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In short- directly NO, there isn't a way to stream any wireless music from the AVR-1913 to the Heos 7 speaker, as the Heos is a Network speaker, and the Denon AVR has no network audio streaming capabilities.
However there is a workaround that requires extra parts, and can send an AV signal from the receiver to the speaker. This requires use of a speaker to line level converter, and a wireless audio sending/receiving unit (the receiving unit would need to be physically plugged into the Heos speaker however).
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