Note: Unless the set-top-box has an independent volume control separate from the TV, you will not be able to control the volume level of the headphones. Below are two common connection methods from devices that support this feature are: Some TV's and set-top-boxes do not offer this feature. The availability of this feature is determined by the device the headphones are connecting to.
Having sound emit from BOTH the TV and the headphones at the same time is dependent on how the headphones are connected to the audio source.
