A:AnswerHello Receiver,
Looking at the STR-DE445 Receiver it supports the optical /coaxial (digital connection) and analog (Red/White) connections in which the DXC390 also supports. The best connection to use is one of the digital connections. Once you have the connection, then you would have to go into the receiver portion to see if there is assignments required for the digital connection being used.
Thank you
Onkyo
