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11-24-2018, 10:01 PM
Hi jmcd
1. You have to think of the MV as the signal source with a variable impedance. A 1M pot can look like zero or anything up to a maximum of 250k as an equivalent source impedance. Working against a 22nF cap, 250k allows response to 28Hz. If the resistance drops to 5R, then bass rolls off because the RC time constant is now extremely short. Adding the 100k provides a minimum RC time constant that is quite long and thus bass response remains relatively intact over the sweep of the control.
2. You answered this in post-1.
1. You have to think of the MV as the signal source with a variable impedance. A 1M pot can look like zero or anything up to a maximum of 250k as an equivalent source impedance. Working against a 22nF cap, 250k allows response to 28Hz. If the resistance drops to 5R, then bass rolls off because the RC time constant is now extremely short. Adding the 100k provides a minimum RC time constant that is quite long and thus bass response remains relatively intact over the sweep of the control.
2. You answered this in post-1.
