The Sony KDL49WE6xx only has a 3.5mm port for the use of a Audio Out or Digital Audio Out (no seperate/dediated Optical port).
So, you need to get either: 1) a 3.5mm cable (to be connected directly to the 3.5mm input port of your Solo 5 and the TV) or 2) an Optical-to-3.5mm adapter (to be connected to the Optical Cable that came with the Solo 5 and into the TV), as illustrated in page 28-29 of your manual (https
/www.sony.co.uk/electronics/support/res/manuals/4689/46896421M.pdf).
Sample adapters:
https/www.amazon.com/Recoton-Fiber-Optic-Toslink-Adapter/dp/B0002MQGRM
https
/www.bestbuy.com/site/audioquest-toslink-to-3-5mm-mini-optical-adapter-black/6225006.p?skuId=6225006