LOL also...

But that twice as loud assumes that the sounds will 'sum'. If the argument that the sounds cannot subtract, then they
should be just as hard to sum....

--
Dan D.



..
"DJFawcett26" wrote in message ...
LOL - personally, I suspect if you use two pulse jets to cancel, all that will
happen is you will have a pulse jet twice as loud! But then again, I am not a
noise expert ..... well sort of I guess, I know how to make it.