I have the same problem, ie the sound of the tv backround plays at the same time as the Netflix sound which is low as well. I called bestbuy's geek squad to come and take a look, when I gave them the tv model number they said that for some reason Samsung wont allow Netflix to go through ? don't know if that's true, sounds like its a possibility, but thinking of getting a roku 3 and wondering if that will work. I have a Samsung pn64f8500 plasma tv.
good luck!
good luck!