While I have had conversations with Barry, I think I stumbled across that idea from some other white papers (maybe Toole's?, or some other) - Barry's a interesting guy, but also said some things I couldn't rationalize, like set all speaker distance controls at 7 feet regardless of their actual distance to the MLP, then start with your subs at 21 feet, playing with the distance until you get the highest SPL at the crossover...I mean, maybe there's gold there, but haven't tried it yet...
Nonetheless, raising the subs has made all the difference in the world - while I have a large room, there is complete freedom to put the subs wherever I want, so the vertical axis was unchartered territory.
After JL and Audyssey Pro cal, and a slight ELF trim, I noticed the benefit in several areas:
- low volume low end was natural, but more "apparent" than before
- high volume low end was super clean, well integrated, impactful visceral - you will feel yourself and the chair vibrate when appropriate.
- no rumbling
Essentially, before I was considering a third sub to improve the bottom end; now, I am not looking...
Your setup is looking great as always - I wish I had the ability to do more dedicated sound treatments, but the room style and physical configuration, prevent that from happening in any serious way.