Looking at the list so far the first post stands out.
Super Nine ...
' Ease of placement ', ' Enhanced Sweet spot ', ' Bass Output '.
Reference:
https://www.stereophile.com/content/devore-fidelity-gibbon-super-9
Having witnessed an Orangutan / Octave demo I would expect the Devore to handily transfer what you have with the 509x into the space.
The listening space btw is a winner from the Bolt - area reference leaving the listening position to consider as well.
Super Nine ...
' Ease of placement ', ' Enhanced Sweet spot ', ' Bass Output '.
Reference:
https://www.stereophile.com/content/devore-fidelity-gibbon-super-9
Having witnessed an Orangutan / Octave demo I would expect the Devore to handily transfer what you have with the 509x into the space.
The listening space btw is a winner from the Bolt - area reference leaving the listening position to consider as well.