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That's assuming a lot from what little information there is available. A simple drawing with the values of the caps and coils would make relatively accurate reverse engineering with an online or software based crossover calculator pretty easy, as opposed to haphazardly throwing stuff in based a quick perusal of a photograph. The difference between crossover components for 4 and 8 ohm driver/driver combinations would become plain as a Bulgarian pinup with the smallest amount of diligence.
Someone put in all 8 ohm drivers in the cabinet at one time. Were they using the former drivers for reference or were they settling for the correct physical dimensions from a Radio Shack close-out bin?
Ok... well from the information I have from my own speakers, cactus Bob , and one other member .. all the 4 coil speakers originally came with 4ohm woofers
I don't think I'm haphazardly saying anything that I haven't figured out from my past experiences.
Im not assuming anything, but its quite obvious you are if you think about it!!!
If you have an association of three speakers that have the same type of crossovers, and mine were one owner speakers the others also had four ohm woofers.. well that would lead you to think that they came from the factory with four ohm woofers.
I don't need to decide for the crossover to know if you know a little bit about Zobels, it becomes clear.
All that other stuff is just theory and garbage talk, and has nothing to do with the reality of the situation!!
Anyway...
You can't put an eight ohm woofer in a speaker that originally came with a four ohm unit it doesn't work that way.
Unless you can find some other information out there, I'm sticking with what I know.
As far as the PC goes go with whatever works for you.
Copper traces are thin, they might be wide but they're pretty thin.
I don't think they dissipate heat very well.
In the posters speakers, I don't think I'd worry too much about a circuit board as to getting them up to snuff.
I'm assuming that's what he's looking for.
The guy that put the RadioShack speakers in there probably didn't realize that he had 4 ohm woofers, they aren't to common.
You either have to measure them or deciphered the part number because they're not stamped 4ohm