My personal opinion is that this problem is due to poor quality contact cement, which I believe has already been mentioned. And because only a small number of speakers suffer from this problem it was probably a specific glue used during a specific time period. This is the probable culprit since so many speakers remain in perfect condition after so many years.
BTW: My SC-IVAs suffer from this same veneer separation problem although around the edges rather than the centers of the panels.
If I ever hear a solution that makes sense I'll give it a shot.
BTW: My SC-IVAs suffer from this same veneer separation problem although around the edges rather than the centers of the panels.
If I ever hear a solution that makes sense I'll give it a shot.