@cleeds
Nothing is completely passive. We may think of C in terms of uF, but there are L&R factors which pertain. Pull apart a switch and examine the contacts. One set may have a contaminants/wear/geometry that the other does not.
A great recording & electronic design engineer built an incredible sounding recording console that used mercury wetted relays as close to the active circuitry as possible to eliminate passive colorations from running traces [audible] to surface switches [audible] and back.
Mic pre's, EQ, recording consoles in the studio.
In the early 80's. Then state of the art LA recording studio. Participants were well regarded engineers and IIRC, some industry sales reps. Source was hot-rodded ATR-102 ½" master tape feeding Bryston amp stack and time aligned studio monitors. Test was change or no change. Blind. Most got most of the changes.
Nothing is completely passive. We may think of C in terms of uF, but there are L&R factors which pertain. Pull apart a switch and examine the contacts. One set may have a contaminants/wear/geometry that the other does not.
A great recording & electronic design engineer built an incredible sounding recording console that used mercury wetted relays as close to the active circuitry as possible to eliminate passive colorations from running traces [audible] to surface switches [audible] and back.
Mic pre's, EQ, recording consoles in the studio.
In the early 80's. Then state of the art LA recording studio. Participants were well regarded engineers and IIRC, some industry sales reps. Source was hot-rodded ATR-102 ½" master tape feeding Bryston amp stack and time aligned studio monitors. Test was change or no change. Blind. Most got most of the changes.