TOKYO--(BUSINESS WIRE)--Mitsubishi Electric Corporation (TOKYO:6503) announced today it has developed an advanced technology for manufacturing boron-carbide diaphragms used in hi-fi loudspeakers, applying an optimal diaphragm build-up method to realize the fastest sound speed of any commercially available boron-carbide diaphragm, resulting in improved sound quality. Mitsubishi Electric will apply its new technology in home and automotive acoustic products and audiovisual systems. Boron-carbide