Well, completely shorting the capacitor out of the loop, gives a 4dB increase in SPL according to my radioshack spl meter at around 2500hz. And I can definatly hear that. But disconnecting and reconnecting the .33mfd film and foil capacitor (or even the original .47mfd) does nothing at the same frequency of 2500hz. I would assume that it would be attenuating by around 10 to 12dB at this frequency, but it isnt doing anything? The thing is, it sounds relativly flat up to around 16khz or so even without the cap...