Nothing Says Rock ‘n’ Roll Like a Speaker as Loud as a Jackhammer
A Devialet SAS Phantom wireless speaker sits on display at the Analogue Digital Hybrid amplification technology company’s showroom in Paris, France. (Photographer: Marlene Awaad/Bloomberg)

Nothing Says Rock ‘n’ Roll Like a Speaker as Loud as a Jackhammer

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(Bloomberg) -- Startup Devialet, which makes the high-end Phantom music speaker popular with pop-star A-listers, wants to broaden its appeal by selling a more affordable wireless version to a wider...
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