Sorry for the big delay in replying.
I have been tweaking the mul****ude of crossover points in the system for quite some time actually. My setup is a litte more basic, I'm running my PT's full range with no subwoofer, and directing the LFE to the front LR as well and it sounds awesome.
When you say powerful sound, do you mean that you seem to be lacking some low midrange? Or do you mean just pure SPL?
Also, what type of amplifier are you using to drive the Aperions?
I have noticed that the Anthem is <prepare for subjective description> more 'clinical' than other products I have used. By clinical I mean sterile, no life so-to-speak. But, each input can be selected to bypass the Anthem and go direct, or, use the Anthem DSP and tweak bass/treble etc etc to give you certain amount of customization to your sources. Also, you can have 2 totally seperate setups for stereo and multichannel sources, and I mean seperate down to using a subwoofer or not, crossover points and input level adjustments. You can assign these modes on a per input basis to automatically reconfigure upon selecting that source.
I would play with the settings and certainly read the manual for the AVM, it's a very sophisticated unit and if you only spent 30 minutes, you haven't really scratched the surface.