Hertz MLK 165 [17/26] Technology

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English

Magnet FEM simulation

ML 28

Technology

A magnet designed for a high excursion mid-woofer must comply with several essential

parameters: magnetic flux symmetry around the air gap, field intensity and width, while still being

compact and lightweight. These are just some of the vital elements to achieve the best

performance. The massive motor of the ML165 includes these features, ensuring a very high

thermal stability and explosive dynamics.

Every detail undergoes thorough analysis and assessment. Again, we used state-of-the-art Finite

Elements Modeling (FEM) technology to develop the magnets of the Mille components.

The ML 28 tweeter features a double neodymium and iron magnet with a very low percentage

of carbon, specifically developed for this transducer. The magnet geometry creates a 1.6 Tesla

induction field, with a perfect symmetry. The mechanical excursion of this component is limited,

but the acceleration capability is burning.

Simplifying installation means achieving extraordinary performance even in the most challenging

conditions, without the need to entirely modify the interior of the vehicle.

The acoustic load provided to the rear of the tweeter dome drastically affects its performance;

just the same occurs with a larger diameter midrange or woofer. The traditional tweeter geometry

creates strong asymmetries, since the membrane has free space in the back, while at the same

time, it is loaded on its side by the very small volume between the center pole piece and the dome.

In the ML 28 we have designed eight tuning ports that generate a resonance-free match with

the rear damping chambers. The volume and proportions of these ports and the use of special

material in the chambers provide excellent damping for the rear of the dome, for a natural, clear,

dynamic sound. Located under the dome and following its profile, is another kind of acoustic

material, thicker and more effective at high frequencies. This eliminates the last rear wave anomalies

and generates utterly amazing detail and naturalness.

Magnet detailed drawing

ML 28

Section

ML 28

ML 28 resonances

Traditional Tweeter resonances