(under subclass 177) Subject matter including structure within the horn which constitutes an obstruction to the sound waves.
(1) Note. The restriction can be an object placed within the horn or a pinch in the horn walls which generally affects the quality or tone of the sound in addition to decreasing the loudness by partially blocking the expected sound path.
SEE OR SEARCH THIS CLASS, SUBCLASS:
187+, for structure which merely divides the horn into plural intensifying portions.
191, for external sound deflectors.
196+, for similar structure located within a sound conveying tube.
