Diamond MD12.4 (MacDaddy)
12″ subwoofer · 4 Ω · 600 W RMS
| Source | web.archive.org · manufacturer data |
|---|---|
| Checked against source | October 2026 |
| Thiele/Small parameters | complete |
| Mounting dimensions | 0 of 4 — missing: cutout, mounting depth, frame outer diameter, magnet diameter; the designer will use an estimate |
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 | 50 Hz |
| F3 (−3 dB, no cabin gain) | 58 Hz |
| Example box (outside) | 14 3/16″ × 14 3/16″ × 10 7/16″ |
Ported
deeper, louder| Tuning (Fb) | 30 Hz |
|---|---|
| Port | slot 2 3/8 × 14 5/16″, 37 1/16″ long |
| Port velocity at 600 W | 60 ft/s |
| F3 (−3 dB, no cabin gain) | 28 Hz |
| Example box (outside) | 31 1/2″ × 15 3/4″ × 15 1/8″ |
Deeper: 1.55 ft³ (44 L) tuned to 30 Hz, 31 1/2″ × 15 3/4″ × 11 9/16″ 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 | 4 Ω |
| RMS power | 600 W |
| Fs | 26 Hz |
| Qts | 0.34 |
| Qes | 0.36 |
| Qms | 6 |
| Vas | 1.97 ft³ |
| Re | 2.97 Ω |
|---|---|
| Sd | 80.6 in² |
| Xmax | 0.58″ |
| Vd | 47 in³ calc. |
| Mms | 258 g calc. |
| BL | 18.6 T·m calc. |
| EBP | 72 — sealed or ported calc. |
| Sensitivity, 1 W / 1 m | 86.3 dB calc. |
Mounting dimensions
| Cutout diameter | ≈ 11 1/8″ |
|---|---|
| Mounting depth | ≈ 5 7/8″ |
Only Qts is published — Qms assumed to be 6 and Qes calculated (barely affects box design).
“≈” 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 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 D612D2 12″ · dual 2 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
Similar 12″ subwoofers from other brands
Close in Fs, Qts and Vas — a box of similar volume will suit them.
- Soundstream XPRO-12 0.71 ft³ sealed · 2.26 ft³ ported
- Dayton Audio RSS315HO-4 0.74 ft³ sealed · 1.52 ft³ ported
- Dayton Audio SS12-22 0.76 ft³ sealed · 2.44 ft³ ported
- Soundstream X-Pro 12 (2009) 0.71 ft³ sealed · 2.33 ft³ ported
- Pride Junior Pro 12 D2 0.67 ft³ sealed · 2.19 ft³ ported
- Resilient Sounds RS 12 D4 0.71 ft³ sealed · 2.33 ft³ ported
FAQ
What box does the Diamond MD12.4 (MacDaddy) need?
Recommended net volume: 0.74 ft³ sealed, 2.40 ft³ ported tuned to 30 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 MD12.4 (MacDaddy) Thiele/Small specs?
Fs 26 Hz, Qts 0.34, Vas 1.97 ft³, Xmax 0.58″, Sd 80.6 in².
How much power does the Diamond MD12.4 (MacDaddy) handle and how do I wire it?
RMS power rating: 600 W. Wiring for several subs and amp power — in the wiring calculator.