Dec 5, 2016
Thank you for the post.
You would want to look into getting a Optical to Analog converter to enable this to work with your Bose system. Depending on what the Roku 4 provides for you audio out as for either 5.1 or stereo, you will need to make sure the converter supports converting an Optical 5.1 sound to Analog. Not all converters have that ability.
Let us know if you have any other questions.
Joel - Community Support