Originally Posted by kiwi2
What I do see written there that is relevant is... "This calculator does not account for room acoustics, amplifier dynamic headroom or off axis listening position
That's right. Why? Because it's much easier to provide a simple
calculator and expect the user to apply grey matter in determining irregularities specific to their system
In other words, here is what SPL you will reach with the power listed, and at the distance listed, in open air with a speaker that has a flat FR. This is absolutely the correct way to do things because it's not making wild guesses about your
or anyone elses
system that can be affected by any number of things.
I can use the calculator and apply adjustments specific
to my setup. I don't need to subtract adjustments made by some arbitrary guess for room gain or any other manner of wild guesses.
Amplifier dynamic headroom is the amps ability to supply power over and above
its rated power rating. So while your amp might produce 100w which you plug into a SPL calculator and gives you 101dB, it doesn't allow for any dynamic power available over and above this. Why? Because not all amps have the same dynamic headroom. Again, it's left to the reader to understand this is a basic calculator, and apply some grey matter
Same with off axis listening position. Speakers have different off axis response, to apply some arbitrary figure in a vain attempt to satisfy the needs of a user not able to apply grey matter is beyond stupid.
If you're looking at how things such as the above apply to your
system. Then you need to move past a simple SPL calculator. Study how each of these specific things effect SPL. Then you can return to the basic calculator and apply that knowledge to the output given by the calculator.
It boggles my mind that something as simple as an SPL calculator is causing so much confusion in a specific forum such as this!