ML 1800.3 Legend car audio woofers has been thought and designed for the enthusiasts attending contests who need a component merging the timbre accuracy of ML 1650.3 Legend to a wider extension to the low frequencies thanks to the large emission surface, higher power handling and control which only a 50 mm voice coil can ensure. To get to these results, the R&D staff performed extensive in-car voicing sessions, after building several prototypes with the FEA simulation method and testing them with a wide array of measurements carried out with the Klippel® suite. Like in the suspensions of competition cars, the surround must stand the most extreme working conditions to ensure maximum stability and symmetry at high excursions, and so to achieve impact and extension to the low frequency range. For this reason, the electro-acoustic designers developed a new surround-basket gluing system called “Boundary Free Surround”. This technology, provides the ability to achieve wider emission surface of the cone compared to speakers with same diameter; that way, the cone manages to move a bigger mass of air, so it produces more acoustic pressure.

Data table

Size mm (in.)	180 (7)
Power Handling - Peak W	400
Power Handling - ContinuousW	200
Impedance Ω	4
Frequency response Hz	38 - 6k
Sensitivity dB SPL	93
Voice coil Ø mm (in.)	50 (2)
Magnet	Neodymium
Cone/Dome	Pressed-pulp cone with cotton fibres

Features

1. Neodymium magnet optimized with FEA simulations for real dynamics and utmost control.
2. Very low carbon content CNC machined plates, for maximum magnetic permeability
and low distortion at high power levels.
3. Aluminium covered pole for a linear impedance modulation and low distortion.
4. 50 mm CCAW double layer voice coil wound on a Polyamide former for exceptional
power handling and compression-free re production even in the most demanding
musical passages.
5. Exponential V-cone® with optimized geometry for utmost linearity and dispersion.
6. “Boundary Free” IIR rubber surround, for better efficiency and wider mid-bass frequency.
7. Pressed-pulp cone with cotton fibres, combining stiffness and lightweight, to achieve
wide frequency response and limited break-ups at high frequency.
8. Three-spoke, very acoustically transparent anti-resonant aluminium alloy basket
featuring built-in venting holes.
9. CNC machined elegant diamond-cut basket edge featuring the Hertz logo.
10. Die-cast aluminium factory provided grille featuring diamond-cut aluminium Hertz logo.

Technologies

V-CONE®
he exponential profile gets very close to the perfect one, providing exceptional dispersion.
BOUNDARY FREE SURROUND
This technology provides the ability to achieve wider emission surface of the cone compared to speakers with same diameter; that way, the cone manages to move a bigger mass of air, so it produces more acoustic pressure. This special surround is built from highly pure IIR butyl rubber, ensuring extraordinary thermal and mechanical linearity.

Data table

Features

Technologies

V-CONE®

BOUNDARY FREE SURROUND

HERTZ

HERTZ 7" ML 1800.3 LEGEND SUBWOOFER