Can someone please explain to me how an AV receiver with 9 discrete amplifiers and 11.2 processing works? The Marantz SR7012 states that you can configure a 5.2.4 or a 7.2.2. If you add an external amp then you have the option of setting up a 7.2.4. My confusion comes in from a response from a previous post that stated I could not use my Emotiva XPA-3 to power my fronts while using the remaining amps in the receiver to take care of the surrounds and height channels. Thanks in advance for clarifying this for me.