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Re: REFLECTOR: For those of you with High HP Shop Vacs read on
In a message dated 11/29/98 6:26:38 AM Pacific Standard Time,
> Another one of those engineered things that shouldn't work but does and
> you will surely love it if you want to keep your hearing.
> You can buy this Vac muffler at Home Depot near the shop vacuums.
Unless I'm mistaken, the chamber that you describe in you vacuum hose is
called a "Hemholz Chamber." I see them all the time on the intake systems of
cars. It acts to change the resonant frequency or something like that to keep
intake roar down...as you noted.