Hertz CS 250 S4 10-Inch 600W Peak 4 Ohm Car Subwoofer 

If you've been chasing that deep, tight bass that you can feel as much as hear, the Hertz CS 250 S4 is built for exactly that. Part of the acclaimed Cento Series, this 10-inch subwoofer packs serious low-frequency performance into a compact, installation-friendly package — making it a smart upgrade for any car audio setup, whether you're building from scratch or stepping up from a factory system.

What is the Hertz CS 250 S4?

The Hertz CS 250 S4 (CS 250 S4250) is a 250 mm (10-inch) car subwoofer from Hertz's Cento Series, designed to deliver powerful, accurate bass from sealed enclosures as small as 16 litres. It handles 300W of continuous power and peaks at 600W, with a 4Ω single voice coil configuration that works with virtually any aftermarket amplifier. The compact magnetic group and shallow depth make it ideal for custom-fit installations where space is tight.

Why Choose the Hertz CS 250 S4?

• ✅ Engineered by Hertz's R&D team specifically for compact sealed enclosures — no need for a large box
• ✅ 600W peak power handling for impactful, room-filling bass in your car
• ✅ 4Ω single voice coil — maximum compatibility with any amplifier or multi-sub setup
• ✅ FEM-simulated cone and spider geometry for low distortion even at high excursion
• ✅ Six-layer copper voice coil keeps temperatures in check during long, loud listening sessions
• ✅ No rear decompression hole — lets you shape the enclosure tightly around the sub for a cleaner install
• ✅ Push-connector terminal block accepts cables up to 8 AWG for easy, low-resistance wiring
• ✅ Optional CG 250 grille available for a finished, protected look

Key Features

• Size: 250 mm (10 inches) — A versatile mid-size subwoofer that fits most car boot and under-seat enclosures
• Power Handling: 300W RMS / 600W Peak — Handles sustained power cleanly without thermal stress
• Impedance: 4Ω Single Voice Coil — Plug-and-play compatibility with standard mono amplifiers
• Voice Coil: 35 mm (1.38 in.) diameter, six-layer copper winding — More copper means better heat dissipation and longer life
• Cone Material: Polypropylene — Lightweight yet rigid, ideal for accurate bass reproduction
• Magnet: High-density flux ferrite, 120 × 45 × 34 mm — Strong, consistent magnetic field for controlled excursion
• Xmech: 16.5 mm (0.65 in.) — Generous mechanical excursion for deep, extended bass
• Minimum Enclosure: 16 litres — Optimised for compact sealed boxes
• Terminal Block: Solid push connectors, up to 8 AWG — Secure, low-resistance connections even in multi-sub installs
• Gasket: High-strength ABS plastic — Allows optional grille fitment for a clean finish

Advanced Technologies

FEM-Optimised Cone and Spider Design
Hertz used Finite Element Method (FEM) computer simulations to design the cone geometry, suspension, and spider of the CS 250 S4. This engineering process identifies and eliminates stress points before a single prototype is built, resulting in a moving assembly that stays controlled and linear even when pushed to its mechanical limits. The practical result for you: cleaner bass with less distortion at high volume.

Fluid Dynamic Turbulence Reduction System
At high excursion levels, air compression inside the basket can create unwanted noise and distortion. Hertz addressed this with an innovative system where the spider support doubles as an air duct, channelling airflow towards venting holes in the basket. This dramatically reduces turbulence-induced distortion, keeping the bass tight and accurate even during demanding listening sessions.

Six-Layer Copper Voice Coil on Glass-Fibre Former
The 35 mm voice coil is wound in six layers of pure copper on a high thermal-resistance glass-fibre support. More copper layers mean more motor force and better heat dissipation — so the CS 250 S4 can handle extended high-volume use without the voice coil overheating and compressing the sound.

Compact Magnetic Group with No Decompression Hole
The absence of a rear decompression hole is a deliberate design choice. It means the enclosure can be built to closely follow the subwoofer's profile, achieving an overall installation depth close to that of a standard speaker. This opens up installation possibilities in vehicles where a traditional deep sub box simply won't fit.

Benefits

• 🔊 Deep, punchy bass that you feel in your chest — not just hear
• 🚗 Fits neatly into compact custom enclosures, keeping your boot space usable
• 🌡️ Runs cool even during long, high-volume drives thanks to the six-layer voice coil
• 🎯 Low distortion at all volume levels — bass stays clean, not muddy
• 🔌 Simple wiring with push-connector terminals that accept thick 8 AWG cables
• 🛡️ Rubber-protected magnetic assembly and ABS gasket for long-term durability
• ✨ Optional grille gives a premium, finished look to your installation

Who Should Buy the Hertz CS 250 S4?

