Hertz Mille Legend ML 1800.3 7 Inch 18cm Midrange Woofer Speaker 200w RMS Pair

The Hertz Mille Legend ML 1800.3 is a 7-inch (180 mm) midrange woofer pair rated at 200 W RMS, featuring a 50 mm voice coil and neodymium magnet. It is part of Hertz's flagship Mille Legend range, designed for competition sound quality installations requiring extended low-frequency performance.

It pairs with the MLK 700.3 midrange and tweeter set to build a complete, actively filtered Mille Legend system.

Key specifications

• Size: 180 mm (7 inch)
• Power handling: 200 W continuous, 400 W peak
• Impedance: 4 ohms
• Voice coil: 50 mm
• Frequency response: 38 Hz to 6 kHz
• Magnet: neodymium
• Cone: pressed pulp with cotton fibres
• Sold as: pair, with grilles

ML 1800.3 Legend

The ML 1800.3 is designed for competition enthusiasts who need a woofer combining the tonal accuracy of the ML 1650.3 Legend with greater low-frequency extension. The larger emission surface, higher power handling, and 50 mm voice coil deliver the control and dynamics required in demanding installations.

• Neodymium magnet optimised with FEA simulations for real dynamics and maximum control.
• Very low carbon content CNC machined plates for maximum magnetic permeability and low distortion at high power levels.
• Aluminium covered pole for linear impedance modulation and low distortion.
• 50 mm CCAW double-layer voice coil wound on a Polyamide former for exceptional power handling and compression-free reproduction.
• Exponential V-cone® with optimised geometry for maximum linearity and dispersion.
• "Boundary Free" IIR rubber surround for better efficiency and wider mid-bass frequency range.
• Pressed-pulp cone with cotton fibres, combining stiffness and low weight for wide frequency response and limited break-ups at high frequencies.
• Three-spoke, acoustically transparent anti-resonant aluminium alloy basket with built-in venting holes.
• CNC machined diamond-cut basket edge featuring the Hertz logo.
• Die-cast aluminium factory-supplied grille featuring a diamond-cut aluminium Hertz logo.

Boundary Free Surround technology

The "Boundary Free Surround" is a new surround-to-basket bonding system developed by Hertz's electro-acoustic designers. It provides a wider cone emission surface for a given driver diameter, allowing the cone to move a greater mass of air and produce more acoustic pressure. This ensures maximum stability and symmetry at high excursions, maintaining impact and extension into the low-frequency range.

Development involved extensive in-car voicing sessions, multiple prototypes built using FEA simulation, and a full suite of measurements carried out with the Klippel® measurement system.