Vivitek RP56HD21-A - Manual (Page 30)

Connecting an External Receiver or Amplifier
You can connect an external receiver or amplifier to your Micro Chip Display
Projection TV.
To connect your external receiver or amplifier :
1 Connect the red (R) and white (L) audio jacks on the back of your external
amplifier or receiver to the AUDIO OUT jacks on the back of your RPTV.
2 Set the REAR AUDIO OUTPUT in the OSD to VARIABLE if you want to use the
volume controls on your RPTV, or FIXED if you want to use the volume controls
on your amplifier or receiver. For information about the OSD, see“Using the OSD”
on page 31.