Al - Again, great information, so thank you.
1) No, not balanced.
2) No, not bridged.
3) No, single-ended.
4) No, 300B SET.
Wow, four out of four!
Whart - Thank you, it sounds like you're having success with careful tweaking. Yes, the driver is a modified Lowther DX65.
1) This back wall that you see only has the one useable corner, so you're only seeing one half of the room. The other corner is 31' from the corner you see.
2) It would be great to know what jumpers you liked best.
3) Interesting, I'll look into those. And, an indication that design may not play such an important role.
4) That's very reassuring.
You got me there, because Jeff is my dealer. And, the best one I've ever had the fortune of meeting. He doesn't sell a subwoofer line, but he has spent a lot of time, setting up his Cessaro subs.
bondmanp - I think you may have misunderstood, because I don't have corners. If I did, I probably would not want subs.