Thanks for pointing that out Johnk. I noticed it too, but I am not use to thinking in logarithmic terms.
Edit: I need to learn to read more carefully. First tiem 'round I assumed they did the subtraction in the formula.
OK, I built the calculator in Excell (minus rounding 'cause I know how you audiophiles like accuracy
) and it works.
So, where do I plug in the room adjustment? Where the formula adjusts for headroom? Hmm... need a sound engineer's help here. Now where would we find one of those??
Edit: ok, I see how the formula works now. Add 5 to sensitivity or take 5 off of listener spl or headroom, its all the same.
Maybe I should stick to simpler things at this time of night like cleaning my tub.