Yes, delay is possible with this setup. Here's why:
AUX Connection: The JBL PartyBox connected via AUX may experience slight audio delay because analog connections like AUX can introduce latency, especially when paired with digital devices.
HDMI Connection: The soundbar connected via HDMI should generally have minimal delay, but if your Android TV is processing audio and video separately, it could cause a sync issue.
Audio Processing: Both the soundbar and the JBL PartyBox might have their own audio processing, which can add latency when used together.
To minimize delay:
Check if your Android TV has an audio delay or lip-sync adjustment setting.
Use a single audio output (either AUX or HDMI) to simplify the setup.
If possible, connect both devices via Bluetooth or a single digital connection to reduce latency.