Wow,
this is all good info, I think I'm going to look for some 044 tweeters after I find the PR300 passive radiators.
Looking at the ebay links I saw a pair of speakers I use to have; when I got married my wife said they were too big and that I should get rid of them. They were L-65 Jubals. I sold them for 250.00 in 1990. To be fair we were living in a mobile home at the time... but still...