Hi, I’m looking forward to your findings. Wish #4 , certainly throws a huge curve ball ! Anyway , I heard a friends system, Westlake BBSM-15’s bi amped with a pair of Bryston 4BSST’s . He picked up an almost dead pair from a studio that had shut down . They were flat black . He refinished the cabinets and had the ( JBL ) drivers rebuilt at Orange County speaker . To me the older big JBL studios sound better than the new stuff. You will need a lot of power and some room treatment too . I saw Supertramp play at a restored theatre in Fresno when they first toured . They played “ Crime of the Century “ just like the album . I’ve been trying to capture that sound ever since! There is a guy named “ Chip “, he is on EBay as “ Rumdog”. He’s an old school JBL fanatic. He runs the 44XX series bi amped . Last year he was selling some Everest . He offered me a pair of JBL L 300’s restored for $5k. I’m at 559 392-5209. Text me for his number . He loves to talk and he is a wealth of knowledge . As far as trying you meet all your criteria, I started like you, and now my JBL’s are in the closet ( not for sale ). But to get it all and have the beautiful audiophile smoothness , Big System and Big Bucks . So on a budget , restored JBL , bi amped with a tube mid/ upper and SS in class A/B or class D. Run an active crossover and use room correction . And please share your results . Thanks , and Happy Listening , Mike B.