Thanks Area51BS - I was totally wrong that 3 dB is a doubling of perceived intensity. I've had that misconception for decades (I think from an ancient Car & Driver article). I Googled after your comment, and yea - it's 10 dB like you say. And who knew there was a " Noise Abatement Society "?
http://www.sounddeadsteel.com/what-is-a-decibel.html#:~:text=An increase of 3dB doubles,a large increase in intensity.&text=The sound intensity multiplies by 10 with every 10dB increase.
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