Sundown Audio NSv4-15 D2
15″ subwoofer · dual 2 Ω · 3,000 W RMS
| Source | web.archive.org · manufacturer data |
|---|---|
| Checked against source | October 2026 |
| Thiele/Small parameters | not in the spec sheet: Xmax — typical value for the size used |
| Mounting dimensions | 3 of 4 — missing: magnet diameter; the designer will use an estimate |
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
smaller, tighter| Bass character (Qtc) | Dry and tight · 0.47 |
|---|---|
| Fc | 45 Hz |
| F3 (−3 dB, no cabin gain) | 77 Hz |
| Example box (outside) | 16 15/16″ × 16 15/16″ × 15 3/4″ |
Ported
deeper, louder| Tuning (Fb) | 34 Hz |
|---|---|
| Port | slot 5 11/16 × 16 5/16″, 56 3/16″ long |
| Port velocity at 3,000 W | 65 ft/s |
| F3 (−3 dB, no cabin gain) | 30 Hz |
| Example box (outside) | 31 1/2″ × 17 11/16″ × 25 3/8″ |
Deeper: 2.15 ft³ (61 L) tuned to 30 Hz, 22 15/16″ × 17 11/16″ × 20 1/2″ 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 | 15″ |
|---|---|
| Voice coils | dual 2 Ω |
| RMS power | 3,000 W |
| Fs | 34.7 Hz |
| Qts | 0.37 |
| Qes | 0.398 |
| Qms | 4.59 |
| Vas | 1.23 ft³ |
| Re (one coil) | 1.44 Ω |
|---|---|
| Sd | 113.2 in² |
| Xmax | ≈ 0.39″ |
| Mms | 457 g calc. |
| BL | 19 T·m calc. |
| EBP | 87 — sealed or ported calc. |
| Sensitivity, 1 W / 1 m | 87.6 dB calc. |
Mounting dimensions
| Cutout diameter | 13 13/16″ |
|---|---|
| Mounting depth | 13 1/4″ |
| Overall diameter | 15 1/2″ |
Cone area (Sd) calculated from Fs, Vas and Mms: 113.2 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/20191212161612/https://sundownaudio.com/index.php/products/s
- web.archive.org/web/20210425002706/https://sundownaudio.com/lv/sa/subwoofers/ns-
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 NSv6-15 D1 15″ · dual 1 Ω
- Sundown Audio NSv6-15 D2 15″ · dual 2 Ω
- Sundown Audio SA Classic 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.
- American Bass VFLCOMP-1511 1.38 ft³ sealed · 1.94 ft³ ported
- SPL Dynamics SPL-380D2 1.22 ft³ sealed · 3.67 ft³ ported
- Fi Audio Delta 15 D1 1.66 ft³ sealed · 3.71 ft³ ported
- Fi Audio Delta 15 D2 1.66 ft³ sealed · 3.71 ft³ ported
- Audioque HDC415-D1-A 1.17 ft³ sealed · 3.18 ft³ ported
- DC Audio NEO 3.0 15 D0.7 1.29 ft³ sealed · 3.64 ft³ ported
FAQ
What box does the Sundown Audio NSv4-15 D2 need?
Recommended net volume: 1.82 ft³ sealed, 3.35 ft³ ported tuned to 34 Hz — for one sub in a sedan at 3,000 W. Fit the box to your space and amp in the free calculator, with plans and a cut sheet.
What are the Sundown Audio NSv4-15 D2 Thiele/Small specs?
Fs 34.7 Hz, Qts 0.37, Vas 1.23 ft³, Sd 113.2 in².
What is the Sundown Audio NSv4-15 D2 mounting depth?
Mounting depth is 13 1/4″, 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 NSv4-15 D2 handle and how do I wire it?
RMS power rating: 3,000 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.