The new transducer is small and can only be used in ear pieces at the moment, but the technology is advanced enough that it can be applied to headphones in the near future.
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With a graphene speaker, there are fewer resonances to begin with, and what there is can be electronically controlled rather than mechanically, as is needed with electro-mechanical speakers today. This usually makes it less efficient and limits the response to a somewhat narrow frequency band. One of the difficulties for loudspeaker engineers is that speaker design revolves around damping the various resonances in order for the speaker to have a flat response. The pair have made what is essentially a solid state loudspeaker using the ultra light and thin substance graphene sandwiched between two silicon electrodes to produce a transducer that has a fairly flat 20Hz to 20kHz frequency response.
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Electrostatic loudspeakers were introduced in 1959 and while they remain the darling of audiophile set, can't take the beating of professional use and have an inherent low frequency response problem.īut that all could change thanks to a new breakthrough by two researchers from the University of California Berkley. Sure it's evolved to become much more efficient with a flatter and wider frequency response, but we're still talking about the same coil of wire mounted to a diaphragm that moves through a magnetic field that was used 138 years ago. Loudspeaker technology hasn't changed all that much since Alexander Graham Bell invented the first speaker in 1876.