Sundown Audio Xv1-15 D4
15″ subwoofer · dual 4 Ω · 1,250 W RMS
| Source | web.archive.org · manufacturer data |
|---|---|
| Checked against source | October 2026 |
| Thiele/Small parameters | complete |
| Mounting dimensions | 2 of 4 — missing: frame outer diameter, magnet diameter; the designer will use an estimate |
Recommended box
For a sedan, one sub, 1,250 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 · 0.81 |
|---|---|
| Fc | 34 Hz |
| F3 (−3 dB, no cabin gain) | 31 Hz |
| Example box (outside) | 16 15/16″ × 16 15/16″ × 21 11/16″ |
Ported
deeper, louder| Tuning (Fb) | 30 Hz |
|---|---|
| Port | slot 2 3/8 × 16 5/16″, 39 7/8″ long |
| Port velocity at 1,250 W | 64 ft/s |
| F3 (−3 dB, no cabin gain) | 27 Hz |
| Example box (outside) | 25 5/8″ × 17 11/16″ × 18 1/8″ |
Deeper: 4.52 ft³ (128 L) tuned to 25 Hz, 31 1/2″ × 17 11/16″ × 23 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 | 15″ |
|---|---|
| Voice coils | dual 4 Ω |
| RMS power | 1,250 W |
| Fs | 22.6 Hz |
| Qts | 0.55 |
| Qes | 0.61 |
| Qms | 5.37 |
| Vas | 3.19 ft³ |
| Re (one coil) | 3.05 Ω |
|---|---|
| Sd | 116.3 in² |
| Xmax | 1.18″ |
| Vd | 137.4 in³ calc. |
| Mms | 438 g calc. |
| BL | 17.6 T·m calc. |
| EBP | 37 — suits sealed calc. |
| Sensitivity, 1 W / 1 m | 84.3 dB calc. |
Mounting dimensions
| Cutout diameter | 13 13/16″ |
|---|---|
| Mounting depth | 10 7/8″ |
Cone area (Sd) calculated from Fs, Vas and Mms: 116.3 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/20190807034628/http://sundownaudio.com/index.php/products/di
- web.archive.org/web/20210125011608/https://sundownaudio.com/lv/sa/discontinued/d
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.
- Sky High Car Audio BMX-15 D1 2.15 ft³ sealed · 2.58 ft³ ported
- Diamond D615D2 2.30 ft³ sealed · 2.51 ft³ ported
- Lanzar OPTI1532D 2.83 ft³ sealed · 2.51 ft³ ported
- Diamond H154 2.37 ft³ sealed · 2.93 ft³ ported
- Diamond HXP154 1.59 ft³ sealed · 2.40 ft³ ported
- Sky High Car Audio BMX-15 D2 1.80 ft³ sealed · 2.68 ft³ ported
FAQ
What box does the Sundown Audio Xv1-15 D4 need?
Recommended net volume: 2.65 ft³ sealed, 2.54 ft³ ported tuned to 30 Hz — for one sub in a sedan at 1,250 W. Fit the box to your space and amp in the free calculator, with plans and a cut sheet.
What are the Sundown Audio Xv1-15 D4 Thiele/Small specs?
Fs 22.6 Hz, Qts 0.55, Vas 3.19 ft³, Xmax 1.18″, Sd 116.3 in².
What is the Sundown Audio Xv1-15 D4 mounting depth?
Mounting depth is 10 7/8″, 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 Xv1-15 D4 handle and how do I wire it?
RMS power rating: 1,250 W. Dual 4 Ω voice coils: series gives 8 Ω, parallel gives 2 Ω at the amp. Wiring for several subs and amp power — in the wiring calculator.