Diamond D612D2
12″ subwoofer · dual 2 Ω · 600 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 |
- Fs, Vas and Sd don't match the moving mass of 346 g (they give 651 g) — one of the spec sheet values is probably wrong.
Recommended box
For a sedan, one sub, 600 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) | Flat and accurate · 0.65 |
|---|---|
| Fc | 41 Hz |
| F3 (−3 dB, no cabin gain) | 47 Hz |
| Example box (outside) | 14 3/16″ × 14 3/16″ × 10 1/16″ |
Ported
deeper, louder| Tuning (Fb) | 34 Hz |
|---|---|
| Port | slot 1 9/16 × 14 5/16″, 39 9/16″ long |
| Port velocity at 600 W | 70 ft/s |
| F3 (−3 dB, no cabin gain) | 29 Hz |
| Example box (outside) | 21 3/4″ × 15 3/4″ × 13 3/8″ |
Deeper: 1.45 ft³ (41 L) tuned to 25 Hz, 30 3/4″ × 15 3/4″ × 8 11/16″ 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 | 600 W |
| Fs | 32.4 Hz |
| Qts | 0.51 |
| Qes | 0.56 |
| Qms | 5.24 |
| Vas | 0.44 ft³ |
| Re (one coil) | 1.95 Ω |
|---|---|
| Sd | 76 in² |
| Xmax | 0.70″ |
| Vd | 53.2 in³ calc. |
| Mms | 651 g calc. |
| BL | 21.5 T·m calc. |
| EBP | 58 — sealed or ported calc. |
| Sensitivity, 1 W / 1 m | 80.8 dB calc. |
Mounting dimensions
| Cutout diameter | 11 1/8″ |
|---|---|
| Mounting depth | 6 1/4″ |
| Overall diameter | 12 3/8″ |
“≈” 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/20060114070003/http://diamondaudio.com:80/products/pdfs/D6%2
- web.archive.org/web/20090612074532/http://www.diamondaudio.com:80/PDF/current/D6
Other Diamond 12″ models
- Diamond CM312D2 12″ · dual 2 Ω
- Diamond CM312D4 12″ · dual 4 Ω
- Diamond D122 12″ · dual 2 Ω
- Diamond D124 12″ · dual 4 Ω
- Diamond D312D2 12″ · dual 2 Ω
- Diamond D312D4 12″ · dual 4 Ω
- Diamond D612D4 12″ · dual 4 Ω
- Diamond D912D2 12″ · dual 2 Ω
- Diamond D912D4 12″ · dual 4 Ω
- Diamond DE122 12″ · dual 2 Ω
- Diamond DE124 12″ · dual 4 Ω
- Diamond DES122 12″ · dual 2 Ω
Similar 12″ subwoofers from other brands
Close in Fs, Qts and Vas — a box of similar volume will suit them.
- CT Sounds THERMO-12 D4 0.83 ft³ sealed · 1.17 ft³ ported
- Sundown Audio Zv7-12 D2 1.20 ft³ sealed · 2.12 ft³ ported
- Rockford Fosgate Power T2D212 0.78 ft³ sealed · 1.80 ft³ ported
- Sundown Audio M12 D2 1.02 ft³ sealed · 1.13 ft³ ported
- Sundown Audio Xv3-12 D2 0.90 ft³ sealed · 2.51 ft³ ported
- Sundown Audio Xv4-12 D2 1.09 ft³ sealed · 2.51 ft³ ported
FAQ
What box does the Diamond D612D2 need?
Recommended net volume: 0.71 ft³ sealed, 1.20 ft³ ported tuned to 34 Hz — for one sub in a sedan at 600 W. Fit the box to your space and amp in the free calculator, with plans and a cut sheet.
What are the Diamond D612D2 Thiele/Small specs?
Fs 32.4 Hz, Qts 0.51, Vas 0.44 ft³, Xmax 0.70″, Sd 76 in².
What is the Diamond D612D2 mounting depth?
Mounting depth is 6 1/4″, 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 Diamond D612D2 handle and how do I wire it?
RMS power rating: 600 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.