Vivitek RP56HD21-A - Manual (Page 29)

Connecting External Amplified Speakers
You can connect your Micro Chip Display Projection TV to a set of external
amplified speakers using the AUDIO OUT jacks located on the back of your RPTV.
To connect your external amplified speakers :
1 Connect the red (R) and white (L) audio jacks on the back of your speakers to the
AUDIO OUT jacks on the back of your RPTV.
2 Set the REAR AUDIO OUTPUT in the OSD to VARIABLE. For information about
the OSD, see “Using the OSD” on page 31.