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The Royal Institute of British Architects
Founded in 1834 for the general advancement of Civil Architecture, and for promoting and facilitating the acquirement of the knowledge of the various arts and sciences connected therewith, the Royal Institute of British Architects is one of the UK's most establish educational institutions. We are proud to offer a Continued Professional Development course on their behalf.
In 1924 two General Electric researchers patented the modern moving coil loudspeaker that would became the standard design for all modern loudspeakers. GE’s motivation was to sell electricity, not sound systems, so they gave away the intellectual property to encourage the uptake their new service. This was a key factor in initial growth of this technology.
Fundamentally, a conventional loudspeaker consists of a coil of wire that sits within a magnetic field. The coil is attached to a rigid diaphragm, usually a cone, and when an electrical current passes through the coil movement is created. This, in turn, causes the cone to move backwards and forwards, compressing and stretching the air in front of it that we perceive as sound.
Characteristics of the Cone Speaker
Inherent to the sound created by these diaphragms is a narrowing of dispersion as the frequency (or pitch) increases. The larger the diaphragm, the worse the effect becomes. This is why the majority of conventional speakers use more than one diaphragm of different sizes (i.e. woofers and tweeters)
Characteristics of Vibrational Panel Technology (VPT)
VPT loudspeakers are far more analogous to musical instruments that produce sound from their structures resonating. An advantage of VPT technology is that the sound produced is more diffuse and does not become more directional as the frequency increases.