Elemental Designs e15SP4
15″ subwoofer · 1,000 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 | 1 of 4 — missing: mounting depth, frame outer diameter, magnet diameter; the designer will use an estimate |
Recommended box
For a sedan, one sub, 1,000 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 | 44 Hz |
| F3 (−3 dB, no cabin gain) | 43 Hz |
| Example box (outside) | 17 5/16″ × 17 5/16″ × 13 1/4″ |
Ported
deeper, louder| Tuning (Fb) | 30 Hz |
|---|---|
| Port | slot 2 3/4 × 16 11/16″, 31 5/8″ long |
| Port velocity at 1,000 W | 64 ft/s |
| F3 (−3 dB, no cabin gain) | 28 Hz |
| Example box (outside) | 31 1/2″ × 18 1/8″ × 18 1/8″ |
Deeper: 4.80 ft³ (136 L) tuned to 25 Hz, 31 1/2″ × 18 1/8″ × 23″ 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 | — |
| RMS power | 1,000 W |
| Fs | 20.7 Hz |
| Qts | 0.37 |
| Qes | 0.402 |
| Qms | 5.03 |
| Vas | 5.60 ft³ |
|---|---|
| Re | 3.8 Ω |
| Sd | ≈ 124 in² |
| Xmax | 1.14″ |
| EBP | 51 — sealed or ported calc. |
| Sensitivity, 1 W / 1 m | 87.4 dB calc. |
Mounting dimensions
| Cutout diameter | 14″ |
|---|---|
| Mounting depth | ≈ 7 1/16″ |
“≈” 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
- web.archive.org/web/20021022100725/http://www.edesignaudio.com/ep/spts.htm
- web.archive.org/web/20041116132944/http://www.edesignaudio.com/archive/15SP.htm
Other Elemental Designs 15″ models
- Elemental Designs 15A.22 15″ · dual 2 Ω
- Elemental Designs 16Ov.2 15″ · dual 2 Ω
- Elemental Designs E15a 15″ · DVC
- Elemental Designs e15K (2003) 15″ · DVC
- Elemental Designs e15kd4 15″ · DVC
- Elemental Designs E15o 15″ · DVC
Similar 15″ subwoofers from other brands
Close in Fs, Qts and Vas — a box of similar volume will suit them.
- Dayton Audio RSS390HO-4 1.17 ft³ sealed · 2.30 ft³ ported
- Dayton Audio MX15-22 1.91 ft³ sealed · 3.78 ft³ ported
- Lanzar HRWDC15 2.12 ft³ sealed · 3.67 ft³ ported
- MTX Audio T8154 1.45 ft³ sealed · 4.10 ft³ ported
- Ground Zero GZHW 38X (2x2 Ohm) 2.12 ft³ sealed · 3.67 ft³ ported
- Ground Zero GZRW 15D2 (2x2 Ohm) 2.51 ft³ sealed · 3.67 ft³ ported
FAQ
What box does the Elemental Designs e15SP4 need?
Recommended net volume: 1.55 ft³ sealed, 3.67 ft³ ported tuned to 30 Hz — for one sub in a sedan at 1,000 W. Fit the box to your space and amp in the free calculator, with plans and a cut sheet.
What are the Elemental Designs e15SP4 Thiele/Small specs?
Fs 20.7 Hz, Qts 0.37, Vas 5.60 ft³, Xmax 1.14″.
How much power does the Elemental Designs e15SP4 handle and how do I wire it?
RMS power rating: 1,000 W. Wiring for several subs and amp power — in the wiring calculator.