That's why I said if you have the Denon AVR-X7200WA, then you can just get a Monolith3, because you assign the internal amps to whatever you want. As far as I know, only the Denon flag ship AVR-X7200WA and AVR-X8500H (moot point because it has enough internal amps anyway) have this features. If you have the lower models, you cannot re-assign the 5 main channel internal amps, so if you connect a monolith to those lower model AVRs or even flag ship Yamaha to the 3 main channel pre-outs, you will not be able to run 7.1.4.
The AVR-X7200WA is really the best deal right now for that reason, as well as the strongest power supply for only 9 channel internal amp, flag ship AKM DAC, pre-amp mode, among others..