Hertz ML 280 [5/36] Technology

The magnet of a long excursion midwoofer has to comply with various important parameters,

some of which may be in contrast with the others. You need to be able to wisely mix different

technical solutions and thoroughly examine every choice, carefully considering pros and cons.

Magnetic flux symmetry around the gap, field intensity and width, mobile voice coil inductance

modulation, compactness and lightness: these are some of the fundamental features to get

state-of-the-art performance.

Plates employ the same ferromagnetic material designed for ML 280 tweeter, with high saturation

level; they are machined through high precision process, through numerical control equipment.

The magnet geometry generates a perfectly linear induction field, up to mobile voice coil extreme

excursions. The flux reaches a value which was inconceivable a few years ago: 1.2 Tesla in the

midbass gap, with 36 mm diameter voice coil, ensure bursting dynamics, very high efficiency,

very good dissipation.

ML 1600 Magnet FEM simulation

ML 1600 motor core is a new sized neodymium ring,

especially moulded for this component. This material

uses an innovative rare earths mixture which provides

total thermal stability.

Neodymium Magnet

ML 1600

Magnet section

ML 1600

The design and development of MILLE components magnets employed advanced FEM

(Finished Elements Modelling) technology. Little differences in the magnetic structure can

enhance musical and acoustic performance. In HERTZ laboratories, every detail is carefully

analysed and assessed.

When designing the magnet of a tweeter, it is important to concentrate energy in a limited area

around mobile voice coil. The mechanical excursion of this component is very limited but

accelerations speed is very high. For mobile voice coil very good control, you need to have high

magnetic induction in the gap and to use first-grade ferromagnetic materials. ML 280 tweeter

employs uses high thermal threshold, REN

neodymium double magnet and very low carbon

percentage iron, especially designed for it. The magnet geometry creates a 1.6 Tesla induction

field, with perfect lines symmetry.

Magnet detailed drawing

ML 280

Technology

English

ML 280 Magnet FEM simulation