Magnetic Speaker Systems
Speakers have been utilising permanent magnets since 1930 and in the last 87 years the core technology has remained largely unchanged. However, with the advent of new materials and ever increasing strength of Neodymium magnets the speaker is constantly been re-invented. None more striking than the B&W Nautilus, now superseded in terms of audio quality but still at the pinnacle of design.
Speakers are a type of transducer which can transfer the electric signal to the acoustic signal. The sound quality of the speaker is largely depended on the speaker magnets. Speakers can be classified to internal magnetic type and external magnetic type according to the magnetic circuit structure. Speakers also can be divided into the moving-coil type, electromagnetic type, piezoelectric type, and capacitive type base on the transducer principle. As the most important vocal style of modern speakers, the early moving-coil speakers were adopted electromagnetic driving due to the lag development of permanent magnet. With the advent of AlNiCo magnets, moving-type speakers came into permanent driving from electromagnetic driving, thus stability and authenticity of sound largely enhanced.
HSMAG provide many speaker magnet systems from a simple magnet to a complex magnetic assembly and the necessary magnetising system required to facilitate easy assembly.
Magnetic Speaker Systems
Speaker applications include;
Pinch Field Driver
Radial Magnets – Pure Radial Driver
We offer design and FEA modelling solutions to enable cost effective and rapid design and development of virtual speaker sets so that only a final prototype system needs to be built to facilitate a new design, saving considerable expense.
Typical Services include;
Magnet Supply – All Materials
Magnetic Property Control
Design Services – FEA
Magnetisers and Bespoke Fixtures.
Magnetic performance has direct influence on the sound quality when magnet’s volume and voice coil are same. Speaker magnets are mainly including AlNiCo magnets, ferrite magnets, and sintered Neodymium magnets. As the earliest speaker magnets, AlNiCo magnets were generally served to internal magnetic type speakers. Its power relatively low and frequency range is narrow. Ferrite magnets are normally utilized by external magnetic type speakers. Due to the limitations of magnetic performance, ferrite magnets need the certain volume to fulfill the driving force of the speaker. Ferrite magnets have excellent cost performance, but the drawback is low volume and narrow frequency ranges. Magnetic performance of sintered Neodymium magnets is significantly higher than either AlNiCo or ferrite magnets, and it is also mostly used speaker magnets at present.
We also offer advice on incorporating new materials like the Soft Magnetic Composites, typically used in motor systems to reduce eddy currents but also usable in speaker systems, especially post assembly magnetised systems, to reduce eddy currents and transient effects.
As speakers are constantly improved and made thinner, magnet systems have evolved to meet these needs and HSMAG are available to help with whatever your design may need, please contact us for more information on how we can help your project move forward.
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