Hertz MPBX 300 S2 12" Peak 1000W Ultra-Shallow Sealed Subwoofer System
Most car boots can fit a subwoofer box. Not every car boot can fit a deep one. If you've ever measured your available depth and come up short, the Hertz MPBX 300 S2 was designed specifically for that situation. At just 118mm (4.65 inches) deep, this complete 12-inch subwoofer system fits where conventional boxes simply won't — and it still reaches down to 25 Hz. It's a ready-to-install solution: the MPS 300 S2 driver is already mounted in a purpose-built sealed enclosure, with a smart terminal system, a reversible firing orientation, and a mesh grille included. Plug in, choose your orientation, and you're done.
What is the Hertz MPBX 300 S2?
The MPBX 300 S2 is a complete car subwoofer box system from Hertz's Mille Pro series. It combines the MPS 300 S2 12-inch driver with an ultra-shallow sealed enclosure that is just 118mm deep — specifically engineered to deliver the full performance of the MPS 300 S2 driver in a form factor that fits under seats, in shallow boots, or in any space where a conventional subwoofer box would be too tall. The system operates at 2 Ohm, handles 1000W peak power, and covers a frequency response of 25 to 400 Hz. Everything you need for installation is included: the driver, the enclosure, mounting feet, a mesh grille, and the SSP Smart Plug terminal system.
Why Choose the Hertz MPBX 300 S2?
- ✅ Complete system — driver and enclosure included, ready to install out of the box
- ✅ Ultra-shallow 118mm (4.65") depth — fits where conventional subwoofer boxes cannot
- ✅ 2S² dual-orientation design — choose Down-Firing for deeper bass or Up-Firing for more punch
- ✅ 25 Hz frequency response — genuine sub-bass extension from a shallow enclosure
- ✅ SSP Smart Plug terminal — plug-and-play or traditional push connectors, your choice
- ✅ A.I.R. (Air Intercooling Revolution) technology — prevents air-compression-related performance limitations
- ✅ 15mm wood thickness — robust enclosure construction that minimises resonances
- ✅ Mesh grille with adjustable logo position included — suitable for reverse installation
Key Features
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300mm (12") Driver (MPS 300 S2) — A purpose-built ultra-shallow 12-inch subwoofer driver with a die-cast aluminium frame and polypropylene cone.
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1000W Peak / 500W Continuous Power — Handles serious amplifier power in a compact, sealed enclosure.
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2 Ohm Impedance — Compatible with most mono amplifiers operating at 2 Ohm for maximum power output.
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118mm (4.65") Enclosure Depth — Ultra-shallow profile designed to fit in spaces where conventional subwoofer boxes are too deep.
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Frequency Response: 25–400 Hz — Reaches genuine sub-bass frequencies despite the shallow enclosure design.
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38mm (1.5") Six-Layer Copper Voice Coil — Six layers of copper winding for high thermal capacity and reliable power handling.
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2S² (2 Sides/2 Sounds) Design — Switch between Down-Firing (deeper bass extension, using supplied feet with hook-and-loop inserts) and Up-Firing (more punch and definition) without any modification.
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SSP (Sub Smart Plug) Terminal — Features both a plug-and-play terminal block and traditional push terminals for bulletproof connection and quick release.
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15mm Wood Enclosure Walls — Thick, robust construction with panel-to-panel internal bracing and solid corners to minimise resonances.
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Internal Sound-Absorbing Material — Virtually increases the effective box volume and reduces acoustic resonances for cleaner bass.
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Round Corners — Eases placement in tight spaces and reduces the risk of damage during installation.
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Screw-Less Mesh Grille — Robust grille with adjustable logo position, suitable for reverse installation.
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EID (Scan, Discover, Identify) — Hertz's product identification system for quick access to product information and documentation.
Advanced Technologies
A.I.R. — Air Intercooling Revolution: One of the biggest challenges for shallow subwoofer drivers is air compression. When a driver moves in a very shallow enclosure, the air behind the cone has less room to move, which creates back-pressure that limits excursion and compresses the sound. Hertz's A.I.R. technology addresses this directly by managing airflow within the driver assembly to prevent air-compression-related limitations. The result is that the MPS 300 S2 achieves unrivalled mechanical excursion — claimed to be 20% greater than traditional shallow designs — without the performance ceiling that normally comes with ultra-shallow installations.
