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Thanks again for the interest! I'm not sure how pressure relates to results. Could you further explain this? I've seen the Helmholtz resonator work on vehicle intakes before and in my experience they can be effective at a specific frequency. I think it can be frustrating if you try to tune...

I guess I should have included the equation I'm using: freq. = (speed of sound/2*Pie)*(area of a tube/(volume in the tube*length of the tube))^.5 This can also be found in wikipedia under helmholtz resonance.

Thanks everyone for the input! I agree that there are two noise components, one is structural through the body of my vehicle (this is an electric Mustang and we need the vacuum pump for the brake assist). and one is radiated through the sound wave which then sets off components around it...

I would like to be able to measure the frequency of a vacuum pump and then build a Helmholtz resonator to reduce the noise. Can anyone please help me with an inexpensive set-up to measure the noise and analyze it for frequency? Thanks!