Assertion: horn loudspeaker | /r/CapableOf | use shaped waveguide
Facets:
value: in front
type: LOCATION
Source sentences:
text: Horn loudspeakers use a shaped waveguide in front of or behind the driver to increase the directivity of the loudspeaker and to transform a small diameter, high pressure condition at the driver cone surface to a large diameter, low pressure condition at the mouth of the horn.