Hertz ML 1650.3 woofer with grille (165 mm).

Hertz ML 1650.3 (MILLE series) woofer 6.5" (165 mm)

During these past few years the Mille line car audio woofers have been the choice of many enthusiasts looking for extreme performance. 
ML 1650.3 Legend the Hertz designers increased again the limits of achievable performance for components designed for door installation.
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To ensure extraordinary power handling and very high thermal stability even with tracks especially rich of bass frequencies, ML 1650.3 Legend features a 36 mm mobile voice coil. 
This size ensures the best compromise between power handling and high frequency response. 

The cone geometry has been subject of in-depth studies with FEA simulations and measurements performed with the Klippel Scan Vibrometer; all that led to the optimization of the V-cone® profile. 
In the subwoofers and in the woofers, to reproduce the lowest frequency spectrum, the cone needs to move a remarkable amount of air, so it is forced to make long excursions moving like a piston does. 
The V-cone® profile prevents the cone from deforming during its course, ensuring that the “piston” works in a correct position, maximizing the production of acoustic pressure.