Sonos has improved on almost every aspect of the Move 1, but since the first speaker was so good it's hard to notice the changes.
Sonos Move review - SoundGuys
Sonos Move 2 Review: Is the upgrade enough?
Sonos Move 2 Review: Is the upgrade enough?
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Sonos Move 2 Review
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Sonos Move 2 Review: Two Key Improvements Make for a Better Speaker - CNET