Introduction
This manual provides essential information for the proper installation, operation, and maintenance of your HERTZ Mille Pro Shallow MPS 300 S2 subwoofer. Please read these instructions carefully before use to ensure optimal performance and longevity of your product.

Image: HERTZ Mille Pro Shallow MPS 300 S2 Subwoofer with protective grille installed.
Key Features:
- Ultra Shallow Overall Depth: Designed for installations where space is limited.
- 500W Continuous Power Handling: Ensures robust and reliable performance.
- Optimized for Extremely-Compact Sealed Enclosure: Ideal for enclosures between 20-24 liters (0.7-0.8 cubic feet).
- Air Intercooling Revolution (A.I.R): Prevents air-compression-related limitations, enhancing sound quality.
- Unrivaled Mechanical Excursion: Offers +20% more excursion compared to traditional designs for deeper bass.

Image: Cutaway view of the HERTZ Mille Pro Shallow Subwoofer, illustrating its internal design and Air Intercooling Revolution (A.I.R) technology.
Setup and Installation
Proper installation is crucial for the performance and safety of your subwoofer. If you are unsure about any steps, consult a professional installer.
1. Unpacking and Inspection:
Carefully remove the subwoofer from its packaging. Inspect for any signs of damage during transit. Ensure all components, including the grille, are present.

Image: HERTZ Mille Pro Shallow MPS 300 S2 Subwoofer without the protective grille, showing the cone.
2. Enclosure Requirements:
This subwoofer is optimized for extremely compact sealed enclosures, specifically 20-24 liters (0.7-0.8 cubic feet). Using an enclosure outside this recommended volume may compromise performance and reliability.

Image: Example of a subwoofer installed in a compact enclosure, illustrating suitable mounting for shallow subwoofers.
3. Mounting:
The MPS 300 S2 is designed for flush mount applications. Ensure the mounting surface is rigid and free from vibrations. Use appropriate mounting hardware to secure the subwoofer firmly.
- Cut a circular opening in the enclosure with the specified diameter (refer to specifications section).
- Ensure there is sufficient clearance behind the subwoofer for proper ventilation and excursion.
- Position the subwoofer and secure it using screws through the mounting holes. Do not overtighten.
4. Wiring Connections:
This is a 2Ω SVC (Single Voice Coil) subwoofer. Connect the subwoofer to a compatible amplifier. Ensure correct polarity (+ to + and - to -) to avoid phase issues and potential damage.
- Use high-quality speaker wire of appropriate gauge for the power level.
- Connect the positive (+) terminal of the subwoofer to the positive (+) output of the amplifier.
- Connect the negative (-) terminal of the subwoofer to the negative (-) output of the amplifier.
- Ensure all connections are secure and free from short circuits.

Image: Rear view of the HERTZ Mille Pro Shallow MPS 300 S2 Subwoofer, highlighting the connection terminals.
Operating Instructions
Follow these guidelines for optimal performance and to prolong the life of your subwoofer.
1. Break-in Period:
Allow a break-in period of approximately 10-20 hours of normal listening before operating the subwoofer at high volumes. This allows the suspension components to loosen and reach their optimal performance characteristics.
2. Amplifier Gain Setting:
Set the amplifier gain correctly to match the output of your head unit. An improperly set gain can lead to distortion and potential damage to the subwoofer. Start with the gain at its lowest setting and slowly increase it until you hear distortion, then back off slightly.
3. Crossover Settings:
Utilize your amplifier's or head unit's low-pass filter (LPF) to send only low frequencies to the subwoofer. A typical LPF setting for a 12-inch subwoofer is between 60Hz and 80Hz. Experiment to find the best integration with your main speakers.
4. Volume Control:
Avoid prolonged operation at extremely high volumes where audible distortion is present. Distortion indicates that the subwoofer or amplifier is being overdriven, which can cause permanent damage.
Maintenance
The HERTZ Mille Pro Shallow MPS 300 S2 subwoofer requires minimal maintenance to ensure long-term performance.
- Cleaning: Use a soft, dry cloth to wipe down the grille and surround. Avoid using harsh chemicals or abrasive cleaners.
- Inspection: Periodically check the speaker cone and surround for any signs of damage, tears, or deterioration. Ensure all mounting screws remain tight.
- Environmental Factors: Protect the subwoofer from extreme temperatures, direct sunlight, and moisture.
Troubleshooting Guide
If you experience issues with your subwoofer, refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| No Sound from Subwoofer |
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| Distorted or Unclear Bass |
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| Weak or Muffled Bass |
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If the problem persists after trying these solutions, contact HERTZ customer support or a qualified car audio technician.
Technical Specifications
Below are the detailed technical specifications for the HERTZ Mille Pro Shallow MPS 300 S2 Subwoofer:
| Feature | Specification |
|---|---|
| Brand | HERTZ |
| Model Number | MPS-300-S2 |
| Speaker Type | Subwoofer |
| Subwoofer Diameter | 12 inches (300mm) |
| Maximum Peak Power | 1000 watts |
| Continuous Power Handling | 500 watts |
| Impedance | 2 ohm (Single Voice Coil) |
| Mounting Type | Flush Mount |
| Enclosure Material (Structure) | Aluminum, Steel |
| Recommended Enclosure Volume | 20-24 Liters (0.7-0.8 Cubic Feet) Sealed |
| Item Weight | 10 pounds |
| Is Waterproof | No |
| Compatible Vehicle Types | SUVs, Select Cars, Trucks |
| Audio Driver Type | Dynamic Driver |
| What's in the Box | Subwoofer, Metal structure and grille |
Note: Specifications are subject to change without notice.
Warranty Information
The HERTZ Mille Pro Shallow MPS 300 S2 Subwoofer comes with a Limited Warranty.
Warranty Description: 1-Year Manufacturer Warranty.
For detailed terms and conditions of the warranty, including coverage and claim procedures, please refer to the official HERTZ website or contact HERTZ customer support. Keep your proof of purchase for warranty claims.
Customer Support
If you require further assistance, have questions not covered in this manual, or need technical support, please contact HERTZ customer service.
- Manufacturer: Hertz
- Official Website: www.hertz-audio.com
- Online Resources: Check the HERTZ website for FAQs, additional manuals, and contact information.
When contacting support, please have your product model number (MPS-300-S2) and proof of purchase readily available.





