Audio cable connected from Sony STR-de505 receiver to Spectrum cable box will play surround sound on speakers connected to receiver.
Roku is connected to tv via hdmi cord.
Audio cable connected from receiver to tv will not play surround sound or any sound on receiver when I watch videos on my tv from Roku device. Can you provide me with a solution? Thank you.
Does the TV have analog audio outputs? You may be mistaking inputs for outputs.
If the TV only has digital audio out then you will need a digital to analog converter. Check the TV manual on how to use the digital audio output. If it can't be set for PCM you will need to get a DAC that accepts 5.1 bitstream.