You have your test file. Now, plug in the USB drive or network share. Here is how to read the results:
Surround sound test files in (almost) every format : r/Soundbars
: Ensure the sound intended for the "Surround Right" speaker isn't coming out of the "Front Left". dolby digital plus test file
Ensure your "Rear Left" speaker is actually playing audio intended for the rear left.
Silence. No sound at all.
Website: demolandia.net (or archive.org) For years, Dolby distributed demo discs to retailers (like the "Dolby Blu-ray Demo Disc"). These have been ripped and shared for home use. Look for discs labeled "Dolby Atmos Demo Disc" (Sep 2015, Dec 2016, etc.).
But how do you know if your system is actually playing Dolby Digital Plus? How can you test the limits of your soundbar, AV receiver (AVR), or TV without subscribing to five different streaming services? You have your test file
Your AV receiver or soundbar will have a display. Play the file via a media player connected to your TV via HDMI (ARC/eARC).
If the narrator says "Subwoofer" and you hear a deep rumble from the box on the floor—congratulations. Your Dolby Digital Plus chain is working perfectly. Ensure your "Rear Left" speaker is actually playing