I believe that Fruity Pebbles are actually somewhat higher in fiber leading to increased flatulance intermittantly raising your listening position for improved sonic perception.
If you want a sincere answer, yes they have a modest benefit. It is not of the magnitude of raising your cables off the floor or of using better power cords, but I will neither sell the pair I have nor buy anymore. Of course, like most tweaks, speakers, or cables I have only a plausible explanation for why they benefit the sound.
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