i have a Marantz receiver sr5008 and a Sony xbr55-850b and the new Apple 4K tv. The Apple is plugged into the receiver via HDMI with new cable to support the 4K. From there it goes to the tv. The only 4K setting that works is 4K sdr at 30hz. If I bybass the receiver and go straight to the tv I get 4K sdr at 60hz. What am I missing? I’d hate to go straight to the tv and then use the ARC back to the receiver as I think I’m going to lose Audi quality. Any help would be great.