Amcore, thanks for responding. The coil was CUT at one point, and I had no sound coming out of it. I was playing with volume @11:00 (uneccessarily load, for my room, I might add) and the music was Mahler's 5th symphony.
By the way, I have never tightened the drivers -- that's great idea!
How did you realign the tweater? When I opened up the spare to add a new ribbon, there was seemingly only one way the ribbon could fit so that the connectors face in the right direction. I changed the round paper coming in between the magnet chasssis & the coil, using soft coffee filter paper -- but have not tried the driver since.
By the way, re: tuning. I have noticed that in my system, the midrange & upper mid sound a tad better / clearer when the control is set @ 1 than when set @ 2. This may be due to my amplification -- european gear does tend to emphasize mid-range -- but I think it's worth a try... However, I wouldn't change the sub's settings, as per Amcore's suggestions, to suit the midrange control.
I am now @ PH45, Low 86, Vol 36, and feel I'm close. I think Chesky's Listening Tests CD can also be of use here...