Most Rotel systems will allow you to enjoy the benefits of these new audio formats, but the exact method to go about this does vary depending on the model you own.
The 15 series processors and receivers feature HDMI 1.3 hardware and can decode Dolby TrueHD and DTS HD Master Audio signals via the HDMI connection from a Blu-Ray player. Just connect an HDMI cable from the output of the Blu-Ray player to one of the HDMI inputs on the processor. Then using the INPUT SETUP menu of the Rotel make sure that the Rotel processor is set to the appropriate HDMI input and the audio input should be set to “HDMI Audio”. Be sure that the Blu-Ray player has been configured to output the HDMI audio as bitstream and any secondary audio options should be disabled in the player to ensure the HD audio content is streamed to the Rotel processor.