SPL Dynamics PRO-15D4 MK3
15″ subwoofer · dual 4 Ω · 700 W RMS
| Source | web.archive.org · manufacturer data |
|---|---|
| Checked against source | October 2026 |
| Thiele/Small parameters | not in the spec sheet: Sd — 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, 700 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 | 63 Hz |
| F3 (−3 dB, no cabin gain) | 60 Hz |
| Example box (outside) | 16 15/16″ × 16 15/16″ × 10 13/16″ |
Ported
deeper, louder| Tuning (Fb) | 34 Hz |
|---|---|
| Port | slot 1 15/16 × 16 5/16″, 27 1/8″ long |
| Port velocity at 700 W | 60 ft/s |
| F3 (−3 dB, no cabin gain) | 36 Hz |
| Example box (outside) | 31 1/2″ × 17 11/16″ × 12 9/16″ |
Deeper: 3.71 ft³ (105 L) tuned to 33 Hz, 31 1/2″ × 17 11/16″ × 17 3/8″ 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 | 15″ |
|---|---|
| Voice coils | dual 4 Ω |
| RMS power | 700 W |
| Fs | 33 Hz |
| Qts | 0.42 |
| Qes | 0.46 |
| Qms | 5.2 |
| Vas | 2.93 ft³ |
|---|---|
| Re (one coil) | 3.6 Ω |
| Sd | ≈ 124 in² |
| Xmax | 0.67″ |
| EBP | 72 — sealed or ported calc. |
| Sensitivity, 1 W / 1 m | 90.1 dB calc. |
Mounting dimensions
| Cutout diameter | 13 11/16″ |
|---|---|
| Mounting depth | 7 11/16″ |
“≈” 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 SPL Dynamics 15″ models
- SPL Dynamics PRO-15D2 MK3 15″ · dual 2 Ω
- SPL Dynamics PRO-15D2 MK4 15″ · dual 2 Ω
- SPL Dynamics PRO-15D4 MK4 15″ · dual 4 Ω
- SPL Dynamics PRO-380D2 15″ · dual 2 Ω
- SPL Dynamics PRO-380D4 15″ · dual 4 Ω
- SPL Dynamics SPL-380D1A 15″ · dual 1 Ω
- SPL Dynamics SPL-380D2 15″ · dual 2 Ω
- SPL Dynamics XTR-380D2S 15″ · dual 2 Ω
- SPL Dynamics XTR-380D4S 15″ · dual 4 Ω
Similar 15″ subwoofers from other brands
Close in Fs, Qts and Vas — a box of similar volume will suit them.
- DD Audio 615e D2 1.52 ft³ sealed · 2.33 ft³ ported
- DD Audio 615e D4 1.52 ft³ sealed · 2.33 ft³ ported
- NVX VCW154v3 1.38 ft³ sealed · 2.33 ft³ ported
- Ground Zero GZRW 38SPL (2x2 Ohm) 1.13 ft³ sealed · 3.67 ft³ ported
- Fi Audio Q15 D1 1.25 ft³ sealed · 2.15 ft³ ported
- Fi Audio Q15 NEO D1 1.62 ft³ sealed · 2.15 ft³ ported
FAQ
What box does the SPL Dynamics PRO-15D4 MK3 need?
Recommended net volume: 1.13 ft³ sealed, 2.33 ft³ ported tuned to 34 Hz — for one sub in a sedan at 700 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-15D4 MK3 Thiele/Small specs?
Fs 33 Hz, Qts 0.42, Vas 2.93 ft³, Xmax 0.67″.
What is the SPL Dynamics PRO-15D4 MK3 mounting depth?
Mounting depth is 7 11/16″, cutout diameter 13 11/16″. The inside depth of the box must exceed the mounting depth by at least 1″.
How much power does the SPL Dynamics PRO-15D4 MK3 handle and how do I wire it?
RMS power rating: 700 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.