Vortex HiFi Power Cap Sigma explained Vortex HiFi Power Cap Sigma explained An explanation of the Power Cap Sigma will be published here shortly Power Cap Sigma with oscillation alignment Ground Optimizer 2 with Power CAP as an upgrade. Improve the sound of your Ground Optimizer with a Power CAP (white). AIO Power CAP as an upgrade for our Nano Shield Power Plugs AIO Power CAP for interference suppression of switching power supplies AIO Power CAP AIO Power CAP for optimal interference suppression of every power cable Here is an explanation of the Power Cap Sigma