On a journey for the last couple of years

@peterrock Lots of places that sell room treatments have free help. They will guide you on finding the first reflection point. You give your room measurements and they work out a plan with you. It’s not difficult. 

@OP Regarding some early comments about frequency response. Low E on a four string bass is 40Hz. Low B on a 5 string is 30Hz. So unless organs or electronic music is involved, in a real room, extension to the low thirties is plenty. When we are focusing on bass punch in mixing, we're looking at 200Hz 500Hz.

I suspect what you are looking for is more slam. I think your speakers are fine as far as bass punch goes. Slam is more about transient response, plus the capacity to move air. Amplification and cables are certainly worth looking at.  I would add Dan Dagostino to your list - an audition of the SIM Audios or a pair of Progression 550s will tell you what you need to know. If you are looking at an upgrade speaker wise, a pair of Wilson Sashas is worth considering and also possibly also the new JBL Summit series. I've only heard the two way Ama and it's very impressive scale and base extension-wise for a compact two way so the Makalau should be even better.

and btw, for a non audiophile (or hi end audiophile also), you have a killer system. All your components are 4/5 except your sub which is a 2/5

Dunno if the Aragon are to blame…and slam lives ABOVE subwoofer frequencies… I know a Grammy winning artist / engineer who monitors w Aragon and large B and W…but hey…. 

YoYoYaYa

The 550s are out of my range this week ;) but you never know what next week will bring. I think you've described Slam in a way that it resonates with me. BTW I just bought the Nova 5's so a little early to be thinking about changing those. I quite like the Wilsons but unless I go with a stand alone listening room my wife (need I say more). I want my music in the great room kitchen area to enjoy the music where we are most.

As it relates to cables I added Straight Wire Virtuoso XLR from my amp to pre amp and Kimber Kable Heros XLR from cd and phono amp. 

Thank you for your thoughts, Slam is the word of the day

P