...an increase in 10 means is an increase of 100% in perceived volume.

Take this for what it's worth... based only on what I have been told, with no schooling or scientific evidence to support it, I have heard that a 3 decibel increase results in a doubling of perceived volume. This is the rule of thumb that the SPL lunatics are using, with the the corolarry that doubling the output power of your amps will give you a three decibel gain. This I have observed for myself.

I am perfectly and humbly willing (and waiting!) to stand corrected here.

tanstaafl.

"There Ain't No Such Thing As A Free Lunch"