Devialet is a French audio technology company that produces a line of speakers (Phantom) and amplifiers (Expert).

In 2004, engineer Pierre-Emmanuel Calmel, invented the Analog Digital Hybrid (ADH) audio technology that is the basis of Devialet's products.

Three years later, in 2007, he developed an amplifier prototype using the ADH technology, and founded Devialet along with Quentin Sannié and Emmanuel Nardin.

[9] Devialet released two new products in 2016: the "Gold Phantom" speaker capable of producing sound volumes of up to 108 decibels[10] and the Expert PRO amplifier.

[11] In November 2016, Devialet raised €100 million ($106 million) in a funding round led by Ginko Ventures, Foxconn, Jay-Z's Roc Nation, Andy Rubin's Playground Global, Groupe Renault, the Sharp Corporation, and Korelya Capital among others.

[12][13] In October 2017, it entered into a 10-year agreement with the Paris Opera to build a "sound discovery room" in the Palais Garnier.

[15][16] Quentin Sannié, who had been the CEO of Devialet from its foundation, stepped down from the role in March 2018 and was replaced by Frank Lebouchard.

[9] In June 2016, the company released an upgraded "Gold Phantom" speaker with 4,500 watts of power that was capable of producing sound volumes of up to 108 decibels.