Your XPA-5 has both balanced and unbalanced connectors on its back panel. The balanced connector uses an XLR connection the unbalanced has an RCA connection. You will need to check the switch on each channel to make sure you select the proper connection type. The slider switch must match the connection type you use or you will NOT get any sound out of that channel. Please read the User's Manual. You can download a copy from the Product Page if you have not yet received your amp.
Maybe my answer was not clear enough. The XPA-5 has balanced inputs, but they are not truly balanced like the XPA-1. So it looks nice and the balanced connection is firmer, otherwise IMO no advantage. The balanced output will sound different because it has a + 3 Db compared to the RCA connection. You can choose: RCA-RCA XLR-RCA