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Recommend crossover capacitors, values?
I want to recap the crossovers in an old pair of high-end speakers I
own. I've opened up the cabinet and diagramed the circuit, but have a few questions about what I found. Perhaps somebody can help. The first thing I noticed is that many of the "better" caps (polystyrene in this case) are run in parallel with electrolytics to reach the desired value. I spoke with a tech who said that this was done to achieve the filter affect of the combined capacitance while taking advantage of the better signal path through the one quality capacitor in the circuit. Does this make sense? I certainly understand that there is a cost advantage of doing it this way because the circuit uses some very high capacitance values. Replacing these caps with modern, high-end versions would be cost-prohibitive, if not impossible. I just want to compromise as little quality as possible. That leads me to the next question: how do I achieve the desired values and maintain the quality without going broke? The midrange signal is fed through a set of capacitors with a combined value of 75 mfd. That's much higher than I've seen for sale from any high-end capacitor manufacturers, and anything close is prohibitively expensive. The next issue is with matching. I don't own a capacitance meter, so matching the pairs myself is not an option. Is it worth buying matched pairs of replacement caps? And what do I do if I need to add electrolytics into the circuit to achieve the desired value? Can I buy those matched as well? Lastly, what are the preferred brands of capacitors to use? Are there any good web sites that do comparisons, including listening tests? Thanks very much in advance. -- Steve Cohn |
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