I also like the Snell's you have; I can remember hearing them on occasion at several dealers and they are very likable. My opinion is to find a dealer or authorized repair center that will refoam those particular drivers. Yeah you could 'wing' it yourself but I wouldn't...
Vintage Snell Ci Loudspeakers, Replace or Rebuild
I own and am quite fond of vintage Snell type Ci loudspeakers. Because of age I have just found base drivers are suffering from severe foam rot. Called Snell Acoustics and was told replacement drivers are available at $176 a piece. Also was told by customer rep these drivers are not original equipment and surrounds are made of rubber not foam. Although the customer rep did not eliminate the idea of having drivers refoamed or reconditioned, it seems like he was trying to sell me the new pair. They do not offer repairs on these vintage products nor do they offer any recommendations. Am very leary of what to do. Concerned about changing original sound with new drivers and where and whom would I find a reputable dealer that could recondition these drivers to the original specifications? Thank You