The Amber Z-Cap (pure copper foil capacitor) was especially designed for the tweeter section of crossovers for passive hi-fi speakers. They are also excellent for mid-range application, but due to their price-point, Alumen Z-Caps will often be a more reasonably priced choice for mid-range application.
Compared to the Alumen Z-Caps, the Amber Z-Cap will offer an even more “neutral” presentation in the overall sound.
The sonic presentation of the Amber Z-Caps has that special warm, yet focused “flavour” that can only be achieved when using pure copper foil.
When we say “neutral”, we are referring to the focus being shifted from what can be a somewhat overemphasised brightness from a Super MKP capacitor, instead being replaced with a more even balance between the depth of the midrange and the presence of the tweeter.