VM Audio EXW12
12″ subwoofer · dual 4 Ω · 1,200 W RMS
| Source | web.archive.org · manufacturer data |
|---|---|
| Checked against source | October 2026 |
| Thiele/Small parameters | not in the spec sheet: Xmax — typical value for the size used |
| Mounting dimensions | 2 of 4 — missing: frame outer diameter, magnet diameter; the designer will use an estimate |
Recommended box
For a sedan, one sub, 1,200 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 · 1.00 |
|---|---|
| Fc | 52 Hz |
| F3 (−3 dB, no cabin gain) | 42 Hz |
| Example box (outside) | 31 1/2″ × 15 3/4″ × 8 3/16″ |
Ported
deeper, louder| Tuning (Fb) | 35 Hz |
|---|---|
| Port | slot 1 9/16 × 14 5/16″, 41 1/16″ long |
| Port velocity at 1,200 W | 65 ft/s |
| F3 (−3 dB, no cabin gain) | 36 Hz |
| Example box (outside) | 31 1/2″ × 15 3/4″ × 9 3/16″ |
Deeper: 2.68 ft³ (76 L) tuned to 35 Hz, 31 1/2″ × 15 3/4″ × 16 7/16″ 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 4 Ω |
| RMS power | 1,200 W |
| Fs | 40 Hz |
| Qts | 0.78 |
| Qes | 0.97 |
| Qms | 3.9 |
| Vas | 1.05 ft³ |
| Re (one coil) | 3.55 Ω |
|---|---|
| Sd | 69.1 in² |
| Xmax | ≈ 0.39″ |
| Mms | 150 g calc. |
| BL | 11.7 T·m calc. |
| EBP | 41 — suits sealed calc. |
| Sensitivity, 1 W / 1 m | 84.9 dB calc. |
Mounting dimensions
| Cutout diameter | 10 15/16″ |
|---|---|
| Mounting depth | 5 13/16″ |
Cone area (Sd) calculated from Fs, Vas and Mms: 69.1 in².
Judging by its value, the published Re is for both coils in series — converted to per coil.
“≈” 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 VM Audio 12″ models
- VM Audio ECW120 12″ · dual 4 Ω
- VM Audio SRW12 12″ · dual 4 Ω
Similar 12″ subwoofers from other brands
Close in Fs, Qts and Vas — a box of similar volume will suit them.
- Spyder Nitro 12 350W S2 1.73 ft³ sealed · 1.20 ft³ ported
- Spyder Nitro 12 350W S4 1.73 ft³ sealed · 1.20 ft³ ported
- Quantum Audio QW3000/12D4 1.87 ft³ sealed · 1.31 ft³ ported
- American Bass XD-1244 1.84 ft³ sealed · 1.27 ft³ ported
- Pioneer TS-W310D4 1.73 ft³ sealed · 1.20 ft³ ported
- Diamond CM312D4 1.73 ft³ sealed · 1.20 ft³ ported
FAQ
What box does the VM Audio EXW12 need?
Recommended net volume: 1.59 ft³ sealed, 1.09 ft³ ported tuned to 35 Hz — for one sub in a sedan at 1,200 W. Fit the box to your space and amp in the free calculator, with plans and a cut sheet.
What are the VM Audio EXW12 Thiele/Small specs?
Fs 40 Hz, Qts 0.78, Vas 1.05 ft³, Sd 69.1 in².
What is the VM Audio EXW12 mounting depth?
Mounting depth is 5 13/16″, cutout diameter 10 15/16″. The inside depth of the box must exceed the mounting depth by at least 1″.
How much power does the VM Audio EXW12 handle and how do I wire it?
RMS power rating: 1,200 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.