Hello, I would like to assist you with your question today. Please remember to click ACCEPT after you are satisfied so I get credit for my time.
I believe you have your speaker connected to the incorrect port on your tv. You mentioned having it connected to the input, when you need an output port.
Your tv has only a digital (coax) audio out, which is a single digital RCA cable.
Since your zvox system only has analog inputs, the digital audio out on the tv will not work.
You will have to use the headphone output on the tv, to connect to the input on the zvox.
You will need a 3.5mm male to 3.5mm male minijack cable for this. Here is an example: http://www.amazon.com/Cables-Unlimited-AUD-1100-06-6-Feet-Stereo/dp/B000SE6IV8/ref=sr_1_4?ie=UTF8&qid=1318609478&sr=8-4
I will try and see what happens. I was sent a mini jack with the VOX.and willtry that..In other words I just plug the mini jack into the earphone jack on the tv correct.