(...) Most speaker crossovers (whether 1st, 2nd, 3rd, or 4th order) utilize electrolytic capacitors in their design. And the values needed are simply too large to use the more desirable film capacitors (i.e., polypropylene). When I designed crossovers in my younger days, I always used the best electrolytics available (Black Gate), but always wondered if it would be possible to use polyprops. I’m sure many others thought about this as well. The general answer is that constructing a crossover with polyprops would be essentially unrealistic as the number of caps need to approximate the values of a large electrolytic, would just not be feasible.(...)
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