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Join Date: Mar 2002
Location: Greensboro, North Carolina
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It is my understanding that a crossover is designed using the specific drivers in a speaker enclosure to put the crossover points where they will work best. The values depend upon the drivers characteristics. (resistance, inductance, frequency range, etc)
It also is typically designed so the the output level of the different drivers is matched based on their relative efficiency. (so the woofers play at the same volume as the midrange and tweeters)
If the universal crossover has the crossover points at those that match your drivers, and if your drivers are matched in efficiency, then it might work for you.
Since there are programs that model crossovers, If Radio Shack provides a schematic, I would model it with my specific drivers and see if it would be suitable.
I can tell you one thing. It will probably be better than running the woofer full range and using a single non-polarized electrolytic capacitor as the "crossover" for the tweeter that I've seen used in most of the less expensive speakers I've taken apart in my youth. But, unless very very lucky, it will not be as good as a crossover designed for your specific drivers.