Snell type C iv changing crossover caps

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Snell C iv's don't sound as good esp. the tweeter as I think they should. I've changed all the electronics and still not a great sound. So why not ruin the original x-overs!

Does anyone have a schematic for the x-over? Is there a reason, other than to "fine tune" the x-over to the speakers to have 3 or more caps paralleled? When capacitors drift from stated values, do they usually go up or down in capacity?

Any help here is appreciated, very little about Snell crossover mods on the web.
 

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Bundling of caps was Peter Snell's modus-operandi. It was done, I suspect, for a number of reasons. Utilize available parts, combine low cost NPE's with moderate cost film types, and attain a special, uF value he was targeting for. If you decide to recap, bue sure to add up all of the labeled uF values in a bundle and that will be your target value for the new film cap or combination of caps.
My experience with measuring drifted caps show a general trend towards drifting upward in value. ESR goes up as well.
Sorry, I don't have a schematic. You'll have to remove the xo and figure out each bundle's total uF value. Be sure not to disturb the sliding resistor setting (top center of your pic).
 
Just use 1 or 2 films that get you the target uF value. That way you don't have to worry about future degradation of NPE's.
Carli and Erse yellow caps are mylar and behave somewhat like NPE in their electrical properties. They are an option for you to consider.
Daytons and Erse Pulse-X black caps are polypropylene and have lower ESR and will thus yield a somewhat brighter voicing.
 
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