Hertz DS 30.3 Dieci 12" Peak 1000W Car Subwoofer
There's a point in every car audio upgrade where you realise the speakers alone aren't enough — you need bass that you can actually feel. The Hertz DS 30.3 is built for exactly that moment. A 12-inch subwoofer from the Dieci series, it reaches down to 28Hz, handles 1000W peak, and does it all with a polypropylene cone, butyl rubber surround, and a cooling system designed to keep it running reliably at high output. Whether you're building your first sub setup or upgrading an existing one, the DS 30.3 delivers the kind of bass that makes the rest of your system make sense.
What is the Hertz DS 30.3?
The Hertz DS 30.3 is a 12-inch (300mm) single voice coil car subwoofer from Hertz's Dieci series. It uses a polypropylene cone with mica injection, a butyl rubber surround, and a 38mm voice coil wound on a 115mm high-density ferrite magnet. With 1000W peak power handling, 250W RMS, and a 4 Ohm impedance, it's designed to work with a wide range of mono amplifiers. The 9mm mechanical excursion (Xmech) allows for high output with minimal distortion, and the built-in cooling system ensures reliable performance even during extended high-volume listening. It's designed for use in compact sealed or reflex (ported) enclosures, giving you flexibility in how and where you install it.
Why Choose the Hertz DS 30.3?
- ✅ 12-inch driver — the most popular subwoofer size for a reason: the best balance of bass extension and enclosure size
- ✅ 1000W peak / 250W RMS — handles serious amplifier power without breaking up
- ✅ 28Hz frequency response — reaches into sub-bass territory for genuine low-end impact
- ✅ Polypropylene cone with mica injection — stiff, lightweight, and resistant to moisture
- ✅ Butyl rubber surround — more durable and consistent than foam surrounds over time
- ✅ 9mm Xmech — high mechanical excursion for high output with minimal distortion
- ✅ Efficient cooling system — keeps the voice coil cool during extended high-power use
- ✅ Works in sealed or reflex enclosures — flexible installation options for any boot size
- ✅ 4 Ohm single voice coil — straightforward wiring to any mono amplifier
Key Features
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Size: 12 inch (300mm) — the most popular subwoofer size for car audio installations
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Peak Power: 1000W — handles high-power mono amplifiers without distortion
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Continuous (RMS) Power: 250W — the real-world sustained power rating for matching with amplifiers
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Impedance: 4 Ohm (Single Voice Coil) — straightforward wiring to any 4 Ohm mono amplifier
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Frequency Response: 28Hz – 300Hz — reaches deep into sub-bass for genuine low-end impact
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Voice Coil Diameter: 38mm (1.5 in.) — handles heat well during extended high-power sessions
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Mechanical Excursion (Xmech): 9mm — high excursion for high output with minimal distortion
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Magnet: 115 x 50 x 25mm high-density ferrite — large magnet for strong motor force and bass control
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Cone: Polypropylene with mica injection — stiff, lightweight, moisture-resistant
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Surround: Butyl rubber — durable, consistent, and resistant to heat and humidity
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Enclosure Type: Sealed or reflex (ported) — flexible for different boot sizes and sound preferences
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Weight: 4 kg (8.8 lb.) — substantial build quality for a Dieci series subwoofer
Advanced Technologies
Polypropylene Cone with Mica Injection: The DS 30.3's cone is made from polypropylene reinforced with mica particles. Polypropylene is already a strong choice for subwoofer cones — it's lightweight, stiff, and naturally moisture-resistant. The mica injection adds further rigidity without adding significant weight, which means the cone can move quickly and accurately even at high excursion levels. The result is bass that stays tight and controlled rather than becoming loose and boomy at high volume.
Butyl Rubber Surround: The surround is the flexible ring that connects the cone to the basket and allows it to move in and out. The DS 30.3 uses butyl rubber rather than the foam surrounds found in cheaper subwoofers. Butyl rubber is significantly more durable — it doesn't degrade in heat or humidity the way foam does, and it maintains consistent compliance (stiffness) over time. In Indian conditions, where temperatures and humidity levels can be extreme, this is a meaningful advantage for long-term reliability.
Efficient Cooling System: At high power levels, the voice coil generates significant heat. If that heat isn't dissipated quickly, it causes thermal compression — the subwoofer gets quieter and less dynamic as it heats up — and eventually leads to voice coil failure. The DS 30.3 is designed with an efficient cooling system that draws air through the motor structure to keep the voice coil temperature under control. This allows the subwoofer to maintain consistent output during extended high-power listening sessions.
High-Density Ferrite Magnet (115mm): The DS 30.3 uses a large 115mm high-density ferrite magnet assembly. A larger, denser magnet produces a stronger magnetic field in the gap where the voice coil sits, which translates directly to better motor force, tighter bass control, and higher sensitivity. The 115mm magnet is notably large for a Dieci series subwoofer, giving the DS 30.3 a motor strength that punches above its price point.
Sealed and Reflex Enclosure Compatibility: The DS 30.3 is designed to work in both sealed and reflex (ported) enclosures. A sealed enclosure gives you tighter, more accurate bass with a gradual roll-off below the tuning frequency — ideal for music that demands precision. A reflex enclosure gives you higher output and deeper extension at the cost of some accuracy — better for those who want maximum impact. The DS 30.3's Xmech and compliance parameters are tuned to perform well in both, giving you the flexibility to choose based on your boot space and sound preference.
Benefits
- 🎵 Adds the deep bass that speakers alone can never produce
- 🔊 1000W peak handles serious amplifier power without distortion
- 🌡️ Butyl rubber surround and polypropylene cone built for Indian heat and humidity
- ⚡ Cooling system maintains consistent output during long, high-power sessions
- 🔧 Works in sealed or ported boxes — choose the enclosure that fits your boot
- 🎯 28Hz low-end extension — you feel it as much as you hear it
- 📦 Single voice coil — simple, clean wiring to any mono amplifier
Who Should Buy the Hertz DS 30.3?
