Thanks for the great responses so far, very helpful!
Yes, these new MkIV's are in the same room and location as the previous speakers. Unfortunately, I am very limited where they can be placed, but the location worked very well before. They are only about 6" from the back wall and 2 feet from the side walls. Perhaps I was used to the walls reinforcing the bass so strongly with the 4 rear firing 10" woofers on the Mk1.5. Yes, the bass on the MkIV is tight and tuneful, but just pretty underwhelming so far in comparison (the down firing woofers are definitely functional). Hopefully I can get it dialed in, because it has left me with some buyer's regret, hoping for an upgrade, but feeling let down about the bottom end. For context, I am also a bass guitarist, so I do love some very deep low frequencies!
Spiritofmusic, thank you for your very detailed post, appreciated! I will try some of those settings. I wish I could pull them out from the wall as you suggest, but it's just not practical at all for my space. Coincidentally, I also have a 150 yr old suspended wood floor, so I could play around with footers. I just put on the Black Diamond Racing cones that were on my last set of speakers. Have you found that the gap spacing to the floor is critical? In the manual, it suggests even 1/4" is sufficient, but at least one forum post I read said that bass didn't really begin to bloom until the speakers were 3" off the floor.
As for my amplifiers, I don't think they are "bridged," but not 100% sure. They are Cary 300SE monoblocks, with a Cary SLP98 preamp in front, all run with unbalanced RCAs. One odd thing about the preamp is that it inverts phase, so you have to switch around the speakers cables, but I believe I have that sorted properly.
Other thoughts are welcome!
David
