Sundown Audio Xv1-12 D2
12″ subwoofer · dual 2 Ω · 1,250 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, 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) | Dry and tight · 0.62 |
|---|---|
| Fc | 38 Hz |
| F3 (−3 dB, no cabin gain) | 46 Hz |
| Example box (outside) | 14 3/16″ × 14 3/16″ × 12 1/8″ |
Ported
deeper, louder| Tuning (Fb) | 30 Hz |
|---|---|
| Port | slot 1 15/16 × 14 5/16″, 67 1/2″ long |
| Port velocity at 1,250 W | 67 ft/s |
| F3 (−3 dB, no cabin gain) | 27 Hz |
| Example box (outside) | 31 1/2″ × 15 3/4″ × 11 7/8″ |
The volume and tuning are the recommendation, but the port doesn’t fit this example box. Size the box and port in the designer.
Open ported box in designerDeeper: 1.38 ft³ (39 L) tuned to 26 Hz, 18 11/16″ × 15 3/4″ × 12 3/16″ 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 | 12″ |
|---|---|
| Voice coils | dual 2 Ω |
| RMS power | 1,250 W |
| Fs | 25.3 Hz |
| Qts | 0.41 |
| Qes | 0.45 |
| Qms | 5.02 |
| Vas | 1.11 ft³ |
| Re (one coil) | 1.9 Ω |
|---|---|
| Sd | 72.6 in² |
| Xmax | 1.18″ |
| Vd | 85.7 in³ calc. |
| Mms | 390 g calc. |
| BL | 16.2 T·m calc. |
| EBP | 56 — sealed or ported calc. |
| Sensitivity, 1 W / 1 m | 82.5 dB calc. |
Mounting dimensions
| Cutout diameter | 11 1/8″ |
|---|---|
| Mounting depth | 9 11/16″ |
| Overall diameter | 12 11/16″ |
Cone area (Sd) calculated from Fs, Vas and Mms: 72.6 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 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.
- Sky High Car Audio BMX-12 D2 0.74 ft³ sealed · 1.13 ft³ ported
- RE Audio XX12 D4 v2 1.06 ft³ sealed · 2.22 ft³ ported
- Audiobahn AWP312X 0.71 ft³ sealed · 2.26 ft³ ported
- Ground Zero GZRW 30-D2 (2x2 Ohm) 0.71 ft³ sealed · 1.20 ft³ ported
- Pride M.16 12 D2 0.85 ft³ sealed · 1.31 ft³ ported
- URAL Decibel 12 (1+1) 0.64 ft³ sealed · 1.09 ft³ ported
FAQ
What box does the Sundown Audio Xv1-12 D2 need?
Recommended net volume: 0.90 ft³ sealed, 1.17 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 Xv1-12 D2 Thiele/Small specs?
Fs 25.3 Hz, Qts 0.41, Vas 1.11 ft³, Xmax 1.18″, Sd 72.6 in².
What is the Sundown Audio Xv1-12 D2 mounting depth?
Mounting depth is 9 11/16″, 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 Xv1-12 D2 handle and how do I wire it?
RMS power rating: 1,250 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.