4295 OmniSource Loudspeaker

For most building acoustics measurements, the sound source must radiate sound evenly in all directions to give reproducible and reliable results. Hence the relevant standards for the measurement of building acoustics (ISO 140 and ISO 3382) require that an omnidirectional sound source be used.
Type 4295 OmniSource Sound Source Type 4295 presents a new solution to omnidirectional sound source design. OmniSource is optimised for the measurement of room acoustic quantities, such as reverberation time, sound distribution and spatial decay.

The patented principle of the OmniSource uses a single high-power loudspeaker, radiating through a conical coupler to a circular orifice. The size of the orifice and the shape of the OmniSource have been carefully engineered to radiate sound evenly in all directions. Thus, the OmniSource fulfils the national and international standards for omnidirectional sound sources. Despite its compact dimensions and low weight, the OmniSource is still capable of emitting a sound power of 105 dB re 1 pW.