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Amazon's new multi-room Alexa music feature lets Echo devices work in concert; Sonos, Bose and others coming soon – GeekWire
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How to set up an Alexa multi-room audio system with your Amazon Echo smart speakers
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Best multi-room speakers: 6 top wireless sound systems
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Amazon.com: Rockville 4-Zone Multi Room Audio System w/ (16) 5.25" Black Ceiling Speakers
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