What kind of Audio format can I get when use Orbit?

The Orbit supports 5.1CH Surround Sound. If you use the Passthrough function, it will pass the signal from the audio source to your external speakers in its original format: either Dolby or DTS. In this way, you can get 5.1CH Surround Sound to your external speakers through the Orbit.

However, the bluetooth transmitter can only handle Dolby, not Dolby Plus. It will automatically change the audio format to 2.0, and then transfer it to your Bluetooth headphones. That's why you cannot get 5.1CH Surround Sound to your Bluetooth headphones with the Orbit.