how can such a small capacitor have such an impact ?
now also used as bypass in the treble branch (Mundorf MCap Supreme) of the same speakers. Already after soldering more natural sound.

can this capacitor make the difference ? I think yes - worth a try
as a bypass in a combination of different (capacitance and manufacturer) mid-woofer capacitors, it's like a missing piece had been added my speakers sound more convincing. Probably like most film/foil capacitors, these caps need a burn-in time.

More finesse
Used as bypass of a mkp decoupling capacitor in my little SET amp, gives more finesse in the highs and more spaciousness.

Amélioration à coût modéré
Excellent rapport qualité-prix pour ces condensateurs de découplage, recommandés par Tony Gee de "humblehomemadehifi". Précision, détails et nuances en progrès, sur condensateurs et haut-parleurs, de moyenne comme de haut de gamme.

Nice capacitors, interesting quality price ratio!!!
Very very nice capacitors at a very interesting price!!!