Hertz ML 280 [4/36] Technology

MILLE line components membranes were designed according to the most innovative FEM

softwares (FEM: Finished Elements Modelling) and tested through prototypes, measurements

and technical listening. This process permits to control every step of the project and to

constantly check its evolution.

ML 280 dome has a special profile, exclusively designed by HERTZ: its first section is

hemispheric, the top is hyperbolic. The relation of emitting diameter, membrane height and

surround profile ensures very low Fs without affecting dynamics at mid-high frequency. The

component dispersion is flat also at extreme off-axis response and at ultrasonic frequencies.

ML 1600 “V” CONE has a totally new, HERTZ proprietary exponential geometry. Its contact point

with mobile voice coil uses a very light paper support, which optimises mechanical coupling and

insures very high efficiency. This new geometry provides very flat off-axis response, up to so-far

unbelievable frequencies for a component with this diameter, no break-up phenomena and

optimal damping, for rich, accurate sound in the whole bandwidth.

Membrane profile

ML 280

Membrane profile

ML 1600

Created by nature

Cotton-injected paper fiber, natural resin imbued Tetolon

The materials used for ML 1600 midbass and ML 280 tweeter membranes are created by nature

and treated according to processes perfected in decades. In HERTZ laboratories, tradition

supports innovation.

For ML 1600 cone construction we realised, analysed and studied more than 35 materials,

different in terms of paper fibers composition and impregnating components. The mixture we

selected ensures good stiffness, damping and lightness. No other rigid fiber, composite material

sandwich or metal mould can provide such natural, accurate, dynamic sound.

The fiber we used for ML 280 membrane is a mixture of cotton and silk, in controlled

percentage; together with the natural resin impregnating treatment, it makes the component go

beyond the audible range, like all stiff dome components (metal, rigid fibers) but without

generating the troublesome resonances which characterise this type of technology. The

diaphragm can, thus, vibrate at very high frequencies without coloration and without affecting or

spoiling sound.

Technology

English