[sdiy] Hand-matching capacitors for filter stages

[John Mahoney]

At 04:17 PM 2/9/2010, David G. Dixon wrote:
> > Well then, this is directly my question, what does better imply?
>
>Precisely!  I can't see how one cap or another of similar capacitance would
>make a filter sound "better" or "worse" than another one.  ...

Perhaps some caps have frequency-related non-linearities? Like, maybe 
type X is has fairly uniform capacitance across the audio bandwidth 
whereas the capacitance of type Y gets lower at higher frequencies. 
Seems like a long shot, since 20 kHz isn't a very high frequency, but 
small differences can add up.

Just a sug-guess-tion.

John