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May 28th, 2016, 09:19 AM
#18
Senior Hostboard Member
Re: Crossover Help Needed With ANOTHER Pair of ALTECS
Well--five and a half years later, I've decided I want to experiment with my Model 14 crossovers. When I did this recap in January of 2011, I wanted to replace the 30 year old caps with new caps of the exact same values as I did for both pair of my Model 19's and other Altecs I've recapped in the past. However, in the case of Model 14's, Altec manufactured three variations of the Model 14 crossovers--so if they rethought their design, I'm thinking that maybe I should try one of the other factory designs to see if I like it better than the one I'm now using. My 14's came with the 2 uF and 10 uF combination. If I'm reading Richard C's diagrams correctly, it looks like there was a factory version that used a 2 uF and 6 uF combination. I have three questions before I start my "experiment".
1) Are the two Altec factory designed networks identical other than the 2 uF / 10 uF combination being swapped for a 2 uF / 6 uF combination? In other words, if I swap out 10 uF cap for a 6 uF cap, will that convert my crossover to the other Model 14 variation that Altec manufactured, or are other changes involved as well?
2) I do have to turn down the midrange EQ "pot" on my Model 14 crossovers quite a bit to get them to sound their best. If I swap out the 10 uF cap for a 6 uF cap, will that result in less midrange from the Model 14 system (which would mean, among other things, that I won't have to turn the midrange pot on the crossover down as far)?
3) Does anyone know what the third variation of the Model 14 crossover was comprised of? Richard posted a photo of all three stock Model 14 crossovers, but only did a diagram for two of them?
To assist in the answering of these three questions, here's a photo of the three stock crossovers from Richard's photobucket page. Model 14 x-overs.jpg
Here's a link to Richard's photobucket page which has the above photo plus a bunch of crossover "schematics".
http://feed266.photobucket.com/album...io/account.rss
I'd really like to try at least one of the stock Model 14 designs that Altec manufactured and compare it to the stock version that mine came with to see which I prefer....

Originally Posted by
Earl K
I had saved some of Richard C's original network studies onto an older computer .
Here they are ( with the Model 15s schematic thrown in as a bonus ) .
(A) First, 2 flavours of the M14s original network minus the protection circuitry.
(B) Then Richards' redesigned network .
(C) Then the Model 15 stock network .
<> EarlK
Last edited by voice of the theater; May 28th, 2016 at 09:24 AM.
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