Thank you for your post and welcome to the Bose Community.
I'd be happy to help with this.
This will depend on the connections available on your TV. It may be necessary that you need a Digital-to-Analog converter in this situation.
The Wave Music System IV has an AUX IN connection on the back. You could possibly use a 3.5mm to 3.5mm into this and out of the TV through the headphones port. Alternatively, you could go from an optical out port and use a converter into the 3.5mm AUX IN.
Examples of a DAC converter can be found here: Digital-to-Analog Converter.
Let me know if you have any questions.
Charlotte G - Community Support