The vh caps I have used and are pretty good the Pogota dac caps suck
it does prove a quality capacitor and resistor make a nice improvement .
i have been upgrading Loudspeaker components for years.
in Loudspeakers most a lower cost Solen or worse .
copper Foils are better in some respects , but the Odams buy matched to .05%
well worth it .i am helping a guy with his Xseries Borresen speakers ,which in another X speaker made a nice improvement ,they use the mid grade Jantzen.
the Jantzen AluminaZ aluminum foil are very good with top noth Path Audio resistors. VH audio Odams I highly recommend ,in loudspeakers 250v more then enough,they are nice and compact, cases are conductive, ask Chris to put a clear heat shrink on before purchasing them.