I have just purchased a new TV and need to connect it to my aged Surround sound system. Yamaha RX-N600D. I would like to use the ARC HDMI connection form the TV but no HDMI option on the Receiver, although it has SPDIF. I have seen lots of ARC-SPDIF boxes on sale but are they any good? Has anyone had a good experience with this option.?If so I would be keen to know the setup. Regards Fred.