Much of the current research and development in the field of loudspeaker transducers is concerned with the challenges of how to make them both smaller and louder. In some cases this involves novel mechanical designs, and in others it involves the use of signal processing to enable existing designs to be pushed closer and closer to their limits. In relation to the directional characteristics of transducers in different contexts, two studies are reported here. One concerns the effect of a user’s hands on the directional radiation of a mobile phone speaker, and the other deals with the directionality and noise pollution resulting from different configurations of subwoofers in a sound reinforcement application.
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