Hi, I'm Nathan.Sorry to hear that you're having trouble, but I'll do my best to help you. Please give me a few moments to review your details here.
Is this a wired headset, or is it a wireless system with a transmitter/base?
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That is correct, you have to use the optical port, but toslink to coax is not likely to work unless your transmitter actually has coax, and there are some additional configuration steps necessary as well for it to work.
That item looks like a digital to analog. If your transmitter has an actual digital coax, you need a different converter: http://amzn.to/2iFx7tU
You'll also need to go into the tv setup menu and change the audio output format to pcm/stereo too.
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