Charge coupled crossovers?

[emilime75]

Never heard of this before until this morning. Anyone try this? Any real benefit?

http://www.enjoythemusic.com/diy/0911/charge_coupled_crossovers.htm

[fpitas]

Re: Charge coupled crossovers?

Electrolytic caps tend to have lower distortion when they're DC biased. See figure 2 (linked at the bottom of the page) for examples of the difference that bias makes:

http://web.archive.org/web/200308071...cap.htm#signal

[fdieck]

Re: Charge coupled crossovers?

This method can be used on film caps as well. Arnie Nudell at Infinity used it on some of Reference speakers. Richard Vandersteen also used this in some of his expensive speakers.

http://www.audioheritage.org/vbulletin/showthread.php?3555-Bypassed-and-Biased-Capacitors

https://www.davidsaudio.com/Infinity_Epsilon_WhitePaper.pdf

Another interesting thing about using two caps in series to replace one in this method: The signal voltage is half what wound be across the single capacitor. Signal voltage related distortions would be less due to the smaller AC voltage across the cap even without the bias voltage. I have used this method in digital audio signal interfaces and it was an audible improvement. I believe that the electrostatic attraction keeps the capacitor plates (a very thin metalized film) from moving with signal as much.