Sundown Audio NSv1-18 D1
18″ subwoofer · dual 1 Ω · 1,500 W RMS
| Source | web.archive.org · manufacturer data |
|---|---|
| Checked against source | October 2026 |
| Thiele/Small parameters | not in the spec sheet: Sd, 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, 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 | 51 Hz |
| F3 (−3 dB, no cabin gain) | 48 Hz |
| Example box (outside) | 19 11/16″ × 19 11/16″ × 16 1/4″ |
Ported
deeper, louder| Tuning (Fb) | 34 Hz |
|---|---|
| Port | slot 2 9/16 × 19 1/16″, 33 3/16″ long |
| Port velocity at 1,500 W | 64 ft/s |
| F3 (−3 dB, no cabin gain) | 34 Hz |
| Example box (outside) | 24 7/8″ × 20 1/2″ × 18 1/8″ |
Deeper: 6.99 ft³ (198 L) tuned to 29 Hz, 31 1/2″ × 20 1/2″ × 28 5/8″ 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 1 Ω |
| RMS power | 1,500 W |
| Fs | 35 Hz |
| Qts | 0.55 |
| Qes | 0.58 |
| Qms | 9.9 |
| Vas | 2.93 ft³ |
|---|---|
| Re (one coil) | 1.05 Ω |
| Sd | ≈ 180.6 in² |
| Xmax | ≈ 0.39″ |
| EBP | 60 — sealed or ported calc. |
| Sensitivity, 1 W / 1 m | 89.9 dB calc. |
Mounting dimensions
| Cutout diameter | 16 9/16″ |
|---|---|
| Mounting depth | 11″ |
| Overall diameter | 18 1/2″ |
“≈” 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
- 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 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
- Sundown Audio SAv2-18 D4 18″ · dual 4 Ω
Similar 18″ subwoofers from other brands
Close in Fs, Qts and Vas — a box of similar volume will suit them.
- American Bass VFLCOMP-1822 2.12 ft³ sealed · 2.75 ft³ ported
- Hifonics ZXT18D2 4.10 ft³ sealed · 2.86 ft³ ported
- American Bass GF-1822 2.68 ft³ sealed · 2.79 ft³ ported
- Kicker Solo-Baric L7XS 18" 2-Ohm DVC (52L7XS182) 2.15 ft³ sealed · 3.74 ft³ ported
- Ascendant Audio Mayhem 18 D2 1.70 ft³ sealed · 3.00 ft³ ported
- Ascendant Audio Mayhem 18 D1 1.70 ft³ sealed · 3.00 ft³ ported
FAQ
What box does the Sundown Audio NSv1-18 D1 need?
Recommended net volume: 2.58 ft³ sealed, 2.90 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 NSv1-18 D1 Thiele/Small specs?
Fs 35 Hz, Qts 0.55, Vas 2.93 ft³.
What is the Sundown Audio NSv1-18 D1 mounting depth?
Mounting depth is 11″, cutout diameter 16 9/16″. The inside depth of the box must exceed the mounting depth by at least 1″.
How much power does the Sundown Audio NSv1-18 D1 handle and how do I wire it?
RMS power rating: 1,500 W. Dual 1 Ω voice coils: series gives 2 Ω, parallel gives 0.5 Ω at the amp. Wiring for several subs and amp power — in the wiring calculator.