Hertz Mille Pro MPS 300 S2 (shallow, SVC 2 ohm)
12″ subwoofer · 2 Ω · 500 W RMS
Fs 24 HzQts 0.51Vas 2.29 ft³Xmax 0.66″
Recommended box
For a sedan, one sub, 500 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 | 1.59 ft³ (45 L) |
|---|---|
| Qtc | 0.80 |
| Fc | 38 Hz |
| F3 (−3 dB, no cabin gain) | 35 Hz |
| Example box (outside) | 31 1/2″ × 15 3/4″ × 8 3/16″ |
Ported
| Net volume | 3.32 ft³ (94 L) |
|---|---|
| Tuning (Fb) | 25 Hz |
| Port | slot 2 3/16 × 14 5/16″, 35 3/8″ long |
| Port velocity at 500 W | 60 ft/s |
| F3 (−3 dB, no cabin gain) | 22 Hz |
| Example box (outside) | 31 1/2″ × 15 3/4″ × 18 3/8″ |
Thiele/Small parameters
| Fs | 24 Hz |
|---|---|
| Qts | 0.51 |
| Qes | 0.55 |
| Qms | 7.5 |
| Vas | 2.29 ft³ |
| Re | 1.9 Ω |
| Sd | 85.9 in² |
| Xmax | 0.66″ |
| Vd | 56.8 in³ calc. |
| Mms | 295 g calc. |
| BL | 12.4 T·m calc. |
| EBP | 44 — suits sealed calc. |
| Sensitivity, 1 W / 1 m | 84.1 dB calc. |
General
| Size | 12″ |
|---|---|
| Voice coils | 2 Ω |
| RMS power | 500 W |
Mounting dimensions
| Cutout diameter | 11 1/8″ |
|---|---|
| Mounting depth | 3 1/2″ |
| Overall diameter | 12 1/2″ |
| Magnet diameter | 6 1/8″ |
Cone area (Sd) calculated from Fs, Vas and Mms: 85.9 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
- hertz-audio.com/product/mps-300-s2/
- static.hertz-audio.com/media/2024/04/HERTZ_Mille-PRO_TechSheet-MPS300_S2_revC.pd
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 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
- Hertz Mille Pro MPS 300 S4 (shallow, SVC 4 ohm) 12″ · 4 Ω