Hertz CS 300 S4 12-Inch 700W Peak 4 Ohm Car Subwoofer
If you've been chasing that deep, tight, room-filling bass in your car without sacrificing half your boot space, the Hertz CS 300 S4 is built exactly for that. This 12-inch subwoofer from the Cento series packs serious low-frequency muscle into a compact, shallow-mount-friendly design — so you get the Hertz sound experience without the compromise.
What Is This Product?
The Hertz CS 300 S4 is a 12-inch (300 mm) car audio subwoofer from the Cento series, designed for sealed enclosures starting from just 32 litres. It handles 350W continuously and peaks at 700W, with a 4 Ohm single voice coil that works with virtually any car amplifier on the market. Every component — from the cone geometry to the magnetic assembly — has been engineered using FEM (Finite Element Method) simulations to deliver powerful, accurate bass with minimal distortion.
Why Choose This Product?
- ✅ Compact sealed design works in enclosures from just 32 litres — ideal for space-limited builds
- ✅ 700W peak power handling for genuinely impactful bass
- ✅ 4 Ohm single voice coil — compatible with virtually every aftermarket amplifier
- ✅ No rear decompression hole — lets you shape the box tightly around the sub for custom installs
- ✅ FEM-simulated cone and suspension for low distortion even at high excursion
- ✅ Six-layer voice coil keeps temperatures in check during long, loud listening sessions
- ✅ Accepts cables up to 8 AWG for low-resistance wiring in multi-sub setups
- ✅ Optional CG 300 grille available for a clean, finished look
Key Features
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Size: 300 mm (12 inches) — a classic subwoofer size that balances output and enclosure flexibility
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Power: 350W RMS / 700W Peak — enough headroom for demanding installs
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Impedance: 4 Ohm — single voice coil, universally compatible
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Voice Coil: 35 mm, six-layer copper — wound on a high thermal resistance glass-fibre former for sustained performance
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Cone: Polypropylene — lightweight, stiff, and moisture-resistant
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Magnet: High-density flux ferrite — 134 × 45 × 34 mm for a strong, controlled motor
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Xmech: 16.5 mm (0.65 in.) — generous mechanical excursion for deep bass reproduction
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Terminal Block: Push connectors up to 8 AWG — quick, secure wiring even in tight spaces
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ABS Plastic Gasket — included for grille mounting and a tidy finish
Advanced Technologies
FEM-Optimised Electroacoustic Design: Hertz engineers used Finite Element Method simulations to model the cone geometry, spider, and suspension together as a system. The result is a moving assembly that stays controlled and linear even when pushed hard — which means less distortion and more accurate bass at high volumes.
Fluid Dynamic Turbulence Reduction: At high excursions, air compression inside the enclosure can create unwanted noise and distortion. Hertz addressed this with a clever spider support design that acts as an air duct, channelling airflow towards venting holes in the basket. This dramatically reduces turbulence-induced distortion — something you'll notice most on fast, complex bass lines.
Six-Layer Voice Coil Cooling System: The 35 mm voice coil is wound in six layers of pure copper on a glass-fibre former. This construction increases thermal mass and improves heat dissipation, keeping the coil within a safe operating range even during extended high-volume sessions — protecting the driver and maintaining consistent performance.
Compact Magnetic Assembly: The reduced-depth magnetic group and the absence of a rear decompression hole give installers the freedom to build enclosures that wrap closely around the subwoofer. This opens up installation possibilities in vehicles where space is genuinely tight.
Benefits
- 🔊 Deep, powerful bass from a compact enclosure — no need for a massive box
- 🚗 Fits a wide range of vehicles thanks to its shallow-friendly design
- 🎵 Clean, low-distortion output even at high acoustic pressure levels
- 🔌 Easy wiring with push-connector terminal block — saves time on installation
- 🌡️ Runs cool under pressure — the six-layer coil handles heat efficiently
- 🛡️ Rubber-protected magnetic assembly and ABS gasket for long-term durability
- ✨ Optional grille for a premium, finished appearance
Who Should Buy This Product?
