The Fisher XP-7
5-50 watts music power
12" woofer 6 lbs magnet
2- 5.75" inch upper and lower mid-range
2- 3" inch tweeters
*info from Fisher handbook, 1971*
I also found comments on the internet about XP-7 speakers saying the tweeters typically went bad after a few years and have to be "capped." My question is: What does that mean? What is "capping" the tweeters? How does it become necessary? Does this have something to do with capacitors? Should I need to replace the tweeters? They look like new and I think seem to be vibrating?
After I got home in 1973 I happened to find another pair of identical XP-7C's on the clearance shelf at Sears because of minor cabinet damage, so I bought them. The four of them always sounded great together, and they still do, except now after reading the comments about the tweeters I've been listening more critically. Perhaps now I'm only convincing myself the tweeters aren't working like they used to. I do know my ears aren't working like they used to either... but I sure would like to hear any comments you all might have for me.
Here is what they look like:
As for the speakers, with a little more research I think the Fisher speakers they were referring to were the original XP-7. Those had completely different tweeters they called "fried eggs" (because of the orange colored domes, resembling egg yolks) which apparently became hard over time and stopped functioning.
I just finished an article on the Fisher XP-7 and its later models. You really helped me to actually figure out what the differences between the three models were as the drivers didn´t change between the later two models, but the 7c lost a little weight. So thanks for mentioning those plastic grills, I was already desperate about how the 7c could possibly lose weight without any Driver/crossover/whatsoever changes. So again, thanks, those grills made the difference.
You are right about what you said about the tweeters. The original Xp7 has a soft dome tweeter (futuristic at the time and just invented one year earlier (1965/66), whereas the later models have two normal tweeters. You can also read my Review on the Fisher XP-7, 7b and 7C with specs and other infos, if you are still looking for some details.