JohnK, I see what I did wrong in my examples, for the calculators to work correctly you would be using the average finding as the listening SPL value, I should be using 92-93db from my previous example, for the main listening SPL level; as the Dynamic Range is made up of the low and high on either side which then drops the required power output from the amp considerably.
I just had it in my head that while listening to Holsts': The Planets, the tracks are very quiet for a large portion of them but have large peaks, I found myself turning the volume up considerably to hear the quiet passages. This had me thinking of the lowest points of the range as the average(desired SPL on most calculators) listening level, which it really isn't.
It's late or early depending on your time frame, does this make sense?
