How to check the audio format. - Model SC-HTB01

You can view the audio signal that is currently being recieved by holding down [ VOL - ] (on both the system or the remote control), and [ CLR DIALOG ] (on the remote only) for 4 or more seconds. 

After 5 seconds, the unit will display solid LEDS, view the chart below to understand what these LEDs are indicating.

Indications of LED's
Dolby AudioTM Dolby Atmos® [ CLR DIALOG ] and [ GN-GAME/AV OR-TV ] will be lit
DTS® DTS:X® [ CLR DIALOG ] will be lit
An audio format that is not listed above [ GN-GAME/AV OR-TV ] will be lit