From the Help:
The Y axis used for the impulse response can be selected as % FS or dBFS (FS = Full Scale) via a control in the top left corner which appears when the mouse cursor is inside the graph area.
I did say I wasn't advocating adding anything to REW for this. For >7.1 sound systems with only HDMI input, LPCM isn't sufficient to access all channels/speakers. It would be a small convenience if REW supported sequential measurements with file playback, but if REW doesn't know the file...
Not that I'm advocating anything be added to REW, but I don't understand the decoding bit. REW could continue to take an LPCM sweep file, just like it does now for measurements from files, plus a playlist of files (not limited to Atmos; I have DD/DD+/DTS sweep files, for example), and it would...
I don't know for the Dolby files. For my files, the source files were generated with REW using -12 dBFS, but there's no way to control the Dolby dialnorm for the AWS output, and the dialnorm used is 16.
Dolby provides DD+ Atmos full range pink noise files:
https://download.dolby.com/us/en/test-tones/dolby-test-tones_5_1_2.mp4
https://download.dolby.com/us/en/test-tones/dolby-test-tones_7_1_4.mp4
https://download.dolby.com/us/en/test-tones/dolby-test-tones_9_1_6.mp4
I have in the past produced...
Download
https://www2.iis.fraunhofer.de/AAC/7.1auditionOutLeader%20v2.wav
and play it using Windows Media Player, and see if you correctly hear output from each of the 7.1 speakers.
Edit: Make sure Windows is configured for 7.1, and check what input signal the Denon reports while playing the clip.
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