Sorry to bring up the topic of the dreaded decibel again but I’m a bit stuck on the subject regarding amplifier power and volume (SPL).

I have been told that you need 10 times more power to double the volume of a speaker but I don’t quite understand why. I know ears work in a log scale but I can’t seem to link everything together.

Could anyone please help me out? A quick example and explanation would be great.

Thanks.