Sony STR-ZA3000ES User Manual page 171

7.1-channel speaker placement
Place the surround back speakers as shown in the illustration below. The angles shown by
should be the same.
Hint
As the subwoofer does not emit highly directional signals, you can place it wherever you
want.
5.1 -channel speaker system and zone 2
If you make a 5.1ch connection in the main zone, you can also enjoy the sound in another
location ("Zone 2") by connecting additional zone 2 speakers.