Hertz ML 1800.3 Legend 7" Midrange Woofer

Most car speakers make you choose between accuracy and power. The Hertz ML 1800.3 Legend was built to give you both. Developed for competition-level car audio, this 7" woofer combines the tonal precision of the ML 1650.3 Legend with a larger emission surface, a 50 mm voice coil, and Hertz's Boundary Free surround technology — so you get deep, controlled bass without sacrificing the midrange detail that makes music sound real. If you're serious about your car audio, this is the woofer that belongs in your door.

What is this Product?

The Hertz ML 1800.3 Legend is a 7" (180 mm) car audio midrange woofer from Hertz's flagship Legend series. It handles 200W continuous (400W peak) at 4 Ohm impedance and covers a frequency range of 38 Hz to 6,000 Hz. It was developed specifically for car audio enthusiasts and competition participants who need a woofer that delivers both accurate timbre and extended low-frequency output. Every aspect of its design — from the FEA-optimised neodymium magnet to the Boundary Free surround — was refined through extensive in-car voicing sessions and Klippel® measurement testing.

Why Choose This Product?

• ✅ 400W peak power handling for high-powered amplifier setups
• ✅ 50 mm CCAW double-layer voice coil for exceptional power handling and compression-free reproduction
• ✅ Neodymium magnet optimised with FEA simulation for real dynamics and precise control
• ✅ Boundary Free IIR rubber surround for wider cone excursion and deeper bass extension
• ✅ Exponential V-cone geometry for linear, wide-dispersion midrange response
• ✅ Klippel®-tested design — measured and refined to real-world in-car performance standards
• ✅ Die-cast aluminium grille with diamond-cut Hertz logo included
• ✅ Competition-grade build quality in a 7" form factor

Key Features

• Component Type: Woofer — designed for use in a component speaker system
• Speaker Size: 180 mm (7") — larger emission surface than a standard 6.5" for more air movement
• Peak Power: 400W — built for high-powered amplifier pairings
• Continuous Power: 200W — rated for sustained, real-world listening at high volumes
• Impedance: 4 Ohm — compatible with most aftermarket amplifiers
• Frequency Response: 38 Hz to 6,000 Hz — deep bass through clear midrange
• Voice Coil Diameter: 50 mm (2") CCAW double-layer — larger coil for better heat dissipation and power handling
• Magnet Type: Neodymium — optimised with FEA simulation for maximum efficiency and low distortion
• Cone Material: Pressed-pulp with cotton fibres — stiff yet lightweight for wide frequency response
• Surround: Boundary Free IIR rubber — allows wider excursion than a standard surround
• Xmech: ±10 mm (0.4") — generous mechanical excursion for deep, impactful bass
• Magnet Size (D × d × h): 90 × 60.7 × 5 mm (3.54 × 2.39 × 0.2")
• Weight (per speaker): 1.71 kg (3.77 lbs)
• Basket: Three-spoke acoustically transparent anti-resonant aluminium alloy with built-in venting holes
• Grille: Die-cast aluminium with diamond-cut Hertz logo — included in the box

Advanced Technologies

FEA-Optimised Neodymium Magnet with CNC Machined Low-Carbon Plates: Hertz's R&D team used Finite Element Analysis (FEA) simulation to design the magnetic circuit from the ground up. The result is a neodymium magnet that delivers a stronger, more uniform magnetic field than a conventional ferrite magnet of the same size. The CNC machined plates use very low carbon content iron, which maximises magnetic permeability and keeps distortion low even when the speaker is pushed hard at high power levels. The aluminium-covered pole piece further linearises impedance modulation, reducing a common source of distortion in high-excursion woofers.

50 mm CCAW Double-Layer Voice Coil on Polyamide Former: CCAW stands for Copper-Clad Aluminium Wire — it combines the conductivity of copper with the lightweight properties of aluminium. A 50 mm diameter is significantly larger than the 36–38 mm coils found in most 6.5" woofers, which means more surface area to dissipate heat and a stronger motor force. The double-layer winding increases inductance and power handling further. Wound on a Polyamide former, this voice coil is built to handle sustained high-power use without thermal compression — meaning the bass stays tight and punchy even during long, loud listening sessions.

Exponential V-Cone® Geometry: The cone shape isn't just about looks. Hertz's Exponential V-cone uses a specific geometric profile that optimises both linearity (how accurately the cone moves in response to the signal) and dispersion (how evenly the sound spreads across the listening area). This is particularly important in a 7" woofer, where maintaining controlled midrange dispersion alongside deep bass extension is a genuine engineering challenge. The pressed-pulp cotton-fiber material adds stiffness without adding mass, which keeps the cone's resonance behaviour predictable and minimises break-up at higher frequencies.

Boundary Free IIR Rubber Surround: The surround is the flexible ring that connects the cone to the basket and controls how far the cone can travel. In a competition-grade woofer, the surround is under extreme stress at high excursions. Hertz developed the Boundary Free surround specifically to handle these conditions — it allows the cone to travel further than a conventional surround without losing symmetry or stability. The practical result is a wider effective emission surface compared to a standard speaker of the same diameter, which means the cone moves more air and produces more acoustic pressure at low frequencies.