- Car audio enthusiasts building their first subwoofer setup who want a reliable, high-quality 12-inch driver
- Anyone upgrading from a budget subwoofer to a proper European audio brand
- Drivers who want deep, controlled bass without sacrificing boot space to an oversized enclosure
- Those pairing the DS 30.3 with a mono amplifier in the 200–500W RMS range
- Enthusiasts building a matched Hertz Dieci system — subwoofer, coaxials, and tweeter from the same series
- Anyone who wants a subwoofer that works in both sealed and ported boxes for installation flexibility
- Owners of sedans, hatchbacks, and SUVs with standard boot space looking for a 12-inch sub that fits
Technical Specifications
| Specification |
Value |
| Model |
Hertz DS 30.3 |
| Series |
Dieci |
| Component Type |
Subwoofer |
| Driver Size |
12 inch / 300 mm |
| Peak Power Handling |
1000 W |
| Continuous (RMS) Power |
250 W |
| Impedance |
4 Ohm |
| Voice Coil Type |
Single Voice Coil (SVC) |
| Voice Coil Diameter |
38 mm (1.5 in.) |
| Frequency Response |
28 Hz – 300 Hz |
| Mechanical Excursion (Xmech) |
9 mm |
| Magnet Size |
115 x 50 x 25 mm (4.5 x 2 x 1 in.) |
| Magnet Type |
High-density flux ferrite |
| Cone Material |
Polypropylene with mica injection |
| Surround Material |
Butyl rubber |
| Enclosure Type |
Sealed or reflex (ported) |
| Cooling System |
Yes (efficient heat dissipation design) |
| Weight |
4 kg (8.8 lb.) |
Why Choose Dolphin Accessories?
- ✅ 100% Genuine Products — every product is sourced directly from authorised distributors
- ✅ Expert Guidance — our team understands car audio and can help you choose the right amplifier and enclosure for this subwoofer
- ✅ Pan-India Delivery — we ship to all major cities and towns across India
- ✅ Secure Packaging — subwoofers are packed carefully to arrive in perfect condition
- ✅ After-Sales Support — we're here to help after your purchase, not just before it
- ✅ Trusted by Enthusiasts — thousands of car audio upgrades delivered across India
Frequently Asked Questions
Q: What size is the Hertz DS 30.3 subwoofer?
A: The DS 30.3 is a 12-inch (300mm) subwoofer. It's the most popular subwoofer size for car audio, offering the best balance between deep bass extension and manageable enclosure size.
Q: What amplifier power does the Hertz DS 30.3 need?
A: The DS 30.3 has a continuous (RMS) power rating of 250W at 4 Ohm. For best results, pair it with a mono amplifier rated between 200W and 500W RMS at 4 Ohm. Avoid amplifiers that significantly exceed the RMS rating, as this can damage the subwoofer over time.
Q: What is the impedance of the Hertz DS 30.3?
A: The DS 30.3 is a 4 Ohm single voice coil (SVC) subwoofer. It presents a 4 Ohm load to your amplifier, which is the most common impedance for mono amplifiers.
Q: What enclosure type does the Hertz DS 30.3 work in?
A: The DS 30.3 is designed for use in both sealed and reflex (ported) enclosures. A sealed box gives tighter, more accurate bass. A ported box gives higher output and deeper extension. The choice depends on your boot space and sound preference.
Q: What is the Xmech of the Hertz DS 30.3?
A: The mechanical excursion (Xmech) is 9mm. This is the maximum physical travel of the cone before it reaches its mechanical limits. A higher Xmech allows for higher output at low frequencies without distortion.
Q: What does the frequency response of 28Hz to 300Hz mean?
A: It means the DS 30.3 can reproduce bass frequencies from 28Hz — which is deep sub-bass, felt more than heard — up to 300Hz, which covers the upper bass range. In a typical system, you'd set your amplifier's low-pass filter between 80Hz and 120Hz so the subwoofer only handles the bass frequencies.
Q: Why does the DS 30.3 use a polypropylene cone with mica injection?
A: Polypropylene is lightweight, stiff, and moisture-resistant — ideal for subwoofer cones. The mica injection adds further rigidity without adding weight, which keeps the bass tight and controlled even at high excursion levels.
Q: Why is a butyl rubber surround better than foam?
A: Butyl rubber is significantly more durable than foam. Foam surrounds degrade in heat and humidity over time — a real problem in Indian conditions. Butyl rubber maintains its properties for much longer, keeping the subwoofer's bass response consistent over years of use.
Q: Is the Hertz DS 30.3 suitable for Indian weather conditions?
A: Yes. The butyl rubber surround and polypropylene cone are both resistant to heat and humidity, making the DS 30.3 a reliable choice across India's varied climate conditions.
Q: Can I use the Hertz DS 30.3 in a bandpass enclosure?
A: The DS 30.3 is specified for sealed and reflex enclosures. Bandpass enclosures are not mentioned in the product specifications. We recommend sticking to sealed or ported designs for reliable, predictable performance.
Q: How does the DS 30.3 fit into a Hertz Dieci system?
A: The DS 30.3 is part of the Hertz Dieci series, which also includes the DCX coaxial speakers and DT 24.3 tweeter. Pairing the DS 30.3 with Dieci coaxials and a Dieci tweeter gives you a complete, matched Hertz system with consistent sound character across all frequency ranges.
Q: Is this product genuine and covered by warranty?
A: Yes. Dolphin Accessories sells 100% genuine Hertz products sourced from authorised distributors. Warranty terms follow Hertz India's standard policy — contact us after purchase for warranty support.
