Ed A wrote:

For you sound experts, I presume if a 3DB increase represents a perceived doubling of loudness does that mean a 10 DB decrease represents an approx 3 fold decrease in perceived loudness??

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Do not claim to be a noise expert, but did some measurements on the P&W jets over the years.  If you cut the noise 10 Db, I think that is 1/8 the perceived noise  (1/2X1/2X1/2= 1/8)

Bernie