I have been trying to play sound from my samsumg smart TV series 7 to my outside external speakers via my marantz amplifier but without any success. I purchased a digital audio converter to analogue as my ampli is an old version. I first connected the optical cable to my TV in the digital audio output connection then into the converter connection. I then connected the red and white cable into the converter and then into the AUX connection of my ampli. I connected the audio converter for power then change the sound setting on my TV to external speakers. When trying to listnen for the sound all I hear is a rattling sound. I have followed the exact instructions but without any success. Can someone out there assist please. Many thanks. Christian