"(of an emission apparatus): the range between highest and lowest frequencies emissable, see sound spectrum. Preferabel to range, because of the latter's use in the topographic sense." 
"(of a receptor): the range of frequencies receivable, from the highest to the lowest." 
- . Glossarial Index. Dans: Acoustic Behavior of Animals. Acoustic Behavior of Animals. Elsevier; 1963.
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