A loudspeaker without a membrane which can be mounted on any flat surface solves aesthetical and technical problems.
This is an archive article published 04.08.2015. Some information may no longer be up to date and in line with the current state. Please contact us in case of interest.
Fans of HiFi sound and similar „audiophils“ usually don´t cover their loudspakers and surely not their membranes. Firstly, to cover a beautiful top-class loudspeaker is almost a sin :-) and naturally all that stands in a way of sound usually influences it in a negative way.
However, totally different situation is in traffic, audio bells, industrial conditions, in various kiosks (POS) and other applications. Here a loudspeaker is usually mounted behind various covers so as to be protected from mechanical damage. For these applications we can use various industrial loudspeakers which are available in dust- and water-proof versions.
If we go even further, applications where even a perforated loudspeaker cover is undesirable - weather from aesthetical or a technical point of view. For these purposes German company Visaton offers elegant solution – “Exciter”. Visaton Exciter is in fact a loudspeaker without a membrane optimized to be mounted on a flat panel, where by a mechanical connection with a given surface a final “loudspeaker” arises.
How does it function?
Do you remember the physics from a primary school and something about Newton´s law of action and reaction? This is exactly the same principle. Electromagnetic field in loudspeker´s coil acts by a force on a front plate of the Exciter and also on a rear part of the loudspeaker (the magnet). As a rear part with a magnet is much heavier than the front plastic one, the loudspeaker has sufficient “reserve” to efficiently wobble a given panel (on which it is mounted). This way a panel becomes a membrane.
To reach the highest possible efficiency, it´s desirable to mount the Exciter on the panel which is relatively thin and lightweight. An extreme example it might be to mount the Exciter on (infinitely) rigid panel and then a rear part with magnet would oscillate, i.e. the sound would be produced only backwards – behind the panel.
It´s easy to imagine, that resulting properties of a sound generated by Exciter are strongly dependent on a panel on which it is mounted. That´s why a frequency response can´t be found in the datasheet. As for mounting – it can be done by screws or by glueing.
Usable materials and shapes:
● the bigger the surface, the better reproduction and volume of low frequencies
● efficiency (and the volume) is higher at light-weight panels
● the panel should be rigid (anti-resonant) and from a non-magnetic material
● „invisible “ loudspeaker
● completely protected from environment influence (weather, water, vandalism,…)
● easy installation
● able to produce quality sound in a wide radiation pattern
● usable on many materials including plexi-glass (acryl) and glass
● lower efficiency in comparison to standard loudspeakers
● devices, which can touch a vibrating panel can cause sound distortion
● acoustics strongly dependent on a material, dimensions and a shape of the panel
Further tips for practical usage as well as a list of suitable materials (panels) can be found in the EX45S, EX60S datasheets as well as in the "Principles of Exciter technology" description.
We´re able to supply you Visaton Exciter in a short leadtime at favourable conditions. Many other Visaton components belong to our standard stock offer. In case of interest even in non-stock types, please contact us at firstname.lastname@example.org.
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Competition with the following question has been published here:
What´s the voice coil diameter of the EX45S?
The correct answer was: 25,4 mm
We have drawn the following winners:
Vojtěch Skládaný [CZ]
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Date of publishing 04.08.2015 When you issue article on your website, please give its source: http://www.soselectronic.com/articles/visaton/visaton-visaton-exciter-an-exciting-loudspeaker-1743