Hertz Hi-Energy HX 300 D (DVC 4+4 ohm)
12″ subwoofer · dual 4 Ω · 600 W RMS
Fs 31 HzQts 0.40Vas 1.54 ft³Xmax 0.55″
Recommended box
For a sedan, one sub, 600 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 | 0.71 ft³ (20 L) |
|---|---|
| Qtc | 0.72 |
| Fc | 55 Hz |
| F3 (−3 dB, no cabin gain) | 57 Hz |
| Example box (outside) | 14 3/16″ × 14 3/16″ × 10 1/16″ |
Ported
| Net volume | 1.73 ft³ (49 L) |
|---|---|
| Tuning (Fb) | 32 Hz |
| Port | slot 1 3/4 × 14 5/16″, 34 1/8″ long |
| Port velocity at 600 W | 65 ft/s |
| F3 (−3 dB, no cabin gain) | 31 Hz |
| Example box (outside) | 31 1/2″ × 15 3/4″ × 11 1/2″ |
Thiele/Small parameters
| Fs | 31 Hz |
|---|---|
| Qts | 0.40 |
| Qes | 0.43 |
| Qms | 6.9 |
| Vas | 1.54 ft³ |
| Re (one coil) | 2.9 Ω |
| Sd | 77 in² |
| Xmax | 0.55″ |
| Vd | 42.4 in³ calc. |
| Mms | 212 g calc. |
| BL | 16.7 T·m calc. |
| EBP | 72 — sealed or ported calc. |
| Sensitivity, 1 W / 1 m | 86.8 dB calc. |
General
| Size | 12″ |
|---|---|
| Voice coils | dual 4 Ω |
| RMS power | 600 W |
Mounting dimensions
| Cutout diameter | 11 3/16″ |
|---|---|
| Mounting depth | 6 3/8″ |
| Overall diameter | 12 1/2″ |
Cone area (Sd) calculated from Fs, Vas and Mms: 77 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 12″ models
- Hertz Cento CS 300 S2 (SVC 2 ohm) 12″ · 2 Ω
- Hertz Cento CS 300 S4 (SVC 4 ohm) 12″ · 4 Ω
- Hertz Dieci DS 30.3 (SVC 4 ohm) 12″ · 4 Ω
- Hertz Dieci DS 300.3 (SVC 4 ohm) 12″ · 4 Ω
- Hertz Energy ES 300.5 (SVC 4 ohm) 12″ · 4 Ω
- Hertz Energy ES 300D.5 (DVC 4+4 ohm) 12″ · dual 4 Ω
- Hertz Energy ES F30.5 (free-air/shallow, SVC 4 ohm) 12″ · 4 Ω
- Hertz Hi-Energy HX 300 (SVC 4 ohm) 12″ · 4 Ω
- Hertz Mille Pro MP 300 D2.3 (DVC 2+2 ohm) 12″ · dual 2 Ω
- Hertz Mille Pro MP 300 D4.3 (DVC 4+4 ohm) 12″ · dual 4 Ω
- Hertz Mille Pro MPS 300 S2 (shallow, SVC 2 ohm) 12″ · 2 Ω
- Hertz Mille Pro MPS 300 S4 (shallow, SVC 4 ohm) 12″ · 4 Ω