When I hooked up the TV and radio in my previous RV I hooked up the out jack on the back of the TV to the AUX jack on the front of the radio then when I wanted amplified TV I just switched the radio input to AUX and turned up the volume on the TV as desired, and that output in turn would be amplified by the radio amp. Did not have to mute the TV. That way I had use of the remote to vary the volume and mute the sound when needed.