SPL Dynamics PRO-12D2 MK4
12″ subwoofer · dual 2 Ω · 500 W RMS
| Source | web.archive.org · manufacturer data |
|---|---|
| Checked against source | October 2026 |
| Thiele/Small parameters | complete |
| 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) | Tight and punchy · 0.80 |
|---|---|
| Fc | 62 Hz |
| F3 (−3 dB, no cabin gain) | 58 Hz |
| Example box (outside) | 14 3/16″ × 14 3/16″ × 12 5/16″ |
Ported
deeper, louder| Tuning (Fb) | 34 Hz |
|---|---|
| Port | slot 1 9/16 × 14 5/16″, 34 15/16″ long |
| Port velocity at 500 W | 54 ft/s |
| F3 (−3 dB, no cabin gain) | 38 Hz |
| Example box (outside) | 21 5/8″ × 15 3/4″ × 13 3/4″ |
Deeper: 2.90 ft³ (82 L) tuned to 33 Hz, 31 1/2″ × 15 3/4″ × 15 3/4″ 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 | 500 W |
| Fs | 39 Hz |
| Qts | 0.51 |
| Qes | 0.54 |
| Qms | 8.02 |
| Vas | 1.37 ft³ |
| Re (one coil) | 1.6 Ω |
|---|---|
| Sd | 85 in² |
| Xmax | 0.67″ |
| Vd | 56.9 in³ calc. |
| Mms | 183 g calc. |
| BL | 11.5 T·m calc. |
| EBP | 72 — sealed or ported calc. |
| Sensitivity, 1 W / 1 m | 88.3 dB calc. |
Mounting dimensions
| Cutout diameter | 11″ |
|---|---|
| Mounting depth | 6 1/2″ |
Cone area (Sd) calculated from Fs, Vas and Mms: 85 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/20070718034538/http://www.spldynamics.fi:80/oldmodels/oldsub
- web.archive.org/web/20060113051451/http://www.spldynamics.fi:80/pro-sub/pro-12d2
Other SPL Dynamics 12″ models
- SPL Dynamics PRO-12D2 MK3 12″ · dual 2 Ω
- SPL Dynamics PRO-12D4 MK3 12″ · dual 4 Ω
- SPL Dynamics PRO-12D4 MK4 12″ · dual 4 Ω
- SPL Dynamics PRO-300D2 12″ · dual 2 Ω
- SPL Dynamics PRO-300D4 12″ · dual 4 Ω
- SPL Dynamics SPL-300D1A 12″ · dual 1 Ω
- SPL Dynamics SPL-300D2 12″ · dual 2 Ω
- SPL Dynamics SW-300D2 12″ · dual 2 Ω
- SPL Dynamics SW-300D4 12″ · dual 4 Ω
- SPL Dynamics V-12S 12″ · 4 Ω
- SPL Dynamics V-12S4 12″ · 4 Ω
- SPL Dynamics V-300D2 12″ · dual 2 Ω
Similar 12″ subwoofers from other brands
Close in Fs, Qts and Vas — a box of similar volume will suit them.
- Machete M12 D2 Lite 0.85 ft³ sealed · 1.20 ft³ ported
- Machete MF-12S D4 0.81 ft³ sealed · 1.20 ft³ ported
- Bomber Bicho Papão 800W 4+4 Ohm (SW12BPF800-4+4) 0.74 ft³ sealed · 1.13 ft³ ported
- Deaf Bonce Apocalypse DB-4512R D1 1.80 ft³ sealed · 1.20 ft³ ported
- Machete ML-12R D4 0.81 ft³ sealed · 1.20 ft³ ported
- CT Sounds HYDRO-12 D4 0.71 ft³ sealed · 1.27 ft³ ported
FAQ
What box does the SPL Dynamics PRO-12D2 MK4 need?
Recommended net volume: 0.92 ft³ sealed, 1.34 ft³ ported tuned to 34 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 SPL Dynamics PRO-12D2 MK4 Thiele/Small specs?
Fs 39 Hz, Qts 0.51, Vas 1.37 ft³, Xmax 0.67″, Sd 85 in².
What is the SPL Dynamics PRO-12D2 MK4 mounting depth?
Mounting depth is 6 1/2″, cutout diameter 11″. The inside depth of the box must exceed the mounting depth by at least 1″.
How much power does the SPL Dynamics PRO-12D2 MK4 handle and how do I wire it?
RMS power rating: 500 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.