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GB: Round #5; Fo-Felix AC Filter

Not directly. We model a fair bit because real world variables are so high we can't really account for measuring in one setting being accurate for multiple settings.

Also we listen. A lot of filters sound horrible IMO. They measure ok on a 50-50ohm setting but that isn't very real world. They also don't account for resonances very often.
 
The Fo-Felix with any given CMC is higher filtration. Also the M5 is the only one in that PDF without Y caps, that often are a determent to sound with single ended operations.

I suspect those are better than the IEC inlet filters that sound awful.