Hertz S 300 S4 12-Inch Car Audio Subwoofer
If you've been chasing that deep, room-filling bass in your car without sacrificing clarity, the Hertz S 300 S4 is built exactly for that. Part of the Hertz Uno range, this 12-inch subwoofer punches well above its class — delivering tight, low-frequency output that you feel as much as you hear, whether you're cruising on the highway or sitting in traffic.
What is the Hertz S 300 S4?
The Hertz S 300 S4 is a 12-inch (300mm) single voice coil car audio subwoofer from the Uno product line by Hertz, an Italian car audio brand known for precision engineering. It is designed to produce powerful, deep bass with high efficiency, making it suitable for a wide range of car audio builds — from daily drivers to dedicated sound systems. It works well in both sealed and reflex (ported) enclosures, giving installers flexibility in how they set it up.
Why Choose the Hertz S 300 S4?
- ✅ Exceptional 89.5 dB efficiency — gets loud without demanding excessive power
- ✅ Patented V-cone® technology for stiff, accurate cone movement at high excursion
- ✅ 33 Hz resonance frequency — genuinely deep bass, not just loud bass
- ✅ Compatible with both sealed and reflex enclosures for flexible installation
- ✅ Lightweight paper cone and foam surround keep the moving mass low for faster response
- ✅ ABS pre-assembled gasket for a clean, professional finish once installed
- ✅ Pure copper voice coil on an aluminium former for excellent heat dissipation
Key Features
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Size: 300mm (12 inches) — A popular size that balances deep bass extension with enclosure flexibility.
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Power Handling: 250W RMS / 1000W Peak — Handles sustained power cleanly; the peak rating gives headroom for dynamic music transients.
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Impedance: 4 Ohm — Standard impedance that pairs easily with most aftermarket amplifiers.
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Sensitivity: 89.5 dB — High efficiency means more output per watt, reducing the amplifier power you need.
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Resonance Frequency (Fs): 33 Hz — Impressively low for a subwoofer at this efficiency level, enabling genuine sub-bass reproduction.
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Voice Coil: 38mm (1.5 in.) pure copper on aluminium former — Copper improves conductivity; the aluminium former dissipates heat quickly during long listening sessions.
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Xmech: ±15.1mm — The mechanical excursion limit, indicating how far the cone can travel safely for maximum output.
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Magnet: High Density Flux Ferrite (134 x 45 x 34mm) — A large, powerful magnet structure for a strong and controlled motor.
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Cone Material: Painted Pressed Paper Pulp — Lightweight yet rigid, ideal for accurate bass reproduction.
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Surround: High Density Foam — Provides long-throw capability while maintaining linearity.
Advanced Technologies
V-cone® System: The V-cone® is a patented Hertz technology that reinforces the cone structure to maintain stiffness even during wide excursions. When a subwoofer cone moves a large distance — which is necessary for deep bass — it can flex and distort, introducing unwanted noise. The V-cone® design prevents this by distributing stress across the cone geometry, so the bass you hear stays clean and accurate even at high volume levels.
FEM-Refined Motor Structure: The motor (the magnet and voice coil assembly) has been optimised using Finite Element Method (FEM) analysis. This is a computer-aided engineering process that maps the magnetic field inside the motor to ensure it is as uniform and efficient as possible. The result is a more linear, controlled cone movement — which translates directly to lower distortion and better sound quality.
High-Density Flux Ferrite Magnet: The ferrite magnet used in the S 300 S4 is manufactured to a high-density specification, meaning it produces a stronger magnetic field for its size compared to standard ferrite. Combined with the low-carbon steel pole pieces, this creates a powerful and efficient motor that drives the cone with authority.
Benefits
- 🔊 Deep, impactful bass that you feel in your chest — not just hear
- 🎵 Clean, undistorted low frequencies even at high volume
- ⚡ High efficiency means less strain on your amplifier and electrical system
- 🔧 Flexible enclosure compatibility — works in sealed or ported boxes
- 🏎️ Designed specifically for car audio environments and acoustic challenges
- ✨ Professional-looking installation with the included ABS gasket
- 🌡️ Excellent thermal management for long listening sessions without overheating
Who Should Buy the Hertz S 300 S4?
