A proper 7.1.4 test file will:
Are you looking to test your audio setup's capabilities with Dolby Atmos 7.1.4? Look no further! This feature provides a direct download link to a test file that will help you verify if your system is properly configured to take full advantage of the immersive audio experience offered by Dolby Atmos. dolby atmos 71 4 test download link
Alex refined his search: "Dolby Atmos 7.1.4 channel check object-based audio download archive.org" A proper 7