83 replies to this topic

[speaker dave]

Basically, your whole approach to speaker design is to set up some straw-man defects and then come up with solutions to a problem that does not matter.

Howard Ferstler

Hmmm, like nonflat power response and imperfect dispersion?

David

[kkantor]

I think anyone interested in the science behind these
old designs would agree with you Roy. There is very
little info about the parameters of these drivers when
new and therefore any research done today just adds
to the body of knowledge. Thanks to you for loaning
them, and to Ken for testing them.

If anyone knows the original design Fs, Qt, etc. for
these drivers it would be helpful.

Thanks, Pete.

Are you talking about the tweeters, or the MR and HR drivers?

At one point, I did comprehensive testing on 6 different AR 12" woofers... old, new and re-coned, using Tymphany's facilities. Responses, parameters, Klippel data suites, the works. CSP's Bret Theil and Tom Tyson were instrumental in getting there samples. Responses, parameters, Klippel data suites, the works. All the of the data, and a summary of it were posted on a long-gone website of mine, and might be in a library here. I'm sure my site's contents are archived on some tape backup, but finding that would be daunting. (Finding anything older than about 20 minutes is daunting these days...)

In terms of the upper drivers, I did some very rough SPICE models to try and capture just enough info to understand the crossover during the 3a restoration effort. These I can probably actually find!

-k

[Pete B]

Thanks, Pete.

Are you talking about the tweeters, or the MR and HR drivers?

At one point, I did comprehensive testing on 6 different AR 12" woofers... old, new and re-coned, using Tymphany's facilities. Responses, parameters, Klippel data suites, the works. CSP's Bret Theil and Tom Tyson were instrumental in getting there samples. Responses, parameters, Klippel data suites, the works. All the of the data, and a summary of it were posted on a long-gone website of mine, and might be in a library here. I'm sure my site's contents are archived on some tape backup, but finding that would be daunting. (Finding anything older than about 20 minutes is daunting these days...)

In terms of the upper drivers, I did some very rough SPICE models to try and capture just enough info to understand the crossover during the 3a restoration effort. These I can probably actually find!

-k

I do remember the woofer data and I think I have it around here somewhere.
Those were ceramic magnet versions I think, and I also have a pair of woofers
from AR-11s here that I measured - so I think we have a good start for those.

I was more interested in the MR and HR drivers. Please don't fuss to find
anything.

Thanks again!

[kkantor]

I do remember the woofer data and I think I have it around here somewhere.
Those were ceramic magnet versions I think, and I also have a pair of woofers
from AR-11s here that I measured - so I think we have a good start for those.

I was more interested in the MR and HR drivers. Please don't fuss to find
anything.

Thanks again!

Pete,

Here is a link to some 12" data that was very easy to find:

http://admin.officed.../12woofevodata/

Password is: ar12data

I think the summary spreadsheets in the root directory are the most comprehensible. I'll add the data on the other drivers as it turns up.

-k