I was recently given a pair of Boston Acoustics A70 speakers because they were thought to be broken beyond repair. Boston A70 speakers are very good and have a strong following among the vintage HiFi crowd. From the outside, the speakers appear to be in very good condition. After taking the grille panel off it was obvious the story was different.
With the grille removed we see that the surround foams have deteriorated and are breaking up. This is not a significant problem, but they do cause the speaker to sound terrible. If this is the only problem, the repair is simple.
In the next few posts I will show what I did to repair these speakers.