I think a lot of this may be very dependent on the amount of RFI in your local environment. While I do not use the Cardas Caps, I do use shorting plugs, which are like RCA plugs where the hot and ground are soldered together, thus shorting the input (don't ever use these on an output). In the days of yore they were standard on Mac preamps and the like. In my environment, they absolutely make my preamp quieter, clearly and noticibly. Functionally, this is different from the Cardas product which simply covers the hot with the ground sheild.
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