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In Reply to: RE: Shunt Pot Volume Control - Better Sound posted by Johno on March 5, 2015 at 16:04:10:
"An increase in source impedance due to the series resistor when the control is turned past approx the 3/4 -8dB position. (This would only be a consideration if the control needed to be used at this level or higher.)"
I ran some numbers. At an attenuation of -12dB the output resistance of this attenuator is 22.6K. It doesn't drop below 5K until the attenuation reaches -26dB. Drops below 2.5K at an attenuation of -31.5dB. These are the source impedances that following gain stage will see. There are situations that won't tolerate high source impedances well and care should be exercised when implementing a shunt vol. control with 91K series resistance.
FWIW, in my experience adding a high series resistance in the signal path is like throwing a wet blanket on the dynamics of the music being reproduced and I try to avoid doing that if possible.
"It is better to remain silent and thought a fool, then speak and remove all doubt." A. Lincoln
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- RE: Shunt Pot Volume Control - Better Sound - JKT 03/6/1512:40:33 03/6/15 (0)
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