Ive been hunting for a resolution. I use my Denon for Blu-ray, TV, and cable box w/stereo tower spkrs which can crank. I stream Netflix and Amazon Prime movies but must always use the tv spkrs. When watching tv through cable box or a bluray dvd, Denon works the stereo spkrs great, its just an issue w/streaming through the Samsung Netflix, Amazon. Its a pita to have to grab the remote and switch sound every time, plus itd be great to hear my spkrs in streamed movies. Id never heard of ARC before. I thank you very much for the information and will also try to connect optical cable now. One last thing, this is also a phenomena w/Panasonic TVs so not just LG and Samsung but other top tv, Panasonic. These are the top brands! My pal has same issue when we stream her Netflix over her older A/V receiver. I'll have to inform her of this and order her an optical cable. Thanks again!