I’m using Chromecast via HDMI, audio connected via 3.5 mm jack to an external speaker (JBL Charge4).
Everything is going fine (audio in sync)… until there is a quite (no sound) moment in e.g. a movie. When the audio in the movie returns (e.g. someone start talking again), it takes a couple of seconds to enable audio again in the speaker. It looks like the PPM stops sending audio to the speaker when there is no movie sound, however enabling sound again takes a couple of seconds. This is pretty annoying, losing sound couple of times during a movie.
Hard to explain, let me know if I need to explain further.