Onkyo TX-NR545 Manual page 57

Pure Audio (European, Australian and Asian models)
Direct
Stereo
DSD ＊1 ＊2
Dolby Surround
Neo:6 Music ＊3
Orchestra ＊4
Unplugged ＊4
Studio­Mix ＊4
AllCh Stereo ＊5
Full Mono ＊5
＊1 Cannot be selected when the input format is monaural or 2 ch.
＊2 Center speaker or surround speakers need to be installed.
＊3 Can only be selected when the input format is 2 ch and a center
speaker or surround speakers are installed.
＊4 Surround speakers or height speakers need to be installed.
＊5 Center speaker, surround speakers or height speakers need to be
installed.
Dolby Atmos
The listening mode of Dolby Digital Plus or Dolby TrueHD can be
selected if back speakers or height speakers are not connected.
Pure Audio (European, Australian and Asian models)
Direct
Stereo
Dolby Atmos
Orchestra
Unplugged
Studio­Mix
AllCh Stereo
Full Mono
Dolby D
Pure Audio (European, Australian and Asian models)
Direct
Stereo
Dolby D ＊1 ＊2
Dolby Surround
Neo:6 Music ＊3
Orchestra ＊4