VM Audio SRW12
12″ subwoofer · dual 4 Ω · 500 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, 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) | Boomy, with a bump · 1.55 |
|---|---|
| Fc | 53 Hz |
| F3 (−3 dB, no cabin gain) | 38 Hz |
| Example box (outside) | 31 1/2″ × 15 3/4″ × 8 1/2″ |
Ported
deeper, louder| Tuning (Fb) | 35 Hz |
|---|---|
| Port | slot 1 9/16 × 14 5/16″, 33 3/4″ long |
| Port velocity at 500 W | 35 ft/s |
| F3 (−3 dB, no cabin gain) | 38 Hz |
| Example box (outside) | 31 1/2″ × 15 3/4″ × 9 9/16″ |
Deeper: 2.83 ft³ (80 L) tuned to 41 Hz, 31 1/2″ × 15 3/4″ × 13 15/16″ 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 | 500 W |
| Fs | 38 Hz |
| Qts | 1.11 |
| Qes | 1.5 |
| Qms | 4.2 |
| Vas | 1.62 ft³ |
| Re (one coil) | 3.6 Ω |
|---|---|
| Sd | 73.4 in² |
| Xmax | ≈ 0.39″ |
| Mms | 121 g calc. |
| BL | 8.3 T·m calc. |
| EBP | 25 — suits sealed calc. |
| Sensitivity, 1 W / 1 m | 84.3 dB calc. |
Mounting dimensions
| Cutout diameter | 10 7/8″ |
|---|---|
| Mounting depth | 5 5/16″ |
Cone area (Sd) calculated from Fs, Vas and Mms: 73.4 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 EXW12 12″ · dual 4 Ω
Similar 12″ subwoofers from other brands
Close in Fs, Qts and Vas — a box of similar volume will suit them.
- BOSS Audio P120F 1.73 ft³ sealed · 1.24 ft³ ported
- Earthquake TNT-12DVC 1.73 ft³ sealed · 1.27 ft³ ported
- Deaf Bonce Hannibal HS-600 1.73 ft³ sealed · 1.24 ft³ ported
- Focal Flax Evo P 30 FSE (shallow, SVC 4 ohm) 1.80 ft³ sealed · 1.27 ft³ ported
- Rockford Fosgate Power T1S2-12 (Slim) 1.98 ft³ sealed · 1.38 ft³ ported
- Swat SW R12D4 1.73 ft³ sealed · 1.20 ft³ ported
FAQ
What box does the VM Audio SRW12 need?
Recommended net volume: 1.66 ft³ sealed, 1.31 ft³ ported tuned to 35 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 VM Audio SRW12 Thiele/Small specs?
Fs 38 Hz, Qts 1.11, Vas 1.62 ft³, Sd 73.4 in².
What is the VM Audio SRW12 mounting depth?
Mounting depth is 5 5/16″, cutout diameter 10 7/8″. The inside depth of the box must exceed the mounting depth by at least 1″.
How much power does the VM Audio SRW12 handle and how do I wire it?
RMS power rating: 500 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.