| http://www.w3.org/ns/prov#value | - In KEF: 50 Years of Innovation in Sound, the authors assert that KEF reduced the average size of bass-rich home loudspeakers from 9???10 cubic feet (250???280 l) to about 2 cubic feet (57 l), based on the work on the acoustic-suspension woofer at Acoustic Research; the company pioneered large-scale production of drivers with cones made of materials other than paper, and the application of fast F
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