Why not NP0/C0G caps?

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BrianL said:
All this points out the inherent danger in the audiophile "fetish" of blindly adding "better" bypass caps to commercial gear. But note that most of the so-called problems with "too good" caps is not in the audio band, but out at many MHz or many hundreds of MHz. Looking at various capacitor combinations on an HP/Agilent component analyzer is educational

Yes. And yes. But are you suggesting that ringing or oscillation tendencies at MHz frequencies is benign, just because it's 'not in the audio band' ?
 
No, I'm not suggesting that. The problem in the blind swapping done in so many audiophile tweaks is that the person doing it (whether a DIYer or a "professional" modifier) is that they generally don't have the ability to verify that their tweaks haven't caused some instability.

The saving grace is that most times nothing bad happens.
 
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