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RE: Tympani IVa active crossover.

Well, I have two kits of that First Watt/Pass 6-24 crossover, still unused. What I do not like is the electrolytic capacitors on in- and output, at least not on the high frequency section. I recommend replacing the trimpots with resistors when the final crossover points are set. Some audiodesigners like to keep the series resistance below 15 kOhm, to achieve lower noise. That will force you to increase the values of the capacitors in some cases. As this a fully adjustable crossover, there is room for experimentation.

There was an interesting story on the BG RD75 many years ago:

Edits: 01/31/21

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