Hi Vince:Sorry for the confusion, there are two source inputs, one is two RCA Female stereo right and left inputs connections, or there is a 3.5mm stereo input for connecting with an aux cable directly from a Headphone jack on a Smartphone or Tablet. And on the new iPhones with an adaptor. So the 3.5mm input combines left and right channel input. So you are technically correct that there is only one set of RCA stereo inputs. Now unlike our XMP series and AMP200/300 which feature Dual Source Automatic switching you can only hoo up one input connection or the other not both at the same time. Both are analog connections and work equally, as well.TL/5666