Signal direction:
All our capacitors are non-polarized audio grade capacitors.
This means that for our capacitors there is no “right” or “wrong” signal or connection direction.
It does not matter from which lead wire the signal enters and from which it exits.
Music is an AC signal, and it therefore makes no audible difference from which direction the music signal enters a non-polarized capacitor, an induction coil, or a resistor.
Signal direction only applies to polarized capacitors.
We have done in-house tests, and we have also have exchanged test results and feedback from listening tests with many of the world’s most acclaimed speaker designers.
Based on these tests and feedback, the broad consensus is that for non-polarized capacitors, induction coils and resistors, there is no audible difference that the human ear can detect, no matter from which direction the music signal enters.
Inner and outer foil:
Our Cross Caps and all our Z-cap series capacitors are wound uniformly, and the leads are connected to high-connectivity “end-discs” that are then connected to the whole rolled capacitor (the foil) itself.
There is therefor no “inner” or “outer” foil for all our Z-Cap capacitors and for the Cross Caps.