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Andreas we did do some freq ringing on the main FoH speakers and the monitors months aago. But today when i sang into one of the SM58 mics and did a freqency sweep (using iPad) with narrow Q and high dB i came accross at least 2 frequencies that whistled and i notched them down to around -3dB. But repeating the same on the other two SM58A mics gave feedback at different frequencies. Now what im concerned about with their tech guy adjusting the EQ on these mics is that say i leave as is and then i get asked to up the master FOH volume, that i could run into feedback issues with those frequencies raised up again….then who’d be blamed…
Maybe im getting too sensitive in my old age !!