gofar99 Messages: 1950 Registered: May 2010 Location: Southern Arizona
Illuminati (5th Degree)
Hi Everyone, I've had these around for some time and thought I might be able to put them to use but can't find any hard data on them. I ran the tests to determine the TS numbers and found that they are different. I suspect age has caused the change and one either has a more supple support structure or the other one that is more rigid. Ideas on getting them to match are welcome.
TS data
Speaker A / Speaker B
Fr 28.4 / 41.0
Qms 6.46 / 10.85
Qes 0.40 / 0.87
Qts 0.37 / 0.80
Re 5.8 / 5.8
They are 15 inch co-axials. They came from Lafayette Radio/Electronics sometime in the 60's or 70's. The only number is 21-47254W on the baskets.
LRE had some from several manufactures I believe incl Goodmans, Jenson, Utah. A web search didn't turn up anything in this size and configuration.
gofar99 Messages: 1950 Registered: May 2010 Location: Southern Arizona
Illuminati (5th Degree)
Clearly from Utah as there are similar ones on ebay. Still no clue on what the "factory" parameters were. Nor any ideas on how to get them to match. I have considered that they may need to be broken in after sitting for years. Perhaps just feeding in a signal near the resonance points for a few days at low level. Ideas are always welcome.
Wayne Parham Messages: 18791 Registered: January 2001
Illuminati (33rd Degree)
Yes, I thought I recognized those too, but I'm not familiar with them.
But sadly, I think if the parameters are off like that, you'll probably need a recone. Old speakers sometimes have stretched or sagging suspensions, which can't be "massaged" back to life. I mean, they'll make sound, but they won't be right.
gofar99 Messages: 1950 Registered: May 2010 Location: Southern Arizona
Illuminati (5th Degree)
Hi, yes, but probably not worth the cost. Right now they are buzzing away on an amp and signal generator. I'll see tomorrow if there have been any changes.
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