The TV will then downmix the DD+ soundtrack to obtain a PCM stereo soundtrack, and the original, 5- or 7-channel mix will be lost. If Dolby Atmos metadata is present, your older Dolby Digital receiver will not recognize any of the data and will tell you it is not compatible. However, as compression rates rise and Dolby Atmos metadata is added, this is becoming less common. Sometimes, the Dolby Digital Plus soundtrack contains a Dolby Digital core. With Dolby Digital Plus, it would be possible to take the same approach, and yet this isn’t always the case. If the receiver doesn’t provide a list containing Dolby TrueHD, then the source transmits the Dolby Digital core. This on-the-fly extraction is quite simple in practice: the optical player or TV detects the receiver’s audio decoding abilities via its HDMI controller. The Denon AVR-X2600H A/V receiver is compatible with Dolby Digital Plus and Dolby Atmos.
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