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In Reply to: RE: Tympani IVa active crossover. posted by andyr on January 30, 2021 at 20:17:42
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:
http://web.archive.org/web/20080709041133/http://ldsg.snippets.org/ALSR/dbsindex.html
Edits: 01/31/21Follow Ups:
Get busy and build one @Roger Gustavsson so you can clue me in. LOLDo you prefer another type of capacitor to electrolytic or no capacitor at all?
Are you going to use 2SK170 or LSK170 JFET's instead of J113's? (The parts list says J114 but Nelson's notes say J113.)
I ordered a kit.
Edits: 01/31/21
Electrolytics in series with the signal is not what I want, at least not if it to tranfer high frequency signals. I think they cannot be dismissed as the power supply is single ended. It is possible to use film capacitors, maybe like Wima MKS 02 (0.68µF, if that is enough) at the inputs and with some tricks Wima MKS 2 (10µF) at the outputs? My boards came with J113 and bias resistors selected for them, I will not use 2SK170 or LSK170. Well, I have not even decided to use this crossover yet.
Somewhere along the way most recorded music has probably passed through some electrolytic coupling capacitors. :) In fact, probably quite a few. :)Dave.
Edits: 02/03/21
I know that! Still, it is good pratice to avoid them directly in the signal path if you can.
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