2S² (2 Sides/2 Sounds) Dual-Orientation Design: Most subwoofer boxes are fixed in one firing direction. The MPBX 300 S2 gives you a genuine choice. Down-Firing installation — using the supplied feet with hook-and-loop inserts — directs the sound toward the floor, which tends to increase low-frequency extension and gives the bass a deeper, more room-filling character. Up-Firing installation directs the sound upward, which typically produces more punch and definition. The ability to switch between these two orientations without any modification means you can tune the character of your bass to suit your music preferences or vehicle acoustics.
SSP (Sub Smart Plug) Terminal System: The SSP terminal is a dual-mode connection system that solves a common installation frustration. The plug-and-play terminal block allows for quick, secure connections that can be released just as easily — useful during installation or if you ever need to remove the system. The traditional push terminals are there for installers who prefer a conventional wiring approach. Both options are available on the same unit, so you choose the method that works best for your setup.
Purpose-Built Ultra-Shallow Enclosure: The enclosure is not a generic box — it was specifically engineered around the acoustic parameters of the MPS 300 S2 driver. The 15mm wood walls, panel-to-panel internal bracing, solid corners, and internal sound-absorbing material all work together to maximise the effective acoustic volume of the enclosure and minimise resonances. The round corners ease placement in tight spaces, and the overall depth of just 118mm makes it one of the shallowest 12-inch sealed subwoofer systems available.
Benefits
- 🎵 Deep bass down to 25 Hz from an enclosure just 118mm deep — no compromise on extension
- ⚡ 1000W peak power handling — built for high-output mono amplifier systems
- 📦 Complete ready-to-install system — no separate enclosure build required
- 🔄 Two firing orientations in one box — tune your bass character without buying a different system
- 🔌 SSP Smart Plug terminal — quick, secure, and flexible wiring options
- 🌡️ A.I.R. technology prevents air compression — consistent performance at all output levels
- 🛡️ 15mm wood walls with internal bracing — robust enclosure that won't rattle or resonate
- 🔩 Mesh grille with adjustable logo — clean, finished appearance straight out of the box
Who Should Buy the Hertz MPBX 300 S2?
- Car owners with limited boot depth who want a 12-inch subwoofer system without building a custom enclosure
- Enthusiasts who want a clean, finished installation without the time and cost of a custom box build
- Anyone upgrading from a factory sound system who wants a plug-and-play bass solution with genuine performance
- Installers looking for a high-quality, complete subwoofer system for vehicles with shallow boot floors
- Music lovers who want the flexibility to tune their bass character between deeper extension and punchier definition
Technical Specifications
| Specification |
Value |
| Model |
Hertz MPBX 300 S2 |
| Series |
Mille Pro |
| Included Driver |
MPS 300 S2 |
| Driver Size |
300 mm (12 inch) |
| Power Handling – Continuous |
500 W |
| Power Handling – Peak |
1000 W |
| Impedance |
2 Ohm (Single Voice Coil) |
| Voice Coil Diameter |
38 mm (1.5 inch) |
| Voice Coil Layers |
6 (copper) |
| Frequency Response |
25 – 400 Hz |
| Mechanical Excursion (Xmech) |
20 mm |
| Magnet Type |
High-density flux ferrite |
| Magnet Size (D x d x h) |
134 x 55 x 36 mm (6.28 x 2.17 x 1.42 in) |
| Cone Material |
Polypropylene |
| Driver Frame |
Die-cast aluminium |
| Enclosure Type |
Sealed (ultra-shallow) |
| Enclosure Depth |
118 mm (4.65 in) |
| Enclosure Wall Thickness |
15 mm (0.59 in) |
| Firing Orientation |
Down-Firing / Up-Firing (2S² design) |
| Terminal System |
SSP (Sub Smart Plug) — plug-and-play + push terminals |
| Grille |
Screw-less mesh grille, adjustable logo, reverse-install compatible |
| Total System Weight |
10.8 kg (23.8 lb) |
Why Choose Dolphin Accessories?
