I just got a soundbar IHT 6000 and hooked it all up with the 3 wires.
The bar turns on for a second or two and then just stops outputting sound. While the sound is on, it sounds good and can be muted and turned up or down, but once it stops, the only way to get it back is to turn off the power and turn it back on and then it does it again. The source light is lit blue and blinks after it cuts out.
I have tried the audio cable in both my toshiba tv and my tivo box and it does the same thing with both.