Mundorf M-Cap Supreme Silver/Gold/Oil 1200VDC – 2%tolerance
Technical Specifications (according to Mundorf):
"The MCap® Supreme Silver/gold/oil is the top-of-the line model of the Mundorf oil impregnated capacitors. In comparison with the Silver/Oil version, it technically features a further extended lifetime.
More importantly, sonically the Silver/Gold/Oil version stands out due to its wonderful natural singing and exceptional micro dynamic, at the same time."
Polyprophylene; Metallisation: 99.99% silver, 1% gold; Purity of silver: min. 99.97% typ. 99.99%; Purity of gold: min. 99.97% typ. 99.99%; Dielectric strengh: 1200V DC;
At this level we are talking about a serious capacitor, so my findings are relative to other exotic types. They are richer and better layered than the Mundorf Silver/Gold, they seem more open and more spatial.
Compared to the Duelund VSF copper they are not as well harmonically stuctured. The Duelund VSF copper capacitor creates smoother harmonics and a better midrange balance.
The Silver/Gold/Oil excels in image depth, call it "bowling alley depth"! In direct comparison the Duelund VSF copper sounds flatter.
Like the Mundorf Silver/Gold, the Silver/Gold/Oil has a slight top-end emphasis, this probably contributes to the perseived spatialness and micro-detailing.
It will depend on the implementation and personal taste, some may prefer the Mundorf Silver/Gold/Oil, some may prefer the Duelund VSF copper foil capacitor.