Hertz Energy ES 300D (DVC 4+4 ohm)
12″ subwoofer · dual 4 Ω · 350 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, 350 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 · 0.89 |
|---|---|
| Fc | 46 Hz |
| F3 (−3 dB, no cabin gain) | 40 Hz |
| Example box (outside) | 31 1/2″ × 15 3/4″ × 9 3/8″ |
Ported
deeper, louder| Tuning (Fb) | 32 Hz |
|---|---|
| Port | slot 1 9/16 × 14 5/16″, 21 3/4″ long |
| Port velocity at 350 W | 53 ft/s |
| F3 (−3 dB, no cabin gain) | 31 Hz |
| Example box (outside) | 31 1/2″ × 15 3/4″ × 12 9/16″ |
Deeper: 3.18 ft³ (90 L) tuned to 33 Hz, 31 1/2″ × 15 3/4″ × 15 3/4″ 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 | 12″ |
|---|---|
| Voice coils | dual 4 Ω |
| RMS power | 350 W |
| Fs | 29 Hz |
| Qts | 0.56 |
| Qes | 0.61 |
| Qms | 7 |
| Vas | 2.86 ft³ |
| Re (one coil) | 4 Ω |
|---|---|
| Sd | 82.3 in² |
| Xmax | 0.35″ |
| Vd | 29.2 in³ calc. |
| Mms | 149 g calc. |
| BL | 13.3 T·m calc. |
| EBP | 48 — suits sealed calc. |
| Sensitivity, 1 W / 1 m | 87.1 dB calc. |
Mounting dimensions
| Cutout diameter | 10 7/8″ |
|---|---|
| Mounting depth | 5 1/16″ |
| Overall diameter | 12 5/16″ |
“≈” 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 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 (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 Hi-Energy HX 300 D (DVC 4+4 ohm) 12″ · dual 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
Similar 12″ subwoofers from other brands
Close in Fs, Qts and Vas — a box of similar volume will suit them.
- Phoenix Gold Z12D4 (Z series, DVC 4 ohm) 1.80 ft³ sealed · 2.05 ft³ ported
- Rockford Fosgate Punch P212S8 (Stage-2, 2004) 1.80 ft³ sealed · 2.26 ft³ ported
- Machete MS-12 D4 1.73 ft³ sealed · 2.26 ft³ ported
- Rockford Fosgate Punch P2D4-12 2.01 ft³ sealed · 1.59 ft³ ported
- Kicker Solo-Baric L5 12" 2-Ohm DVC (S12L52) 2.30 ft³ sealed · 2.15 ft³ ported
- Phoenix Gold RX112D 1.77 ft³ sealed · 1.98 ft³ ported
FAQ
What box does the Hertz Energy ES 300D (DVC 4+4 ohm) need?
Recommended net volume: 1.87 ft³ sealed, 2.30 ft³ ported tuned to 32 Hz — for one sub in a sedan at 350 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 300D (DVC 4+4 ohm) Thiele/Small specs?
Fs 29 Hz, Qts 0.56, Vas 2.86 ft³, Xmax 0.35″, Sd 82.3 in².
What is the Hertz Energy ES 300D (DVC 4+4 ohm) mounting depth?
Mounting depth is 5 1/16″, cutout diameter 10 7/8″. The inside depth of the box must exceed the mounting depth by at least 1″.
How much power does the Hertz Energy ES 300D (DVC 4+4 ohm) handle and how do I wire it?
RMS power rating: 350 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.