You have the 3.5 mm audio cable plugged in the AUDIO OUT port of the television. Check the audio settings of the TV to enable the loudspeakers to be used in parallel.
Alternatively, use the optical (TOSLINK) cable instead of the analog 3.5 mm audio cable to connect the TV Connector to the audio source.
The Unitron support team is here to help. Learn more about important topics and find resources that will help you with all of your Unitron products.