My LCD TV has downfiring speakers and the sound is audible everywhere except in front where people sit to watch. I was looking for a substitute. But set-top box has RCA connector and I have desktop speakers with 3.5 mm jack. This type of converter is not available in local shops. While searching I found this here and for 167/- it's a good purchase. The connectors have gold or brass plating. Sound from F&D speaker bar is excellent and stereo. There is no distortion. I am using a SD set-top box what more I can expect. I am happy with it and for TV viewing purpose it's a great product.
If you have no music system output option on your TV, you can buy this. I have Sony Bravia BX300 32 inch TV. It works well with my GTPL set top box for producing output. You can directly connect it from set top box to Music system/speakers.
I bought two of these, one to connect my pc with an old home theatre setup, and the other to connect my digital piano to the system. One was having channel issues in the beginning few days where left side was often getting cut off. But after few days, it was all fine.