Hi again! I just got a gift of the Apple 4K TV and I'm not willing to buy a new audio-receiver just yet. I have been using an HDMI AUDIO-EXTRACTOR that is compatible with my Blu Ray player(1080) but I get" NO SIGNAL" hooking up this new TV the same way. I read you need an audio-extractor that is capable of 4K 60HZ/Dolby Vision that connects to my sound system using the old RCA red/white plugs. I see quite a few on AMAZON but am not sure which one I need? Some of them say DOLBY VISION and others just say 4k/60hz. I am currently hooked up from the APPLE to the TV using HDMI 1 that says ARC. I'm stuck with using my 4k TV speakers but want to play it through my Technics-receiver. HELP!!!!