Sundown Audio SA Rev.3-15 D4
15″ subwoofer · dual 4 Ω · 750 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, 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| Bass character (Qtc) | Boomy, with a bump · 0.97 |
|---|---|
| Fc | 48 Hz |
| F3 (−3 dB, no cabin gain) | 39 Hz |
| Example box (outside) | 31 1/2″ × 18 1/8″ × 11 5/8″ |
Ported
deeper, louder| Tuning (Fb) | 34 Hz |
|---|---|
| Port | slot 1 9/16 × 16 11/16″, 27 1/16″ long |
| Port velocity at 750 W | 62 ft/s |
| F3 (−3 dB, no cabin gain) | 34 Hz |
| Example box (outside) | 22 1/4″ × 18 1/8″ × 14 3/4″ |
Deeper: 4.77 ft³ (135 L) tuned to 32 Hz, 31 1/2″ × 18 1/8″ × 20 13/16″ 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 | 750 W |
| Fs | 37 Hz |
| Qts | 0.75 |
| Qes | 0.85 |
| Qms | 6.63 |
| Vas | 1.85 ft³ |
| Re (one coil) | 3.88 Ω |
|---|---|
| Sd | 122.8 in² |
| Xmax | 0.75″ |
| Vd | 91.8 in³ calc. |
| Mms | 315 g calc. |
| BL | 18.3 T·m calc. |
| EBP | 43 — suits sealed calc. |
| Sensitivity, 1 W / 1 m | 86.9 dB calc. |
Mounting dimensions
| Cutout diameter | 14 1/8″ |
|---|---|
| Mounting depth | 7 1/2″ |
| Overall diameter | 15 5/8″ |
Cone area (Sd) calculated from Fs, Vas and Mms: 122.8 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 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.
- Timpano TPT-T1500-15 D4 2.83 ft³ sealed · 1.98 ft³ ported
- Quantum Audio QWX4000/15D4 2.83 ft³ sealed · 1.98 ft³ ported
- DD Audio 9515k ESP D1 2.83 ft³ sealed · 1.98 ft³ ported
- DD Audio 9515k ESP D2 2.83 ft³ sealed · 1.98 ft³ ported
- DD Audio 9515L ESP D1 2.83 ft³ sealed · 1.98 ft³ ported
- Machete M15 Super Sport D2 2.83 ft³ sealed · 1.98 ft³ ported
FAQ
What box does the Sundown Audio SA Rev.3-15 D4 need?
Recommended net volume: 2.79 ft³ sealed, 1.94 ft³ ported tuned to 34 Hz — for one sub in a sedan at 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 SA Rev.3-15 D4 Thiele/Small specs?
Fs 37 Hz, Qts 0.75, Vas 1.85 ft³, Xmax 0.75″, Sd 122.8 in².
What is the Sundown Audio SA Rev.3-15 D4 mounting depth?
Mounting depth is 7 1/2″, cutout diameter 14 1/8″. The inside depth of the box must exceed the mounting depth by at least 1″.
How much power does the Sundown Audio SA Rev.3-15 D4 handle and how do I wire it?
RMS power rating: 750 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.