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. The availability of this feature is determined by the device the headphones are connecting to. Some TV's and set-top-boxes do not offer this feature. Below are two common connection methods from devices that support this feature are:
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.
NOTE: If you have a dedicated headphone jack and use that connection, it will automatically disable sound from the TV speakers.
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