Hertz SPL Show SX 300D (DVC 2+2 ohm)
12″ subwoofer · dual 2 Ω · 800 W RMS
Fs 46 HzQts 0.48Vas 0.71 ft³Xmax 0.55″
Recommended box
For a sedan, one sub, 800 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 | 0.68 |
| Fc | 65 Hz |
| F3 (−3 dB, no cabin gain) | 71 Hz |
| Example box (outside) | 14 3/16″ × 14 3/16″ × 10 1/16″ |
Ported
| Net volume | 1.45 ft³ (41 L) |
|---|---|
| Tuning (Fb) | 39 Hz |
| Port | slot 2 3/8 × 14 5/16″, 36 5/16″ long |
| Port velocity at 800 W | 62 ft/s |
| F3 (−3 dB, no cabin gain) | 36 Hz |
| Example box (outside) | 31 1/2″ × 15 3/4″ × 11 3/16″ |
Thiele/Small parameters
| Fs | 46 Hz |
|---|---|
| Qts | 0.48 |
| Qes | 0.51 |
| Qms | 8.2 |
| Vas | 0.71 ft³ |
| Re (one coil) | 2 Ω |
| Sd | 75.7 in² |
| Xmax | 0.55″ |
| Vd | 41.7 in³ calc. |
| Mms | 202 g calc. |
| BL | 15.1 T·m calc. |
| EBP | 90 — sealed or ported calc. |
| Sensitivity, 1 W / 1 m | 87.8 dB calc. |
General
| Size | 12″ |
|---|---|
| Voice coils | dual 2 Ω |
| RMS power | 800 W |
Mounting dimensions
| Cutout diameter | 11 3/16″ |
|---|---|
| Mounting depth | 6 11/16″ |
| Overall diameter | 12 1/2″ |
Cone area (Sd) calculated from Fs, Vas and Mms: 75.7 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
- static.hertz-audio.com/media/2021/04/hertz_SX_2010_AdvancedManual.pdf
- static.hertz-audio.com/media/2021/04/HERTZ_SPL_Tech_Sheet_SX300D.pdf
Other Hertz 12″ models
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