Hey!
I'm amazed that your 1.5QR still playing! My pair are pretty dead because of the bad glue and the wire is pretty detached from the panel.
I bought my pair used back in 1996 and about 3-4 years in I noticed a buzzing sound. It was one point so I use sticky glue on that. By 2001 I discovered single driver speaker and built a pair in 2002 as an experiment. Well, the 1.5QR never went back in my system. I was going to sell them but never did, I guess because of the wire detaching problem of which gotten worst. So, still have them... strangely enough they make a pretty acoustic panel in the corner of my room, I do like the sound of my system now with them there.
I upgraded the xover with MIT RTX caps and custom made Alpha Core Goertz flat wire inductor. All are exact value as the original. The sound was great. Well, since my 1.5QR are pretty dead, if anyone interested in buying those xover parts let me know.
Anyway, I must say Manepan will always have a soft spot in my heart though even though I went back to box speaker, single driver in my case.
Buddy