paulears
Veteran
If you were screaming then you can't listen! forget all the maths and numbers. It really doesn't matter about the mic's sensitivity, that is what the gain control is for - so if it was me, I'd simply have said scream your loudest and watched the meters, into the red? turn down the preamp until with the fader at your usual working level, the meters are not going over scale. Once you are not generating distortion from being over level - you can go up and down a little on the fader if you wish - just practice setting it - but it is always ear and eye together. This is why in live sound we hit our pfl button which brings the channel up on the input meters and people talk or even shout into the mic while we set the preamp gain. Once our red lights go out, we nudge down a little extra - people always do it for real louder - then we have our channel fader to bring it in our out to suit.