For once, the wireless surround speakers on JBL’s first Dolby Atmos-enabled soundbar are, in fact, truly wireless.

The “wireless” surround speakers that come with many soundbars are almost never truly wireless; instead, they require either power cables or a wired connection to a “wireless” sound module (which itself will need a wired power source). That makes the wireless surround speakers that come with the JBL Bar 9.1 notable exceptions.
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https://www.techhive.com/article/3540450/jbl-bar-9-1-soundbar-review.html