Klippel® Measurement and In-Car Voicing: The ML 1800.3 Legend wasn't just designed on paper. Hertz built multiple prototypes and tested each one using the Klippel® measurement suite — the industry standard for characterising non-linear distortion in loudspeakers. The results were used to refine the design iteratively. The final voicing was done in real cars, not just in an anechoic chamber, so the speaker's tuning reflects how it actually sounds in a door installation rather than in ideal lab conditions.

Benefits

• 🎵 Deep, impactful bass that you feel as much as you hear — without muddiness
• 🔊 Clean, accurate midrange that lets vocals and instruments breathe naturally
• ⚡ Handles high-powered amplifiers without thermal compression or distortion
• 🏆 Competition-grade engineering in a package that works equally well in a daily driver
• 🔧 Acoustically transparent basket and venting holes minimise back-pressure for cleaner bass
• 💎 Premium diamond-cut aluminium grille included — looks as good as it sounds
• 🎯 Klippel®-verified performance — what's on the spec sheet matches real-world listening

Who Should Buy This Product?

• Car audio enthusiasts building a high-end component speaker system and need a woofer that can keep up with a premium tweeter and crossover
• Competition car audio participants who need a woofer that scores on both accuracy and output
• Audiophiles who want the tonal accuracy of the Hertz Legend series with more low-frequency extension than a 6.5" can provide
• Anyone running a high-powered amplifier (200W+ RMS per channel) who needs a woofer rated to match
• Enthusiasts who want a speaker that has been properly measured and tuned — not just spec'd on paper

Technical Specifications

Why Choose Dolphin Accessories?

• ✅ 100% Genuine Products — Every product is sourced directly from authorised distributors. No counterfeits, no grey-market imports.
• ✅ Expert Guidance — Our team understands car audio at a technical level. We'll help you match the right woofer to your amplifier, crossover, and installation goals.
• ✅ Pan-India Delivery — We ship to every part of India, with packaging designed to protect precision audio equipment in transit.
• ✅ Secure Packaging — Competition-grade speakers deserve competition-grade packing. Every order is packed to arrive in perfect condition.
• ✅ After-Sales Support — Questions about installation, crossover settings, or warranty? Our team is available after your purchase to help you get the best out of your system.
• ✅ Trusted by Enthusiasts — From daily drivers to competition builds, thousands of car audio enthusiasts across India trust Dolphin Accessories for their upgrades.

Frequently Asked Questions

Q: What size is the Hertz ML 1800.3 Legend?
A: It is a 7" (180 mm) woofer. This is slightly larger than the common 6.5" size, which gives it a bigger emission surface and more air-moving capability for deeper bass.

Q: What is the power handling of the Hertz ML 1800.3 Legend?
A: It handles 200W continuous (RMS) and 400W peak. You'll want to pair it with an amplifier that can deliver at least 150–200W RMS per channel to get the best out of it.

Q: Is the ML 1800.3 Legend a full-range speaker or a woofer only?
A: It is a woofer, covering 38 Hz to 6,000 Hz. It is designed to be used as part of a component speaker system alongside a separate tweeter and crossover — it is not a standalone full-range speaker.

Q: What is the impedance of the Hertz ML 1800.3 Legend?
A: The impedance is 4 Ohm, which is standard for aftermarket car audio amplifiers.

Q: What does CCAW voice coil mean?
A: CCAW stands for Copper-Clad Aluminium Wire. It combines the electrical conductivity of copper with the light weight of aluminium, giving you better power handling and less thermal compression compared to a standard aluminium voice coil.

Q: What is the Boundary Free surround and why does it matter?
A: The Boundary Free surround is Hertz's proprietary rubber surround design that allows the cone to travel further than a conventional surround without losing stability. This means the speaker can move more air, producing deeper and more impactful bass — especially important in a door installation where bass can be hard to achieve.

Q: What is FEA simulation and how does it improve this speaker?
A: FEA stands for Finite Element Analysis — a computer simulation method used to model and optimise the magnetic circuit before any physical prototype is built. Hertz used FEA to design the neodymium magnet and pole piece geometry, resulting in a more uniform magnetic field, lower distortion, and better dynamic control than a conventionally designed magnet system.

Q: What is the Xmech rating of the ML 1800.3 Legend?
A: The Xmech is ±10 mm (0.4"), which is the maximum mechanical excursion of the cone before it hits a physical limit. A higher Xmech means the speaker can move more air and produce deeper bass at higher volumes.

Q: Does the Hertz ML 1800.3 Legend come with a grille?
A: Yes, a die-cast aluminium grille with a diamond-cut Hertz logo is included in the box.

Q: What amplifier should I pair with the Hertz ML 1800.3 Legend?
A: Look for an amplifier that delivers 150–200W RMS per channel at 4 Ohm. This will allow you to run the speaker at its continuous power rating without clipping. Contact our team at Dolphin Accessories for specific amplifier pairing recommendations.

Q: Was the Hertz ML 1800.3 Legend tested with Klippel® equipment?
A: Yes. Hertz used the Klippel® measurement suite during development to characterise and minimise non-linear distortion. The design was also refined through in-car voicing sessions, so the final tuning reflects real-world performance rather than just lab measurements.

Q: How do I buy the Hertz ML 1800.3 Legend from Dolphin Accessories?
A: Add it to your cart and place your order online. We offer pan-India delivery with secure packaging. If you need help with compatibility, amplifier matching, or installation advice before buying, our team is ready to assist.