I have an older Philips surround sound system which only accepts a stereo input through 2 jacks or digital coax input.
I bought an optical to digital coax converter a while back as my TV only outputs 5.1 via HDMI or optical.
If I watch a channel or use a device that has Bitstream DTS/5.1 then the converter works fine and sends the signal to the receiver and I get perfect sound.
If I watch a channel or use a device that outputs in stereo/linear pcm then there is a constant white noise in the background through the speakers.
I've taken a look at the setup options on the receiver and it's set to receive ;all' types of signal. I've tried the other 2 settings 'off' and 'PCM' but had the same result.
I currently have my TV set to output the sound via optical --> 'auto' and if there is a 5.1 signal available there are no issues. However, I have noticed that if I change it to optical-->' pcm only' then the issue with the white noise happens.
I'm not too familiar with these things so I'm not sure if its the converter box, the coax cable or the receiver being too old.
Any advice would be hugely appreciated.