- ✅ 100% Genuine Products — Every product we sell is sourced directly from authorised distributors. No counterfeits, no compromises.
- ✅ Expert Guidance — Our team understands car audio. We help you choose the right subwoofer system, amplifier, and wiring for your specific vehicle and listening preferences.
- ✅ Pan-India Delivery — We ship to every corner of India, with careful packaging to ensure your equipment arrives in perfect condition.
- ✅ Secure Packaging — Premium car audio equipment deserves premium protection. Every order is packed to withstand the journey.
- ✅ After-Sales Support — Have a question after your purchase? Our team is here to help with installation advice, amplifier matching, and more.
- ✅ Trusted by Enthusiasts — Dolphin Accessories is the go-to destination for serious car audio enthusiasts across India.
Frequently Asked Questions
Q: Does the Hertz MPBX 300 S2 come with the subwoofer driver included?
A: Yes. The MPBX 300 S2 is a complete system — the MPS 300 S2 12-inch driver is already mounted in the enclosure. You receive the box with the driver installed, mounting feet, a mesh grille, and the SSP Smart Plug terminal system. You only need to connect an amplifier and power it up.
Q: How shallow is the Hertz MPBX 300 S2 enclosure?
A: The enclosure is just 118mm (4.65 inches) deep. This makes it one of the shallowest 12-inch sealed subwoofer systems available, suitable for vehicles where a conventional subwoofer box would be too tall to fit comfortably.
Q: What is the 2S² design and how does it work?
A: 2S² stands for 2 Sides/2 Sounds. The enclosure is designed to be used in two orientations. Down-Firing — using the supplied feet with hook-and-loop inserts — directs the sound toward the floor for deeper bass extension. Up-Firing directs the sound upward for more punch and definition. You can switch between the two orientations without any modification to the box.
Q: What amplifier do I need for the Hertz MPBX 300 S2?
A: The MPBX 300 S2 operates at 2 Ohm and handles 500W continuous / 1000W peak. For best results, pair it with a mono amplifier rated between 300W and 600W RMS at 2 Ohm.
Q: What is the SSP (Sub Smart Plug) terminal system?
A: The SSP terminal is a dual-mode connection system. It includes both a plug-and-play terminal block for quick, secure connections and traditional push terminals for conventional wiring. Both options are available on the same unit, so you can choose whichever method suits your installation.
Q: What is A.I.R. technology on the MPS 300 S2 driver?
A: A.I.R. stands for Air Intercooling Revolution. It is a system within the driver that manages airflow to prevent air-compression-related limitations — a common problem with shallow subwoofer drivers where the limited space behind the cone creates back-pressure that restricts excursion. A.I.R. technology allows the MPS 300 S2 to achieve 20% greater mechanical excursion than traditional shallow designs.
Q: What is the frequency response of the Hertz MPBX 300 S2?
A: The frequency response is 25 Hz to 400 Hz. The 25 Hz lower limit is particularly impressive for a shallow sealed enclosure and means the system can reproduce genuine sub-bass frequencies.
Q: Can I use the Hertz MPBX 300 S2 under a car seat?
A: The 118mm depth makes it a strong candidate for under-seat installation in many vehicles, particularly SUVs and larger sedans. We recommend measuring the available height under your seat before purchasing to confirm fitment.
Q: Does the Hertz MPBX 300 S2 come with a grille?
A: Yes. A robust screw-less mesh grille is included, with an adjustable logo position that is suitable for reverse installation.
Q: What does EID mean on the Hertz MPBX 300 S2?
A: EID stands for Scan, Discover, Identify. It is Hertz's product identification system that allows you to scan the product to quickly access product information, documentation, and support resources.
Q: Does Dolphin Accessories provide installation support for the Hertz MPBX 300 S2?
A: Yes. Our team can guide you on amplifier matching, wiring, and installation orientation. Reach out to us before or after your purchase for personalised advice.
Q: Is the Hertz MPBX 300 S2 covered by a warranty?
A: Yes, it comes with the standard Hertz manufacturer warranty. Please contact Dolphin Accessories after your purchase for warranty registration and support details.
