Sound United LLC, parent company to Denon, Polk Audio, Marantz, Definitive Technology, HEOS, Classé, and Boston Acoustics, alongside Fraunhofer IIS, primary developer of the MPEG-H Audio standard, today announced the immediate availability of the MPEG-H 3D Audio format across a wide range of home theater products. The selected Denon and Marantz AV amplifiers and AV preprocessors will receive MPEG-H support via a firmware update.