What do you use for keeping your (vintage… and why not modern) rubber surrounds in perfect condition?
I just recently took note of this necessity and treated my monitors with vegetable glycerol… What a difference, even though these were brand new 6 years ago…! The bass is more effortless and a bit deeper, this is also heard as the rattling of a few furniture items that were dormant before.
There is scarce info on surround lubrication on the web, I’ve digged up just a few mentions of glycerol and silicone being used.
Are there perhaps even specialty products for this purpose?