Not sure if anyone's mentioned it, but right up until after take off! the Propellers will be un synchrophased. The slight differences in RPM and Phase Angle will mean that the noise won't be steady but will tend to beat slightly and come and go. This doesn't enable the brain to exclude it or treat it as background noise so easily. Consequently it will seem to go on longer and be more annoying.
Miss the good old K, it must confuse the crap out of people that the J is "newer"
