Some line-outs transfer SPDIF also. I think that's what people are talking about. My Meridian Explorer has such a socket. I am thinking of testing the Mojo with the SPDIF signal from my ME. I want to make sure it's not a Mojo that hisses on optical or coaxial whichever it is. Very confusing. I am not sure but I think people are saying a standard 3.5mm to 3.5mm jack cable will do it. I have one of those so I could be set up to try it. I think I am wrong here but I hope someone will clear it up. To confuse matters more there is coaxial SPDIF and optical SPDIF.