what is it that causes the mega dip around 300hz when i combine the response?
thanks
thanks
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
If the distance between the two sources is one half wave length apart (180 degrees) or any multiple of that (n*2pi+pi radians or n*360+180 degrees) then when the waves sum together the pressure is zero. Think adding +1 and -1 to get 0.
When they are in phase (accounting for distance at whatever frequency your talking about) it sums positively (louder) and when they are out of phase it cancels (quiet) and it varies inbetween. Also it will occur on a periodic basis as the frequency increases, this means it will happen not just at the fundamental frequency but also when n=2,3,4,5,6... this accounts for the periodic rise and fall above 300 on that graph.
I hope this makes sense
Last edited:
If the distance between the two sources is one half wave length apart (180 degrees) or any multiple of that (n*2pi+pi radians or n*360+180 degrees) then when the waves sum together the pressure is zero. Think adding +1 and -1 to get 0.
When they are in phase (accounting for distance at whatever frequency your talking about) it sums positively (louder) and when they are out of phase it cancels (quiet) and it varies inbetween. Also it will occur on a periodic basis as the frequency increases, this means it will happen not just at the fundamental frequency but also when n=2,3,4,5,6... this accounts for the periodic rise and fall above 300 on that graph.
I hope this makes sense
yes thanks.
these things are hard to make work properly!
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