If I run a 7.1.4 setup with a denon x3600/3700/4700, am I better off running only the LF/RF to external amp and use all 9 amps in the receiver for everything else (including center), or will there be a benefit to sending center channel to external amp as well, thus utilizing only 8 of the 9 internal amps (I know it can’t be shut off, but is there a benefit to not using it)? I have a monolith x7 with at least three extra channels to use. Are there benefits to using less internal amps and more external? I haven’t decided yet which avr I’m buying but likely choosing among the three listed above.