- Car audio enthusiasts upgrading from a factory or entry-level subwoofer
- Installers looking for a reliable, high-efficiency 12-inch driver for custom builds
- Music lovers who want accurate, deep bass — not just loud bass
- Anyone building a sealed or ported sub enclosure and needs a driver that performs in both
- Buyers who want a genuine Italian-engineered subwoofer at a competitive price point
Technical Specifications
| Specification |
Value |
| Size |
300 mm (12 in.) |
| Power Handling — Continuous (RMS) |
250 W |
| Power Handling — Peak |
1000 W |
| Impedance |
4 Ohm |
| Sensitivity |
89.5 dB |
| Resonance Frequency (Fs) |
33 Hz |
| Voice Coil Diameter |
38 mm (1.5 in.) |
| Voice Coil Material |
Pure Copper on Aluminium Former |
| Magnet Type |
High Density Flux Ferrite |
| Magnet Size (D x d x h) |
134 x 45 x 34 mm (5.28 x 1.77 x 1.34 in.) |
| Cone Material |
Painted Pressed Paper Pulp |
| Surround Material |
High Density Foam |
| Xmech (Mechanical Excursion) |
±15.1 mm (0.59 in.) |
| Weight |
3 kg (6.61 lb.) |
| Product Range |
Hertz Uno |
| Enclosure Type |
Sealed or Reflex (Ported) |
| SKU |
Hertz S 300 S4 |
Why Choose Dolphin Accessories?
- ✅ 100% Genuine Products — Every product we sell is sourced directly from authorised distributors. No counterfeits, no grey market imports.
- ✅ Expert Guidance — Our team understands car audio. We can help you match the right subwoofer, amplifier, and enclosure for your specific vehicle and listening preferences.
- ✅ Pan-India Delivery — We ship to all major cities and towns across India, with reliable courier partners and real-time tracking.
- ✅ Secure Packaging — Car audio components are fragile. We pack every order carefully to ensure it arrives in perfect condition.
- ✅ After-Sales Support — Have a question after your purchase? Our support team is here to help with installation advice and warranty queries.
- ✅ Trusted by Enthusiasts — Dolphin Accessories has built a reputation among serious car audio enthusiasts across India for quality, reliability, and honest advice.
Frequently Asked Questions
Q: What amplifier power does the Hertz S 300 S4 need?
A: The S 300 S4 handles 250W RMS continuously, so an amplifier delivering between 150W and 300W RMS at 4 Ohm is ideal. Avoid underpowering it significantly, as that can cause distortion and damage over time.
Q: Is the Hertz S 300 S4 suitable for a sealed enclosure?
A: Yes. The S 300 S4 is optimised for both sealed and reflex (ported) enclosures. A sealed box will give you tighter, more accurate bass, while a ported box will give you louder, deeper output.
Q: What is the V-cone® technology in the Hertz S 300 S4?
A: V-cone® is a patented Hertz design that reinforces the cone structure to keep it stiff during large excursions. This prevents cone flex and distortion at high volume, resulting in cleaner bass.
Q: What is the impedance of the Hertz S 300 S4?
A: It is a 4 Ohm single voice coil subwoofer, which is the most common impedance and compatible with the vast majority of aftermarket car amplifiers.
Q: How deep does the Hertz S 300 S4 go?
A: The resonance frequency (Fs) is 33 Hz, which is quite low for a subwoofer at this efficiency level. In a well-tuned enclosure, you can expect usable bass output down to around 30–35 Hz.
Q: Is the Hertz S 300 S4 a good subwoofer for daily use?
A: Absolutely. Its high efficiency (89.5 dB) means it produces strong output without needing a very powerful amplifier, making it practical and easy to run daily without stressing your car's electrical system.
Q: What size enclosure does the Hertz S 300 S4 need?
A: Hertz recommends specific enclosure volumes for sealed and ported boxes. Refer to the official Hertz datasheet or contact us at Dolphin Accessories for enclosure recommendations tailored to your car.
Q: Does the Hertz S 300 S4 come with a gasket?
A: Yes. It includes a pre-assembled ABS gasket that gives the installation a clean, professional appearance once the subwoofer is mounted in the enclosure.
Q: What is the difference between RMS power and peak power?
A: RMS (250W) is the continuous power the subwoofer can handle safely over time. Peak (1000W) is the maximum it can handle for very short bursts. Always match your amplifier's RMS output to the subwoofer's RMS rating.
Q: Is the Hertz S 300 S4 available with pan-India delivery?
A: Yes. Dolphin Accessories ships the Hertz S 300 S4 across India. Orders are securely packed and dispatched with tracking so you can follow your shipment.
Q: What is the weight of the Hertz S 300 S4?
A: The subwoofer weighs 3 kg (6.61 lb.), which is typical for a 12-inch driver with a ferrite magnet structure.
Q: Is the Hertz S 300 S4 a genuine product at Dolphin Accessories?
A: Yes. All products at Dolphin Accessories are sourced from authorised distributors. The Hertz S 300 S4 you receive is 100% genuine with full manufacturer warranty support.
