Wayne Parham Messages: 18793 Registered: January 2001
Illuminati (33rd Degree)
Audience (Auricap) recommends connecting the outer plate as signal input to the capacitor, probably under the assumption that output impedance of a prior stage is lower than input impedance of the stage following. But I like your suggestion that outer plate goes to lowest impedance, regardless of signal direction. If you know which is the outer foil, it makes sense to tie it to the lower impedance connection, where it will act more as a shield.