I recently got installed videocon d2h HD DVR at my home. Right now I have it connected it to my plasma using HDMI and hence the sound is through TV speakers.
The STB has a SPDIF output for audio as shown below which I want to connect to my logitech Z-5500 HT.
The HT has a coaxial input. So I am assuming both these are compatible ports? If yes what cable should I buy?
And how should I configure my STB to output sound through SPDIF and not through HDMI?
The STB has a SPDIF output for audio as shown below which I want to connect to my logitech Z-5500 HT.

The HT has a coaxial input. So I am assuming both these are compatible ports? If yes what cable should I buy?
And how should I configure my STB to output sound through SPDIF and not through HDMI?