| 摘要 |
A horn or waveguide public address unit, enabling to adapt the dispersion characteristics of the horn or waveguide. The unit is provided with at least one profiling component ( 21 a , 21 b) constituting a removable dispersion shaper, capable of being mounted on the inner wall of the horn ( 13 ) or waveguide between the throat ( 17 ) and the mouth ( 19 ) thereof. |
