SACD is analog.You need 6 cables going from the DVD player to the Yamaha for 5.1 surround.Coax is for DD,DTS.JD
SACD setup help
I just purchased a Sony 900 DVD/SACD player. I hooked it up with a COAX going into my Yamaha RX/V1 and two stereo cables going into my ARC Ref two. I have no trouble with SACDs in the two channel mode, but I get no input into the Yamaha in the multi-channel mode. It doesn't matter if I set the muti/two channel mode on the Sony to either. What makes this more perplexing is that the Sony has no problem with multi-channel movies with this configuration.