Sundown Audio SDv3-12 D2
12″ subwoofer · dual 2 Ω · 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, 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 | 40 Hz |
| F3 (−3 dB, no cabin gain) | 38 Hz |
| Example box (outside) | 31 1/2″ × 15 3/4″ × 7 5/8″ |
Ported
deeper, louder| Tuning (Fb) | 30 Hz |
|---|---|
| Port | slot 1 9/16 × 14 5/16″, 35 5/8″ long |
| Port velocity at 500 W | 55 ft/s |
| F3 (−3 dB, no cabin gain) | 29 Hz |
| Example box (outside) | 31 1/2″ × 15 3/4″ × 11 1/4″ |
Deeper: 2.58 ft³ (73 L) tuned to 28 Hz, 31 1/2″ × 15 3/4″ × 14 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 | 12″ |
|---|---|
| Voice coils | dual 2 Ω |
| RMS power | 500 W |
| Fs | 25.5 Hz |
| Qts | 0.51 |
| Qes | 0.58 |
| Qms | 4.04 |
| Vas | 2.14 ft³ |
| Re (one coil) | 1.91 Ω |
|---|---|
| Sd | 66.8 in² |
| Xmax | 0.57″ |
| Vd | 38.1 in³ calc. |
| Mms | 170 g calc. |
| BL | 9.5 T·m calc. |
| EBP | 44 — suits sealed calc. |
| Sensitivity, 1 W / 1 m | 84.4 dB calc. |
Mounting dimensions
| Cutout diameter | 11 1/8″ |
|---|---|
| Mounting depth | 5″ |
| Overall diameter | 12 5/8″ |
Cone area (Sd) calculated from Fs, Vas and Mms: 66.8 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 12″ models
- Sundown Audio Ev2-12 D2 12″ · dual 2 Ω
- Sundown Audio Ev2-12 D4 12″ · dual 4 Ω
- Sundown Audio Ev4-12 D2 12″ · dual 2 Ω
- Sundown Audio Ev4-12 D4 12″ · dual 4 Ω
- Sundown Audio HZ-12 D4 12″ · dual 4 Ω
- Sundown Audio HZS-12 D4 12″ · dual 4 Ω
- Sundown Audio LCSv1-12 D4 12″ · dual 4 Ω
- Sundown Audio LCSv2-12 D4 12″ · dual 4 Ω
- Sundown Audio M12 D1 12″ · dual 1 Ω
- Sundown Audio M12 D2 12″ · dual 2 Ω
- Sundown Audio NSv1-12 D2 12″ · dual 2 Ω
- Sundown Audio NSv2-12 D2 12″ · dual 2 Ω
Similar 12″ subwoofers from other brands
Close in Fs, Qts and Vas — a box of similar volume will suit them.
- Kicx QS-300 (4+4) 1.34 ft³ sealed · 1.62 ft³ ported
- Rockford Fosgate Punch P3D2-12 1.24 ft³ sealed · 1.59 ft³ ported
- Infinity Kappa 1200W (SSI 2 ohm) 1.41 ft³ sealed · 1.84 ft³ ported
- Soundstream RW-12 1.09 ft³ sealed · 1.66 ft³ ported
- Rockford Fosgate Power T0D412 1.52 ft³ sealed · 1.59 ft³ ported
- Hertz Mille Pro MPS 300 S2 (shallow, SVC 2 ohm) 1.59 ft³ sealed · 1.84 ft³ ported
FAQ
What box does the Sundown Audio SDv3-12 D2 need?
Recommended net volume: 1.45 ft³ sealed, 1.70 ft³ ported tuned to 30 Hz — for one sub in a sedan at 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 SDv3-12 D2 Thiele/Small specs?
Fs 25.5 Hz, Qts 0.51, Vas 2.14 ft³, Xmax 0.57″, Sd 66.8 in².
What is the Sundown Audio SDv3-12 D2 mounting depth?
Mounting depth is 5″, cutout diameter 11 1/8″. The inside depth of the box must exceed the mounting depth by at least 1″.
How much power does the Sundown Audio SDv3-12 D2 handle and how do I wire it?
RMS power rating: 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.