By default, when connecting an AUX cable to your TV audio output, the TV speakers will automatically mute.
However, in some TVs it is possible to disable this function.
Please check your TV manual in the audio section.
Also you can use external speakers.
To do so, you will need a 3.5mm splitter, and two aux cables.
Connect the 3.5mm splitter to your TV audio output.
Connect one AUX cable between the 3.5mm splitter and the Strap audio input.
Connect the second AUX cable between the 3.5mm splitter and the audio input of the speaker/amplifier.
*Note: please remember to always set your audio source to MAX volume.