On June 4, 2022 at 10:37, highfigh said...
Maybe for diagnosis at low power levels but those typically have a pretty low power input capacity.
Most volume controls are audio taper, IIRC.
The audio taper controls just add a little confusion for the human who might expect the taper to be linear. 70% rotation is not 70% of rated output -- especially since we don't know the input voltage. (it could be zero if the input is silent) It's still just a voltage divider.
Those little "boxes" are simple voltage dividers. It's easy enough to design your own. There are two issues that can bite. First, calculate the power dissipation of the resistors at the full power speaker terminal output voltage, then keep the values low enough that cable capacitance will not roll off the highs, but high enough that you won't burn up the little box or pill capsule that you are using to house the network.
If you are super worried about high frequency roll off, include a little buffer amplifier with a very short wire to the divider network.