- Car audio enthusiasts who want genuine Hertz bass performance in a space-efficient package
- Installers building custom sealed enclosures in sedans, hatchbacks, or SUVs with limited boot space
- Anyone upgrading from a factory audio system who wants a significant, noticeable improvement in bass
- Multi-subwoofer build enthusiasts — the 4 Ohm SVC configuration and 8 AWG terminal make parallel/series wiring straightforward
- Younger enthusiasts entering the car audio hobby who want a reputable, well-engineered starting point
Technical Specifications
| Specification |
Value |
| Model |
CS 300 S4 |
| Size |
300 mm (12 in.) |
| Power Handling – Continuous (RMS) |
350 W |
| Power Handling – Peak |
700 W |
| Impedance |
4 Ohm |
| Voice Coil Diameter |
35 mm (1.38 in.) |
| Voice Coil Layers |
6 (pure copper) |
| Voice Coil Former |
High thermal resistance glass fibre |
| Magnet Type |
High density flux ferrite |
| Magnet Size (D × d × h) |
134 × 45 × 34 mm (5.28 × 1.77 × 1.34 in.) |
| Cone Material |
Polypropylene |
| Xmech |
16.5 mm (0.65 in.) |
| Filter Component |
Subwoofer (no crossover) |
| Minimum Enclosure Volume |
32 litres (sealed) |
| Terminal |
Push connectors, up to 8 AWG |
| Weight |
4.844 kg (10.68 lb.) |
| Gasket |
High-strength ABS plastic (included) |
| Optional Grille |
CG 300 (black metal mesh, sold separately) |
Why Choose Dolphin Accessories?
- ✅ 100% Genuine Products — every item we sell is sourced directly from authorised distributors
- ✅ Expert Guidance — our team understands car audio and can help you choose the right setup
- ✅ Pan-India Delivery — we ship to every corner of the country, quickly and reliably
- ✅ Secure Packaging — your subwoofer arrives protected and ready to install
- ✅ After-Sales Support — we're here after the purchase if you need help
- ✅ Trusted by Enthusiasts — thousands of happy customers across India trust Dolphin Accessories
Frequently Asked Questions
Q: What size enclosure does the Hertz CS 300 S4 need?
A: It's designed for sealed enclosures starting from 32 litres. That's quite compact for a 12-inch sub, which is one of its biggest advantages for tight installs.
Q: What amplifier power do I need for the CS 300 S4?
A: The sub handles 350W RMS continuously, so an amplifier delivering 250–350W RMS at 4 Ohm is the sweet spot. You can push it to 700W peak, but matching RMS ratings is what matters for daily use.
Q: Is the CS 300 S4 compatible with my stock head unit?
A: You'll need an external amplifier — a subwoofer of this calibre needs dedicated amplification to perform properly. It won't run directly from a head unit's internal amp.
Q: Can I use two CS 300 S4 subwoofers in one box?
A: Yes. The 4 Ohm single voice coil configuration is well-suited for multi-sub enclosures. The terminal block accepts cables up to 8 AWG, making wiring multiple drivers straightforward.
Q: Does the CS 300 S4 come with a grille?
A: The ABS plastic gasket for grille mounting is included. The CG 300 grille (black metal mesh with the Hertz diamond logo) is optional and sold separately.
Q: What is the Xmech rating and why does it matter?
A: Xmech is 16.5 mm — this is the maximum mechanical excursion before the driver reaches its physical limits. A higher Xmech generally means the sub can move more air and produce deeper bass without bottoming out.
Q: What does FEM simulation mean for this subwoofer?
A: FEM (Finite Element Method) is a computer modelling technique Hertz uses to simulate how the cone, spider, and suspension behave under real-world conditions. It helps them optimise the design for low distortion before a single prototype is built.
Q: Is the CS 300 S4 suitable for a ported enclosure?
A: Hertz has optimised this model specifically for sealed enclosures. While some users do experiment with ported boxes, the electroacoustic parameters are tuned for sealed use and that's where it performs best.
Q: What does the fluid dynamic turbulence reduction system do?
A: At high excursions, air trapped inside the enclosure can compress and create distortion. The spider support on the CS 300 S4 acts as an air duct, directing airflow through venting holes in the basket to reduce this effect — resulting in cleaner bass at high volumes.
Q: How heavy is the CS 300 S4?
A: It weighs 4.844 kg (10.68 lb.), which is typical for a 12-inch subwoofer with a ferrite magnet of this size.
Q: Is this subwoofer available with a different impedance?
A: The CS 300 S4 is the 4 Ohm single voice coil version. Hertz may offer other variants in the CS 300 range — check with us if you need a different impedance configuration.
Q: Does Dolphin Accessories provide warranty support for Hertz products?
A: Yes. All Hertz products sold through Dolphin Accessories are 100% genuine and come with manufacturer warranty support. Contact us after your purchase if you need any assistance.
