Hertz Energy ES 380 (SVC 4 ohm)
15″ subwoofer · 4 Ω · 450 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 |
Recommended box
For a sedan, one sub, 450 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) | Boomy, with a bump · 0.99 |
|---|---|
| Fc | 45 Hz |
| F3 (−3 dB, no cabin gain) | 38 Hz |
| Example box (outside) | 31 1/2″ × 17 11/16″ × 12 3/4″ |
Ported
deeper, louder| Tuning (Fb) | 30 Hz |
|---|---|
| Port | slot 1 9/16 × 16 5/16″, 15 1/4″ long |
| Port velocity at 450 W | 63 ft/s |
| F3 (−3 dB, no cabin gain) | 31 Hz |
| Example box (outside) | 31 1/2″ × 17 11/16″ × 16 15/16″ |
Deeper: 5.12 ft³ (145 L) tuned to 33 Hz, 31 1/2″ × 17 11/16″ × 21 3/16″ 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 | 15″ |
|---|---|
| Voice coils | 4 Ω |
| RMS power | 450 W |
| Fs | 24 Hz |
| Qts | 0.52 |
| Qes | 0.55 |
| Qms | 11 |
| Vas | 7.77 ft³ |
| Re | 3.1 Ω |
|---|---|
| Sd | 132.5 in² |
| Xmax | 0.35″ |
| Vd | 47 in³ calc. |
| Mms | 207 g calc. |
| BL | 13.3 T·m calc. |
| EBP | 44 — suits sealed calc. |
| Sensitivity, 1 W / 1 m | 89.4 dB calc. |
Mounting dimensions
| Cutout diameter | 13 3/4″ |
|---|---|
| Mounting depth | 5 15/16″ |
| Overall diameter | 15 9/16″ |
“≈” 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 Hertz 15″ models
- Hertz Dieci DS 38.3 (SVC 4 ohm) 15″ · 4 Ω
- Hertz Energy ES 380.5 (SVC 4 ohm) 15″ · 4 Ω
- Hertz Hi-Energy HX 380 (SVC 4 ohm) 15″ · 4 Ω
- Hertz Hi-Energy HX 380 D (DVC 4+4 ohm) 15″ · dual 4 Ω
- Hertz SPL Show SS 15 D2 (DVC 2+2 ohm) 15″ · dual 2 Ω
- Hertz SPL Show SX 380D (DVC 2+2 ohm) 15″ · dual 2 Ω
Similar 15″ subwoofers from other brands
Close in Fs, Qts and Vas — a box of similar volume will suit them.
- Audio System R 15 FA 2.83 ft³ sealed · 3.71 ft³ ported
- Audio System M 15 2.83 ft³ sealed · 3.71 ft³ ported
- Polk Audio MM2154 DVC 2.86 ft³ sealed · 3.74 ft³ ported
- Rockford Fosgate Punch HX2 RFD1215 (2000) 2.83 ft³ sealed · 3.67 ft³ ported
- Spyder Nitro 15 700W D2 2.83 ft³ sealed · 3.67 ft³ ported
- Spyder Nitro 15 700W D4 2.83 ft³ sealed · 3.67 ft³ ported
FAQ
What box does the Hertz Energy ES 380 (SVC 4 ohm) need?
Recommended net volume: 3.04 ft³ sealed, 3.92 ft³ ported tuned to 30 Hz — for one sub in a sedan at 450 W. Fit the box to your space and amp in the free calculator, with plans and a cut sheet.
What are the Hertz Energy ES 380 (SVC 4 ohm) Thiele/Small specs?
Fs 24 Hz, Qts 0.52, Vas 7.77 ft³, Xmax 0.35″, Sd 132.5 in².
What is the Hertz Energy ES 380 (SVC 4 ohm) mounting depth?
Mounting depth is 5 15/16″, cutout diameter 13 3/4″. The inside depth of the box must exceed the mounting depth by at least 1″.
How much power does the Hertz Energy ES 380 (SVC 4 ohm) handle and how do I wire it?
RMS power rating: 450 W. Wiring for several subs and amp power — in the wiring calculator.