• Car audio enthusiasts upgrading from a factory or entry-level subwoofer
• Installers building custom enclosures in hatchbacks, sedans, or SUVs with limited boot space
• Anyone running a mono amplifier who wants a straightforward 4Ω single-coil sub
• Music lovers who want accurate, low-distortion bass rather than just loud bass
• Younger enthusiasts entering the Hertz ecosystem with the Cento Series

Technical Specifications

Why Choose Dolphin Accessories?

• ✅ 100% Genuine Products — Every Hertz product we sell is sourced through authorised channels. No grey imports, no counterfeits.
• ✅ Expert Guidance — Our team understands car audio. We'll help you match the right subwoofer, amplifier, and enclosure for your specific vehicle and listening preferences.
• ✅ Pan-India Delivery — We ship to every corner of India with reliable courier partners and careful packaging.
• ✅ Secure Packaging — Subwoofers are heavy and fragile. We pack every unit to survive the journey and arrive 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 its reputation with India's car audio community through honest advice and quality products.

Frequently Asked Questions

Q: What size enclosure does the Hertz CS 250 S4 need?
A: Hertz has optimised the CS 250 S4 for sealed enclosures starting from 16 litres. Its compact magnetic group and lack of a rear decompression hole mean you can build a tight custom box that closely follows the subwoofer's profile.

Q: What amplifier power does the CS 250 S4 need?
A: The CS 250 S4 handles 300W RMS continuously and peaks at 600W. For best results, pair it with a mono amplifier rated between 200W and 400W RMS at 4Ω. Underpowering is just as harmful as overpowering, so try to stay within that range.

Q: Is the Hertz CS 250 S4 compatible with any amplifier?
A: Yes. The 4Ω single voice coil configuration is the most universally compatible impedance, working with virtually every mono or bridged stereo amplifier on the market. It also works well in multi-subwoofer setups.

Q: What does the S4 mean in the model name?
A: The S4 refers to the 4Ω (4 Ohm) single voice coil configuration. Hertz uses this naming convention across the Cento Series to indicate impedance at a glance.

Q: Can I use the Hertz CS 250 S4 in a ported (vented) enclosure?
A: Hertz has specifically engineered and optimised the CS 250 S4 for sealed enclosures. While it may work in a ported box, the electroacoustic parameters are tuned for sealed use, so a sealed enclosure will give you the best performance.

Q: Does the CS 250 S4 come with a grille?
A: The subwoofer comes with an ABS plastic gasket that allows you to fit the optional CG 250 grille (sold separately). The CG 250 is a robust black metal mesh grille with Hertz's signature diamond aluminium logo.

Q: How does the six-layer voice coil help?
A: More layers of copper winding mean more motor force and significantly better heat dissipation. This allows the CS 250 S4 to handle extended high-volume listening without the voice coil overheating, which would otherwise cause power compression and reduced output.

Q: What is FEM simulation and why does it matter for a subwoofer?
A: FEM stands for Finite Element Method — a computer simulation technique that analyses stress, movement, and resonance across every part of the cone, spider, and suspension before manufacturing. For you, it means the CS 250 S4's moving parts are precisely engineered to stay linear and distortion-free even at high excursion levels.

Q: What is the fluid dynamic turbulence reduction system?
A: At high excursion, air trapped inside the basket can compress and create audible distortion. Hertz designed the spider support to act as an air duct, directing airflow towards venting holes in the basket. This reduces turbulence and keeps the bass clean at high volume.

Q: Is the Hertz CS 250 S4 suitable for all car types?
A: Yes. Its compact depth and the absence of a rear decompression hole make it suitable for hatchbacks, sedans, SUVs, and even vehicles with limited boot space. The enclosure can be shaped closely around the subwoofer for a near-flush installation.

Q: Is this product genuine and covered by warranty?
A: Absolutely. Dolphin Accessories sells only 100% genuine Hertz products sourced through authorised channels. Warranty terms are as per Hertz India's official policy — contact us after purchase for warranty registration assistance.

Q: How do I order the Hertz CS 250 S4 from Dolphin Accessories?
A: Simply add it to your cart and check out. We offer pan-India delivery with secure packaging. If you have questions about compatibility with your car or amplifier before ordering, reach out to our team — we're happy to help you get the right setup.