JVC Develops “Pulsating Sphere Speaker”
JVC announces the development of a “Pulsating Sphere Speaker” claimed to be very close to the "ideal sound source", and application for 17 related patents. Since JVC launched its first sphere speaker “GB-1” in 1967, it has worked toward such an ideal sound source for a natural, near perfect sound field.
The “Pulsating sphere” is synonymous with an ideal sound source, a goal for sound engineers for over sixty years. Some reasons why the pulsating sphere is an ideal sound source include: uniform wave front projection in every direction; no irregularity in acoustic impedance; no diffraction from a cabinet; no near-range sound-field problems caused by flat sound sources. Because of these qualities, the speakers lack any of the sonic quirks of typical speakers, making it possible to design the signal paths in such a way that listeners feel as if speakers do not exist.
JVC designed the pulsating sphere speakers with a diameter of 10 cm for “near-ideal performance”. Together they exhibit less than ±1 dB directional variation up to 10 kHz. Each diaphragm is linked only to a dynamically driven voice coil, with an internally mounted driver circuit, resulting in sound waves with uniform amplitude and phase in every direction. Each five-sided diaphragm is connected so the entire surface functions as an emitter. This construction results in clearer, undistorted sound because it renders unnecessary conventional cabinets and frames that could cause reflection and diffusion.
JVC used computer simulation to optimize the speaker’s design, resulting in diaphragms with uniquely flat frequency characteristics that remain stable up into high frequency range. Along with many other innovations in the areas of axial motion and input range, this led JVC to apply for 17 pulsating sphere technology related patents.
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