I am trying to revive my uncle's SDA2Bs that suffer from (at least) the blown-tweeter problem. These speakers have great sentimental value: in fact, I drove them home myself in 1990, in a 1986 Honda Civic hatchback. I lost contact with him in the period 2002-2010, but recently he had a stroke :(. Now I am helping him to sell some items, and since I am a DIY audio fanatic, I offered to deal with the complete setup (also includes the high-end NAD pre-amp-tuner-cd from that era). The entire system was ridiculously expensive when purchased in August 1990 (seems like yesterday ...), and oddly enough, hasn't really been used for about 10 years. My uncle doesn't really like music!
Over the years, I believe two sets of replacement tweeters were ordered, but all tweeters he can locate are *dead*. I tested a random spare tweeter and this produced a roughly correct SPL, so I know there is a signal to the tweeters. The inner 6.5 driver is making NO sound, but I suspect this is because I don't have the SDA interconnect.
What should I do? Attempt to locate replacement tweeters, upgrade the crossover (I am comfortable with that), just sell them as-is, what