Really? Only measurements over analogue outputs? Are you sure? A lot of modern receivers don’t have analogue multichannel inputs any more. Also this would mean no way to measure atmos height speakers as 7.1 input doesn’t have four more for atmos height speakers. This can’t be right. It would mean no one can measure the full sixteen channels on a home system. The last two receivers I have owned including current one did convert analogue signals to digital for room correction and eq and delay based on distance. U had to choose the pure direct mode to bypass this.