Onkyo HT-R391 Instruction Manual page 13

Speaker Configuration
The following table indicates the channels you should use
depending on the number of speakers that you have.
No matter how many speakers you use, a passive
subwoofer is recommended for a really powerful and solid
bass.
To get the best from your surround sound system, you need
to set the speaker settings manually (➔ page
Number of speakers 2
✔
Front speakers
Center speaker
Surround speakers
Connecting the Speaker Cables
The speaker terminals are color-coded for identification
purpose.
Speaker
Front left
Front right
Center
40).
Surround left
3 4 5
Surround right
✔ ✔ ✔
Subwoofer
✔ ✔
✔ ✔
Color
White
Red
Green
Blue
Gray
Purple
En-13
Connections