When I was in the Marine Corps back in the 70's, I bought a set of 4311B's and had them shipped home immediately without even opening the cartons. Fast forward 50 years and I still have and use them without ever having to replace so much as the grills. They still sound as good as the day I bought them. I think it’s time to repay these faithful and dependable warriors with an update both cosmetically and electronically. My counterparts say to clean them up, put some Poly on them and plug them back in.
The general consensus is 50/50 on updating them with new Caps, HF Control rheostats (front lower panel X2s) basically replace the crossover with new components’. My issue is that they sound great and everything on the speakers works. So here’s my dilemma/question: If they were your speakers (50 years old) and decided to do what I plan on doing what would be needed to bring these workhorses into the 20th Century. My music tastes range from Blues – lots of Blues to Stevie Ray Vaughn, 60’s & 70’s …. I don’t beat the hell out of them volume wise and listen to them 3-4 days a week.
What would you do in terms of component replacement without changing the sound characteristics which was the reason I bought them in the first place.
An suggestions would be greatly appreciated!
PS: What is the Blue material on the speaker mounting board on some JBL Models?