Hertz Hi-Energy HX 380 (SVC 4 ohm)
15″ subwoofer · 4 Ω · 700 W RMS
Fs 30 HzQts 0.55Vas 4.35 ft³Xmax 0.55″
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
| Net volume | 2.79 ft³ (79 L) |
|---|---|
| Qtc | 0.88 |
| Fc | 48 Hz |
| F3 (−3 dB, no cabin gain) | 43 Hz |
| Example box (outside) | 31 1/2″ × 17 11/16″ × 11 7/8″ |
Ported
| Net volume | 4.77 ft³ (135 L) |
|---|---|
| Tuning (Fb) | 34 Hz |
| Port | slot 2 3/4 × 16 5/16″, 16 1/4″ long |
| Port velocity at 700 W | 63 ft/s |
| F3 (−3 dB, no cabin gain) | 31 Hz |
| Example box (outside) | 31 1/2″ × 17 11/16″ × 20 5/8″ |
Thiele/Small parameters
| Fs | 30 Hz |
|---|---|
| Qts | 0.55 |
| Qes | 0.62 |
| Qms | 4.8 |
| Vas | 4.35 ft³ |
| Re | 2.9 Ω |
| Sd | 123 in² |
| Xmax | 0.55″ |
| Vd | 67.8 in³ calc. |
| Mms | 204 g calc. |
| BL | 13.4 T·m calc. |
| EBP | 48 — suits sealed calc. |
| Sensitivity, 1 W / 1 m | 89.3 dB calc. |
General
| Size | 15″ |
|---|---|
| Voice coils | 4 Ω |
| RMS power | 700 W |
Mounting dimensions
| Cutout diameter | 13 13/16″ |
|---|---|
| Mounting depth | 6 7/8″ |
| Overall diameter | 15 3/8″ |
Cone area (Sd) calculated from Fs, Vas and Mms: 123 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
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 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