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The average aircraft cabin is anywhere from 70-110db (louder behind the engines).
A friend recorded it at 90db on a 773 ER last week behind the engines.
Considering the maximum recommended exposure is 2 hours @ 90db - why isn't there outcry on the effect this has to our hearing?
I suggested to Qantas years ago they should do a deal with Bose and fit out the entire first/biz class cabin with noise cancelling tech, but it fell on deaf ears.