[sdiy] Tapped volume pot: extra tone control?

[Loscha]

http://en.wikipedia.org/wiki/Fletcher-Munson_curves
http://en.wikipedia.org/wiki/Equal-loudness_contours

One cap and resistor isn't the whole story, but, it's a start.

> > Does this have the effect of rolling off the high-end a bit as you turn the
> > volume up or vice-versa? Seems a bit weird since the radio has a separate
> > tone control anyway. I guess it's neither here nor there since I need the
> > cap (it looks like a halfway decent film cap) and am not going to be using
> > this circuit in the final amp.
>
> That provides what they called a "loudness contour",  basically giving you
> some treble cut (and therefore boosted bass) at lower volume levels.  Same
> sort of thing as that "loudness" button you'd see on some stereo gear.
>
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