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RE: Shunt Pot Volume Control - Better Sound

I've been using shunt style attenuators for years. A couple of comments. This arrangement also works well for balanced inputs. You just need two series resistors, one for each balanced line. It is also a good practice to match them so you don't end up converting some common mode noise to differential mode noise. Second, a 100K pot with a 91K series resistor is high for a shunt attenuator. This will present a high impedance load to the following stage. Best to check it's input capacitance. More usual values are 10K for the pot and 5K for the series resistor. Of course the situation is now reversed and the attenuator could load the output of the previous stage so it needs to be low impedance. As they say in Storybrook, all magic comes with a price. Also, The math for a shunt attenuator is not logarithmic and most of the attenuation will occur in the first 60% of rotation. A great solution is a custom stepped attenuator with the right values. It will sound better than any pot. I was skeptical myself until I replaced my Alps pot with a custom made attenuator. Cheers!


"It is better to remain silent and thought a fool, then speak and remove all doubt." A. Lincoln

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