| http://www.w3.org/ns/prov#value | - FIG. 1 is an exemplary embodiment of a reactive sound attenuator cassette in a duct wall 1, consisting of the housing 2 with at least one membrane 3 in front of a cavity 4, a sensor 5, a linear amplifier 6 and an electroacoustic transducer 7 according to the invention;
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