Dolby Atmos Compatibility Issues on Older Blu-ray Players
While you need at least a pair of height speakers and a new A/V receiver to enjoy the benefits of Dolby Atmos, the theory was that you didn't need to upgrade your Blu-ray player. However, we've found that users of some older model BD players may experience audio dropouts with some TrueHD and Atmos tracks. The issue relates to a feature called Seamless Branching, which was added to Dolby TrueHD after the original spec, (not to mention quite a few Blu-ray players), was released.
Theoretically, Dolby Atmos doesn't require you to upgrade your Blu-ray player. However, users of certain older model BD players may experience audio dropouts with some TrueHD and Atmos tracks.