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 Post subject: paisley 3 way xover???
PostPosted: Thu Oct 19, 2017 6:22 am 
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somebody ask me to check is paisley speaker, wanted to change the woofer. but it was just a dust cap that came unglued. but I was intrigue by their xover. it is 3 ways , but in the mid range section. paisley used some very intriguing concept and values of capacitors. they used 2 x 47 uf 100 volt to cut frequency. but after they added 3 x 2200 uf 25 volt and one 1000 uf 25 volt POLARIZED capacitors.
never seen any xover using polarized capacitors. and even less commun their value of 2200 uf ???
anybody came across something like this?


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PostPosted: Thu Oct 19, 2017 6:33 am 
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If one uses a large enough capacitor they can capacitor couple the woofer itself. This allows for shifting the q of the system down, for a change in the bass response.

It was done in some speakers, in the 70's and up into the early 80's, but really died off as bass reflex took over.

I still think bass reflex is bad news all around (just an excuse for ignoring the bass range, etc), but hey....

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PostPosted: Thu Oct 19, 2017 7:49 am 
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ok ,but all of them is on the mid range circuit. would this affect the woofer response?


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PostPosted: Thu Oct 19, 2017 7:56 am 
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zon001 wrote:
ok ,but all of them is on the mid range circuit. would this affect the woofer response?


It would affect the interactions, but it would also phase shift the full mid range, down into the upper bass ranges.

This might make for a very snappy response characteristic, as most times, the bass and the mids are out of phase through the crossover range.

Three way crossovers are much more difficult to design than two way crossovers. Ian is no dummy.

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PostPosted: Thu Oct 19, 2017 8:14 am 
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Polarized caps can be used but they have to be in series, connected back-to-back so the same poles are connected. This reduces the overall value by half, assuming both caps are of equal value.

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