dB calc. |
Mounting dimensions
| Cutout diameter | 16 11/16″ |
|---|---|
| Mounting depth | 11 1/4″ |
| Overall diameter | 18 7/16″ |
Cone area (Sd) calculated from Fs, Vas and Mms: 188.7 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
- web.archive.org/web/20161229105411/http://sundownaudio.com/index.php/subwoofers/
- web.archive.org/web/20150216021305/http://www.sundownaudio.com/index.php/product
Other Sundown Audio 18″ models
- Sundown Audio Inhuman-18 D1 18″ · dual 1 Ω
- Sundown Audio M18 D1 18″ · dual 1 Ω
- Sundown Audio M18 D2 18″ · dual 2 Ω
- Sundown Audio NSv1-18 D1 18″ · dual 1 Ω
- Sundown Audio NSv2-18 D2 18″ · dual 2 Ω
- Sundown Audio NSv4-18 D1 18″ · dual 1 Ω
- Sundown Audio NSv4-18 D2 18″ · dual 2 Ω
- Sundown Audio NSv5-18 D1 18″ · dual 1 Ω
- Sundown Audio NSv5-18 D2 18″ · dual 2 Ω
- Sundown Audio NSv6-18 D1 18″ · dual 1 Ω
- Sundown Audio NSv6-18 D2 18″ · dual 2 Ω
- Sundown Audio SAv2-18 D2 18″ · dual 2 Ω
Similar 18″ subwoofers from other brands
Close in Fs, Qts and Vas — a box of similar volume will suit them.
- American Bass GF-1822 2.68 ft³ sealed · 2.79 ft³ ported
- American Bass GF-1811 2.40 ft³ sealed · 2.83 ft³ ported
- American Bass VFLCOMP-1822 2.12 ft³ sealed · 2.75 ft³ ported
- Fi Audio MT 18 D2 2.38 ft³ sealed · 3.00 ft³ ported
- Fi Audio TEAM 18 D2 2.30 ft³ sealed · 3.00 ft³ ported
- Fi Audio TEAM v2 18 D2 2.38 ft³ sealed · 3.00 ft³ ported
FAQ
What box does the Sundown Audio Zv3-18 D2 need?
Recommended net volume: 2.75 ft³ sealed, 3.00 ft³ ported tuned to 34 Hz — for one sub in a sedan at 1,500 W. Fit the box to your space and amp in the free calculator, with plans and a cut sheet.
What are the Sundown Audio Zv3-18 D2 Thiele/Small specs?
Fs 31.9 Hz, Qts 0.54, Vas 3.41 ft³, Xmax 1.18″, Sd 188.7 in².
What is the Sundown Audio Zv3-18 D2 mounting depth?
Mounting depth is 11 1/4″, cutout diameter 16 11/16″. The inside depth of the box must exceed the mounting depth by at least 1″.
How much power does the Sundown Audio Zv3-18 D2 handle and how do I wire it?
RMS power rating: 1,500 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.