There is a concern about the voltage coefficient of capacitance causing
audio distortion. See
https://www.edn.com/design/analog/4416466/1/Signal-distortion-from-high-K-c=
eramic-capacitors
and
https://www.edn.com/design/analog/4426318/More-about-understanding-the-dist=
ortion-mechanism-of-high-K-MLCCs
..

Larger package COG capacitors have a lower voltage coefficient than
smaller X7R capacitors resulting in less distortion.

Harold



> Can I use a ceramic 1uF cap to replace a 1uF non-polarised electrolytic i=
n
> the final stage of a woofer driver?
>
> What should a typical ESR range be for a 1uF non-polarised electrolytic?
>
> Details:-
> A Behringer B115W requires replacement 1uF non-polarised caps.
>
> The original electrolytics measured approx 50ohms ESR.  I haven't been
> able
> to find anything definitive regarding ESR values for non-polarised
> electrolytic except to find a reference to them having generally higher
> ESR
> than their polarised counter parts.  However, I have to assume 50ohms ESR
> is really bad.
>
> Trawling the archives I found this from Olin "...There is really no place
> left today for a 1uF electrolytic capacitor..."
>
> In the B115W these caps (c33 and c34 if the attachment made it) are used
> to
> connect the two woofer drive traces to ground.  They appear just before
> the
> final inductor/transformer.
>
> [image: image.png]
>
> What say ye.
>
> Justin
> --
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