Most stereo TVs have special connections designed to connect the TV to a separate stereo system.
These outputs can be either fixed or variable. Fixed audio outputs will not alter the sound from the TV before sending this sound to the stereo system. The user would adjust the tone, such as bass and treble, and the volume using the controls on the stereo system. Variable audio outputs allows the tone controls and volume controls built into the TV to make the adjustments before sending the sound to the stereo system. Allows the use of the TV remote control to adjust the tone and volume of the TV sound when listening through the stereo system.